How many gallons in a 16 × 32 pool?

With a 3.5 ft shallow end and 8 ft deep end, about 22,000 gallons. Every foot of average depth in that pool is about 3,830 gallons.

How do I get the average depth?

Add the shallow-end and deep-end depths and divide by two. That is exact for a straight slope; if the deep end is a hopper, measure the depth at a few points and average them.

Why does the kidney shape use 0.75?

A kidney pool covers roughly three-quarters of the rectangle that encloses it. It is the industry's estimating figure, close enough for chemicals; for a fill-up bill read the meter.

Pool volume calculator

Form 92 · Materials estimateFigures checked 2026-09-04

US customary

Measurements

Shape

Length(ft)

Width(ft)

Shallow end depth(ft)

Deep end depth(ft)Same as shallow for a flat-bottom pool

What you need

Quantity · Amount

01Surface arealength × width512 sq ft
02Average depth(3.5 + 8) ÷ 25.75 ft
03Volume2,944 cu ft
04Gallons7.48 gal per cu ft22,023 gal
05Fill-up at your water rate$6 per 1,000 gal22$132

Water to fill$132

Chemical doses are usually stated per 10,000 gallons; divide the gallons line by 10,000 for the multiplier.

Prices — put in what you were quoted

Water rate($ per each)Per 1,000 gallons; US rates are typically $3–10

Water to fill22,023 gallons$132

Where these figures come from

7.48052 US gallons per cubic foot by definition.
Kidney factor 0.75 and oval as an ellipse: the pool trade's estimating rules.
Water rates vary by utility; the default is a placeholder.

Chemical doses, pump sizing and a fill-up bill all start from the gallons. Pick the shape, type the length and width (or the diameter), and the shallow and deep-end depths; the sheet averages the depth, converts to gallons and liters, and estimates the water bill at a rate you can edit.

Worked examples

Rectangle 32 × 16 ft, 3.5 to 8 ft: 22,023 gal — gallons, about $132 Water to fill.
Round above-ground 24 ft, 4 ft flat: 13,536 gal — gallons, about $81 Water to fill.

How it is worked out

Surface area by shape (rectangle L × W; round π r²; oval π × L/2 × W/2; kidney L × W × 0.75) × average depth = cubic feet. Gallons = cubic feet × 7.48. Liters = gallons × 3.785. Cost = gallons ÷ 1,000 × the rate.

The figures behind it

7.48052 US gallons per cubic foot by definition.
Kidney factor 0.75 and oval as an ellipse: the pool trade's estimating rules.
Water rates vary by utility; the default is a placeholder.

Every figure here is an estimate. Materials vary with moisture, compaction and product; order a little extra and confirm quantities with your supplier.

Questions people ask

How many gallons in a 16 × 32 pool?: With a 3.5 ft shallow end and 8 ft deep end, about 22,000 gallons. Every foot of average depth in that pool is about 3,830 gallons.
How do I get the average depth?: Add the shallow-end and deep-end depths and divide by two. That is exact for a straight slope; if the deep end is a hopper, measure the depth at a few points and average them.
Why does the kidney shape use 0.75?: A kidney pool covers roughly three-quarters of the rectangle that encloses it. It is the industry's estimating figure, close enough for chemicals; for a fill-up bill read the meter.

Embed this calculator

Paste this anywhere HTML is allowed. Free; keep the credit link.

<iframe src="https://getyardmath.com/embed/pool-volume-calculator" width="100%" height="900" loading="lazy" title="Pool volume calculator"></iframe>
<p><a href="https://getyardmath.com/pool-volume-calculator">Pool volume calculator</a> by YardMath</p>