Calculators

Free online calculators for finance, health, math, and lifestyle. From mortgage and loan calculators to BMI and calorie counters -- get instant, accurate results.

181 tools available

No sign-up · No data sent to servers · Instant results

BMI Calculator

Calculate your Body Mass Index with visual BMI scale

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Loan Calculator

Calculate monthly payments, interest, and amortization schedules

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Compound Interest Calculator

Calculate compound interest with contributions and visual growth chart

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Tip Calculator

Calculate tips, split bills, and round totals with tipping guide

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Mortgage Calculator

Calculate mortgage payments with taxes, insurance, PMI, and amortization

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Calorie Calculator

Calculate daily calories (TDEE/BMR) with macro breakdowns for your goals

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Salary Calculator

Convert salary between hourly, weekly, monthly, and annual with tax estimates

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Discount Calculator

Calculate sale prices, savings, and stack multiple discounts

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GPA Calculator

Calculate semester and cumulative GPA with course management

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Fuel Cost Calculator

Calculate trip fuel costs, annual expenses, and CO2 emissions

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Square Footage Calculator

Calculate area for rectangles, circles, triangles, and rooms with cost estimates

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Income Tax Calculator

Estimate US federal income tax with brackets, FICA, and take-home pay

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Retirement Calculator

Estimate retirement savings, income, and how much to save monthly

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Hourly to Salary Calculator

Convert hourly wage to annual salary with tax estimates and overtime

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Electricity Cost Calculator

Calculate electricity costs for appliances with daily, monthly, and yearly estimates

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Savings Goal Calculator

Calculate how long to reach your savings goal or how much to save monthly

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Pregnancy Due Date Calculator

Calculate pregnancy due date, trimester timeline, and development milestones

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Grade Calculator

Calculate weighted grades, GPA, and what you need on finals

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Paycheck Calculator

Calculate take-home pay with federal tax, FICA, state tax, and deductions

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Running Pace Calculator

Calculate running pace, finish time, or distance with split times

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ROI Calculator

Calculate return on investment, annualized ROI, and compare investments

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Auto Loan Calculator

Calculate monthly car payments, total interest, and amortization

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Debt Payoff Calculator

Calculate how long to pay off debt with avalanche or snowball strategies

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Body Fat Calculator

Estimate body fat percentage using the US Navy method and BMI formula

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Net Worth Calculator

Calculate your total net worth from assets minus liabilities

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Inflation Calculator

Calculate how inflation affects purchasing power over time

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BAC Calculator

Estimate blood alcohol content based on drinks, weight, and time

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Scientific Calculator

Full-featured scientific calculator with trig, log, and memory functions

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Investment Calculator

Calculate investment growth with monthly contributions and dividends

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Tax Bracket Calculator

See which tax brackets your income falls into with effective rate

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Water Intake Calculator

Calculate your recommended daily water intake based on weight and activity

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Due Date Calculator

Calculate pregnancy due date or project deadline with timeline

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Rent Affordability Calculator

Determine how much rent you can afford based on income

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Macro Calculator

Calculate daily protein, carbs, and fat needs for your fitness goal

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CAGR Calculator

Calculate compound annual growth rate for investments

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Profit Margin Calculator

Calculate gross and net profit margins with markup comparison

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Ideal Weight Calculator

Calculate ideal body weight using Devine, Robinson, Miller, and Hamwi formulas

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Wedding Budget Calculator

Plan your wedding budget with category allocations, per-guest costs, and expense tracking

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Dog Age Calculator

Convert your dog's age to human years using the latest veterinary science formulas

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Car Affordability Calculator

Find out how much car you can afford based on your income, expenses, and credit score

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Student Loan Calculator

Calculate student loan payments with Standard, Graduated, and Income-Driven repayment plans

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Carbon Footprint Calculator

Calculate your annual carbon footprint from transportation, home energy, diet, and consumption

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Moving Cost Calculator

Estimate your moving costs with DIY, hybrid, and full-service comparisons plus a moving checklist

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Party Food Calculator

Calculate exactly how much food and drinks you need for your party based on guests and duration

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Stock Return Calculator

Calculate stock investment returns including dividends, capital gains, and after-tax performance

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Home Affordability Calculator

Calculate how much house you can afford based on income, debts, and down payment using the 28/36 rule

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Business Loan Calculator

Calculate business loan payments for Term Loans, SBA 7(a), Lines of Credit, and Equipment Financing

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401(k) Calculator

Project your 401(k) retirement savings with employer matching, catch-up contributions, and growth analysis

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Protein Calculator

Calculate your optimal daily protein intake based on weight, activity level, and fitness goals

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Rent vs Buy Calculator

Compare the financial impact of renting vs buying a home over time with net worth projections

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Heart Rate Zone Calculator

Calculate your target heart rate zones for optimal training using the Karvonen formula

