Train clients with precision — calculate BMI, body fat, macros, TDEE, one-rep max, heart rate zones, and ideal weight. All free, instant, and runs in your browser.
No sign-up · No data sent to servers · Instant results
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Calculate website conversion rates, run A/B test analysis, and project revenue growth
Use tool →Calculate percentages, increases, decreases, and changes
Use tool →Calculate your Body Mass Index with visual BMI scale
Use tool →Estimate body fat percentage using the US Navy method and BMI formula
Use tool →Calculate daily calories (TDEE/BMR) with macro breakdowns for your goals
Use tool →Calculate calories burned across 95+ activities organized in 9 categories using MET values, with heart rate zone estimation and weekly planning
Use tool →Calculate your target heart rate zones for optimal training using the Karvonen formula
Use tool →Calculate ideal body weight using Devine, Robinson, Miller, and Hamwi formulas
Use tool →Calculate daily protein, carbs, and fat needs for your fitness goal
Use tool →Calculate your Basal Metabolic Rate and Total Daily Energy Expenditure
Use tool →Calculate your optimal daily protein intake based on weight, activity level, and fitness goals
Use tool →Calculate your Total Daily Energy Expenditure based on BMR, activity level, and body composition
Use tool →Learn how to calculate your Body Mass Index (BMI) with the simple formula. Understand what your BMI means, its limitations, and when to use other health metrics.
Read guide →Learn how to calculate your Total Daily Energy Expenditure (TDEE) and create a calorie deficit for healthy weight loss. Includes formulas, activity multipliers, and a free calculator.
Read guide →Learn 5 different methods to calculate body fat percentage, from the free US Navy method to DEXA scans. Understand what your body fat percentage means for health.
Read guide →Learn the 50/30/20 budgeting rule: 50% needs, 30% wants, 20% savings. Includes practical examples, adjustments for different incomes, and free calculators.
Read guide →NexTool provides a complete fitness trainer toolkit: BMI calculators, body fat estimators, macro nutrient splitters, TDEE calculators, one-rep max estimators, target heart rate zone finders, protein intake calculators, calorie counters, and ideal weight calculators.
Absolutely. All tools work on phones and tablets with instant results. Calculate client BMI, body fat percentage, TDEE, and macro targets during initial assessments and progress check-ins.
Start with the TDEE calculator to find maintenance calories, then use the macro calculator to split into protein, carbs, and fat. Our protein calculator provides specific daily protein targets based on activity level and goals.
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