Pool Volume Calculator

Calculate pool water volume in gallons for any pool shape. Get chemical dosing guides, fill time estimates, and water cost calculations.

Pool Shape

Standard rectangular or square pool

Pool Dimensions (feet)

Length

Width

Depth Type

Shallow End (ft)

Deep End (ft)

Average depth: 5.8 ft

Rectangular Pool Volume

Gallons

19,356

US gallons

Liters

73,270

metric

Cubic Feet

2,588

volume

Surface Area

450

sq ft

Pool shapeRectangular

Average depth5.8 ft

Surface area450 sq ft

Hose Flow Rate (gallons/min)

Typical garden hose: 9-17 GPM

Water Cost ($ per 1,000 gal)

US average: $3-$8 per 1,000 gallons

Fill Time & Water Cost

Estimated Fill Time

26h 53m

at 12 GPM (1,613 minutes total)

Estimated Water Cost

$106.46

19,356 gal @ $5.50/1,000 gal

Chemical Dosing Guide

Amounts for your 19,356 gallon pool. Always test water before adding chemicals.

Liquid Chlorine (12.5%)

Raise free chlorine 1 ppm

As needed (test 2-3x/week)

101fl oz

Chlorine Tablets (3")

Maintain 1-3 ppm free chlorine

Weekly in floater/feeder

4tablets/week

Shock Treatment (Cal-Hypo)

Super-chlorinate to 10 ppm

Weekly or after heavy use

1.9lbs

pH Decreaser (Sodium Bisulfate)

Lower pH by 0.2 points

As needed (target pH 7.2-7.6)

1.5lbs

pH Increaser (Soda Ash)

Raise pH by 0.2 points

As needed (target pH 7.2-7.6)

1.5lbs

Alkalinity Increaser (Baking Soda)

Raise alkalinity by 10 ppm

As needed (target 80-120 ppm)

2.9lbs

Algaecide (Standard)

Prevent algae growth

Weekly maintenance dose

31fl oz

Stabilizer (Cyanuric Acid)

Raise CYA by 10 ppm

Start of season (target 30-50 ppm)

2.9lbs

Important Safety Notes:

Never mix chemicals together before adding to pool
Add chemicals with pump running for proper circulation
Wait 20 minutes between different chemical additions
Test water before and after adjustments

Common Pool Sizes Reference

Pool Size	Surface (sq ft)	Gallons (5ft avg)	Category
12' x 24'	288	10,772	Small
15' x 30'	450	16,831	Medium
16' x 32'	512	19,150	Medium
18' x 36'	648	24,237	Large
20' x 40'	800	29,922	Large
18' round	254	7,600	Above Ground
24' round	452	13,525	Above Ground

1 cubic foot = 7.48 gallons. Kidney and freeform pools use an 0.85 multiplier for their irregular shape.

How to Use Pool Volume Calculator

1Select pool shape
2Enter dimensions and depths
3View gallons and chemical needs
4Estimate fill time and water cost

Frequently Asked Questions

How many gallons is my pool?▾

Rectangular: L × W × Avg Depth × 7.5. Circular: Diameter² × Avg Depth × 5.9. Oval: L × W × Avg Depth × 5.9. Kidney: multiply rectangular formula by 0.85.

How long does it take to fill a pool?▾

A garden hose flows about 9 GPM. A 15,000-gallon pool takes about 28 hours to fill. Using two hoses cuts time in half. City water trucks can deliver 6,000 gallons at once.

How much chlorine does my pool need?▾

Maintain 1-3 ppm free chlorine. For initial treatment, add 2 oz of liquid chlorine per 1,000 gallons. Shock treatment uses 1 lb of calcium hypochlorite per 10,000 gallons.

About Pool Volume Calculator

Calculate pool water volume in gallons for any pool shape. Get chemical dosing guides, fill time estimates, and water cost calculations.

NexTool's Pool Volume Calculator is completely free to use with no sign-up required. Your data is processed directly in your browser and never sent to our servers, ensuring complete privacy and instant results.