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Tax Withholding Calculator

Calculate federal tax withholding per paycheck and estimate your refund or amount owed

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EMI Calculator

Calculate Equated Monthly Installments for any loan with amortization schedule and prepayment analysis

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Payroll Tax Calculator

Calculate federal, state, Social Security, and Medicare taxes with detailed net pay breakdown

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Savings Interest Calculator

Calculate savings account growth with compound interest, APY comparison, and inflation-adjusted projections

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Property Tax Calculator

Calculate property taxes with exemptions and multi-year projections

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Sales Tax Calculator

Calculate sales tax for any US state with multi-item and reverse modes

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DCA Calculator

Calculate dollar-cost averaging returns with DCA vs lump sum comparison

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One Rep Max Calculator

Calculate your one-rep max using 7 proven strength formulas

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Credit Score Simulator

Simulate how financial actions like paying debt or opening accounts affect your credit score

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Amortization Calculator

Generate detailed loan amortization schedules showing principal, interest, and balance for each payment

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Debt-to-Income Calculator

Calculate your debt-to-income ratio to understand your borrowing capacity and financial health

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Down Payment Calculator

Calculate how much to save for a down payment and see how it affects your mortgage payments and PMI

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APR Calculator

Calculate the true Annual Percentage Rate including fees, points, and closing costs for any loan

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Break-Even Calculator

Calculate the break-even point for your business showing units needed and revenue required to cover costs

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Social Security Calculator

Estimate your Social Security retirement benefits based on earnings history and claiming age

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CD Calculator

Calculate Certificate of Deposit returns with compound interest and compare CD laddering strategies

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Crypto Profit Calculator

Calculate cryptocurrency investment returns, profits, and ROI including fees and tax estimates

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TDEE Calculator

Calculate your Total Daily Energy Expenditure based on BMR, activity level, and body composition

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Blood Pressure Calculator

Track and categorize blood pressure readings with averages, trends, and health risk indicators

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Ovulation Calculator

Track your fertile window and ovulation date based on your menstrual cycle for family planning

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Pregnancy Weight Gain Calculator

Track recommended pregnancy weight gain by trimester based on pre-pregnancy BMI guidelines

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Waist-to-Hip Ratio Calculator

Calculate your waist-to-hip ratio and assess your health risk level for cardiovascular disease

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Fraction Calculator

Add, subtract, multiply, and divide fractions with step-by-step solutions and simplification

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Matrix Calculator

Perform matrix operations including addition, multiplication, determinant, inverse, and transpose

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Binary Calculator

Perform binary arithmetic operations and convert between binary, decimal, octal, and hexadecimal

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Net Income Calculator

Calculate your net income after federal, state, and local taxes with detailed deduction breakdown

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Margin Calculator

Calculate profit margin, markup, and selling price with batch analysis and industry benchmarks

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Payoff Calculator

Calculate how fast you can pay off debt with extra payments and see total interest savings

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Conversion Rate Calculator

Calculate website conversion rates, run A/B test analysis, and project revenue growth

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Electricity Usage Calculator

Calculate electricity costs by appliance with presets for 38 common devices and energy saving tips

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Stock Screener

Screen 50 stocks by fundamentals, track your portfolio, and learn investment strategies

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Lease Calculator

Calculate car and equipment lease payments with lease vs buy comparison

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Tip Split Calculator

Calculate tips and split bills between groups with rounding and tax options

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Paint Calculator

Calculate paint needed for rooms with coverage estimates and cost breakdown

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Concrete Calculator

Calculate concrete volume in cubic yards for slabs, columns, and walls with bag estimates

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Fence Calculator

Calculate fence materials and costs for privacy, picket, split rail, and chain link fences

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Tile Calculator

Calculate tiles needed for floors and walls with waste factor and pattern adjustments

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Mulch Calculator

Calculate mulch needed in cubic yards and bags with bulk vs bag cost comparison

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Soil Calculator

Calculate soil volume for garden beds and raised beds with mix recommendations

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Wedding Guest Calculator

Track wedding RSVPs, meal selections, table assignments, and per-guest budget

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Pool Volume Calculator

Calculate pool water volume in gallons for chemical dosing, fill time, and cost estimates

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Lawn Care Calculator

Calculate fertilizer, seed, and water needs for your lawn based on size and grass type

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Firewood Calculator

Calculate cords of firewood needed for winter heating with BTU estimates and cost comparison

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Wallpaper Calculator

Calculate wallpaper rolls needed with pattern repeat waste and cost estimates

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Deck Cost Calculator

Estimate deck building costs with materials, features, and labor breakdown

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Moving Budget Calculator

Calculate moving costs with professional vs DIY comparison and supply estimates

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Pet Food Calculator

Calculate daily pet food portions for dogs and cats based on weight, age, and activity

