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Rectangular Pool Volume Calculator

Estimate the total gallons of water in a rectangular pool, for chemical dosing and fill planning.

Computed in your browser — nothing you enter is uploaded. Figures are presented in United States units and terminology, and each formula’s basis is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax
33 ft16.5 ft5 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Estimated pool volume

20,360 gallons

High confidence

This assumes a rectangular pool with a uniform or simple-average depth — pools with a distinct shallow/deep slope or non-rectangular shapes (oval, kidney, round) need an adjusted formula for a precise figure.

Volume in cubic feet
2722.5 ft³

Running these inputs gives 20364 gallons as the estimated pool volume. Currently reading for United States — pick a different market above and the figures re-cast accordingly.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.

Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Regulatory standards & verification citations

  • Pool volume (gallons) = length x width x average depth (all in ft) x 7.48 gallons per cubic ft

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Why do I need to know pool volume?
Chemical dosing (chlorine, pH adjusters, algaecides) is calculated per gallon of water — using the correct volume is essential for safe, effective, and cost-efficient pool chemistry, since under- or over-dosing both cause problems.
How do I handle a pool with a sloped bottom?
Average the shallow-end and deep-end depths for a reasonable estimate, or for more precision, split the pool into a shallow rectangular section and a deep-end wedge/section and calculate each separately before adding them together.
Does this work for round or oval pools?
No — this is for rectangular pools only. A round pool's volume is calculated using the circle area formula (pi x radius²) instead, and oval pools need their own specific geometric formula.