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Rain Barrel Calculator

Calculate rainwater collection potential from roof area with savings and garden coverage

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Gravel Calculator

Calculate gravel needed in tons and cubic yards for driveways, paths, and landscaping

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Stair Calculator

Calculate stair dimensions per building code with riser height, tread depth, and stringer length

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Brick Calculator

Calculate bricks needed for walls, patios, and columns with mortar and cost estimates

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Insulation Calculator

Calculate insulation needs by R-value with material comparison and energy savings estimates

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Gutter Calculator

Calculate gutter materials, downspouts, and accessories with cost estimates by material

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Drywall Calculator

Calculate drywall sheets, joint compound, tape, and screws needed for walls and ceilings

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Flooring Calculator

Calculate flooring materials for hardwood, laminate, tile, vinyl, and carpet with cost estimates

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Window Cost Calculator

Estimate window replacement costs by type, frame material, glass, and size

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HVAC Calculator

Calculate HVAC system sizing (BTU/tonnage) and cost by climate zone and home size

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Solar Panel Calculator

Estimate solar panel system size, cost, savings, and payback period for your home

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Water Heater Calculator

Calculate water heater sizing and compare 6 types by operating cost and 10-year ownership cost

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Fence Paint Calculator

Calculate paint and stain needed for fences with coverage rates and cost estimates

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Roof Calculator

Calculate roofing materials, squares, and cost by material type and roof pitch

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Siding Calculator

Calculate siding materials for house exterior with 6 material options and cost comparison

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Carpet Calculator

Calculate carpet for multiple rooms with roll width optimization and padding costs

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Kitchen Remodel Calculator

Estimate kitchen renovation costs with scope selection and ROI analysis

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Bathroom Remodel Calculator

Estimate bathroom renovation costs by size, scope, and remodel level with ROI analysis

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Tire Size Calculator

Compare tire sizes with diameter difference, speedometer error, and clearance changes

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Gas Mileage Calculator

Calculate fuel costs, MPG, and annual gas expenses with EV cost comparison

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College Savings Calculator

Calculate 529 plan savings needed for college with growth projections and gap analysis

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Home Equity Calculator

Calculate home equity, HELOC borrowing power, and loan payment estimates

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Asphalt Calculator

Calculate asphalt tonnage and cost for driveways and parking lots

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Pool Chemical Calculator

Calculate pool chemical dosages for chlorine, pH, alkalinity, and CYA adjustments

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Land Clearing Calculator

Estimate land clearing costs by acreage, terrain type, and vegetation density.

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Concrete Slab Calculator

Calculate concrete volume, bags needed, and project cost for slabs and pads.

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Home Insurance Calculator

Estimate annual homeowners insurance premium based on home value and coverage.

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Paint Room Calculator

Calculate how much paint you need for a room including walls, ceiling, and supplies.

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Electric Car Savings Calculator

Compare EV vs gas car fuel costs and see annual savings with CO2 reduction.

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RV Loan Calculator

Calculate monthly RV loan payments with term comparison and total interest.

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Boat Loan Calculator

Calculate boat loan payments and total ownership costs including insurance and storage.

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Fence Cost Calculator

Estimate fence installation cost by type, length, height, and number of gates.

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Lawn Mowing Calculator

Calculate lawn mowing time and cost with DIY vs professional comparison.

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Appliance Energy Calculator

Calculate energy costs for household appliances with daily, monthly, and annual estimates.

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Credit Card Payoff Calculator

Calculate how long to pay off credit card debt and how much interest you'll pay

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Stamp Duty Calculator

Calculate real estate transfer taxes, title insurance, and closing costs by state

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Health Insurance Calculator

Compare health insurance plan costs and find the best option

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Car Insurance Calculator

Estimate car insurance premiums by driver profile and coverage

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Renters Insurance Calculator

Calculate renters insurance coverage needs and monthly cost

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Alimony Calculator

Estimate spousal support payments and duration

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Divorce Settlement Calculator

Calculate fair asset division in a divorce

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Personal Injury Calculator

Estimate personal injury settlement value

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Cap Rate Calculator

Calculate capitalization rate for real estate investments

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Rental Yield Calculator

Calculate gross and net rental yield on investment property

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House Flip Calculator

Calculate profit and ROI on a house flip project

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Airbnb Calculator

Estimate Airbnb rental income and profitability

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Debt Consolidation Calculator

Compare current debts vs a consolidation loan

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Balance Transfer Calculator

Calculate savings from a credit card balance transfer

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HELOC Calculator

Calculate home equity line of credit payments and limits

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Personal Loan Calculator

Calculate personal loan payments and total interest

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Capital Gains Calculator

Calculate capital gains tax on investments and property

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Self-Employment Tax Calculator

Calculate self-employment tax and quarterly estimated payments

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Estate Tax Calculator

Estimate federal and state estate tax on an inheritance

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Crypto Tax Calculator

Calculate cryptocurrency taxes on trades and transactions

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Freelance Rate Calculator

Calculate your ideal freelance hourly and project rates

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SaaS Metrics Calculator

Calculate key SaaS business metrics: MRR, ARR, LTV, CAC

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Annuity Calculator

Calculate annuity growth and payout projections for accumulation and distribution phases

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Child Support Calculator

Estimate child support payments using income shares and percentage of income models

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Closing Cost Calculator

Estimate home closing costs by state including lender fees, title insurance, and prepaid items

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Keto Calculator

Calculate personalized keto macros for fat, protein, and net carbs based on your goals and activity level

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Life Insurance Calculator

Calculate life insurance coverage needs based on income, debts, dependents, and existing assets

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Refinance Calculator

Compare current vs refinanced mortgage payments, total savings, and break-even point for closing costs

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Startup Cost Calculator

Estimate startup costs by business type with categorized expenses, runway planning, and funding gap analysis

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FIRE Calculator

Calculate your Financial Independence, Retire Early (FIRE) number with Lean, Regular, and Fat FIRE variants, savings projections, and milestone timeline

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LLC vs S-Corp Calculator

Compare LLC vs S-Corp tax savings with side-by-side analysis, self-employment tax breakdown, and optimal salary sensitivity chart

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Amazon FBA Calculator

Calculate Amazon FBA fees, profit margins, and ROI across 15 product categories with size tier breakdowns and price sensitivity analysis

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Quarterly Tax Calculator

Calculate quarterly estimated tax payments with federal + state taxes, safe harbor rules, and payment deadlines for all 50 US states

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Cost of Living Calculator

Compare cost of living between 50+ US cities across housing, food, transportation, healthcare, and utilities with salary adjustment recommendations

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AI Token Calculator

Calculate AI API costs across 16+ models (GPT-4o, Claude, Gemini, Llama) with token estimation, batch pricing, and monthly budget projections

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Etsy Fee Calculator

Calculate Etsy seller fees including listing, transaction, payment processing, and offsite ad fees with profit margin analysis

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Roth IRA Conversion Calculator

Analyze Roth IRA conversion strategies with break-even year calculation, tax impact analysis, and optimal conversion amount recommendations

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Workers Comp Calculator

Estimate workers compensation insurance premiums by state with industry classification codes, experience modification rates, and coverage analysis

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Calories Burned Calculator

Calculate calories burned across 95+ activities organized in 9 categories using MET values, with heart rate zone estimation and weekly planning

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Dividend Calculator

Calculate dividend income with DRIP reinvestment, yield on cost tracking, dividend growth projections, and compound growth visualization

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Shopify Profit Calculator

Calculate Shopify store profitability across 4 plan tiers with payment processing fees, shipping costs, and break-even analysis

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Disability Benefits Calculator

Estimate SSDI (Social Security Disability Insurance) benefits using PIA formula with 2024 bend points, work credit eligibility, and family benefits

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eBay Fee Calculator

Calculate eBay seller fees across 14 categories and 5 store tiers including insertion, final value, promoted listings, and international fees

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Stock Options Calculator

Calculate stock option values for ISO, NSO, and RSU grants with AMT exposure analysis, vesting timeline, and exercise strategy comparison

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A1C Calculator

Convert between A1C and average blood sugar levels with color-coded diabetes risk ranges, reference charts, and bidirectional conversion

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Intermittent Fasting Calculator

Plan your intermittent fasting schedule with 6 protocols (16:8, 18:6, 20:4, OMAD, 5:2, ADF), eating window visualization, and macro targets

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Crypto Mining Calculator

Calculate cryptocurrency mining profitability for 5 coins (BTC, ETH, LTC, DOGE, XMR) with electricity costs, ROI timeline, and break-even analysis

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Business Valuation Calculator

Estimate business value using 3 methods: Revenue Multiple, EBITDA Multiple, and Discounted Cash Flow (DCF) with industry-specific multipliers

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IVF Cost Calculator

Estimate IVF treatment costs across 4 US regions with component breakdowns, multi-cycle projections, and insurance coverage analysis

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Frequently Asked Questions

What calculators are available on NexTool?

NexTool offers 40+ free calculators covering finance (mortgage, loan, compound interest, ROI), health (BMI, calorie, body fat), math (percentage, GPA), and lifestyle (tip, age, retirement). All calculations are instant and private.

How accurate are the financial calculators?

Our financial calculators use industry-standard formulas and up-to-date tax brackets. They provide reliable estimates for planning purposes, though we recommend consulting a financial advisor for major decisions.

Do I need to create an account to use the calculators?

No. All calculators are free to use with no sign-up, no login, and no data collection. Your calculations are processed entirely in your browser.