How many gallons are in my pool?

Work out the volume in cubic feet and multiply by 7.48 (US gallons in a cubic foot). A rectangle is length × width × average depth; a round pool is 3.1416 × radius² × depth; an oval is 0.785 × length × width × depth. A 32 × 16 ft pool running 3.5 ft to 8 ft deep averages 5.75 ft and holds about 22,000 gallons.

How do I measure the depth of a pool with a deep end?

Measure the water depth — not the wall height — at the shallow end and at the deep end, and average them. That is exact for a floor that slopes evenly. A hopper-style deep end with a steep drop holds a little more than the average suggests, so treat the result as the floor of your estimate when dosing chemicals.

How many litres is a cubic metre?

Exactly 1,000. A 10 × 5 m pool averaging 1.75 m deep is 87.5 m³, which is 87,500 litres. That is the figure chemical labels dose against in metric countries.

How long will it take to fill?

Volume divided by the flow. A garden hose typically delivers somewhere around 5–10 gallons (20–40 litres) a minute depending on pressure and hose size; time a bucket to know yours, then type it in. 22,000 gallons at 10 gpm is 2,200 minutes — about a day and a half.

Pool volume calculator

Forme de la piscine

Longueur

Largeur

Hauteur d’eau, côté peu profond

Hauteur d’eau, côté profond

Débit d’eau (facultatif)

gpm

Chronométrez un seau rempli au boyau d’arrosage — le débit varie beaucoup.

— gallons US

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Voir le calcul — avec vos chiffres

Rectangle, circle and ellipse arithmetic on the sizes you type, with a straight-line average for a sloping floor. Steps, benches, a hopper deep end and rounded corners all change the real figure a little — check chemical doses against the product label.

Pick the shape, type the inside size and the water depth at each end, and the tool gives the water the pool holds in US gallons and cubic feet — or litres and cubic metres — with the fill time at the flow you enter.

Exemple détaillé

Imperial: a 32 × 16 ft pool, 3.5 ft of water at the shallow end and 8 ft at the deep end. Average depth (3.5 + 8) ÷ 2 = 5.75 ft. Volume 32 × 16 × 5.75 = 2,944 ft³, × 7.48 = about 22,020 gallons. At 10 gpm it takes about 2,200 minutes to fill — roughly 37 hours.

Metric: a 10 × 5 m pool, 1.1 m to 2.4 m deep. Average 1.75 m, volume 10 × 5 × 1.75 = 87.5 m³ = 87,500 litres. At 40 L/min the fill takes about 2,190 minutes, a little over 36 hours.

Sur le chantier

Round above-ground pools. A 24 ft round with 4 ft of water: 3.1416 × 12² × 4 = 1,810 ft³, about 13,540 gallons. A 7.3 m round with 1.2 m of water is 3.1416 × 3.65² × 1.2 ≈ 50.2 m³ — just over 50,000 litres. The wall height is not the water depth; use the waterline.

Order water by the load. Trucked water comes in tanker loads — divide the volume by the truck's capacity and round up, and make sure the truck can reach the pool before you book it.

Dose against the right number. Chemical labels are written per 10,000 gallons or per 10 m³. Rounding your pool up a little is safer than dosing a 22,000-gallon pool as if it were 30,000.

Quick referencefor pools

Gallons in a cubic foot: 7,48 US gal
Litres in a cubic metre: 1 000 L
US gallon: 3.785 L · a litre is 0.264 gal
Round pool: 3.1416 × radius² × depth
Oval pool: 0.785 × length × width × depth
Fill time: volume ÷ flow — 10,000 gal at 10 gpm is 1,000 min (16.7 h)

La formule

volume = floor area × (shallow depth + deep depth) ÷ 2

Floor area is length × width for a rectangle, π × r² for a round pool and π ÷ 4 × length × width for an oval. Then cubic feet × 7.48 is US gallons; cubic metres × 1,000 is litres.

Questions

How many gallons are in my pool?: Work out the volume in cubic feet and multiply by 7.48 (US gallons in a cubic foot). A rectangle is length × width × average depth; a round pool is 3.1416 × radius² × depth; an oval is 0.785 × length × width × depth. A 32 × 16 ft pool running 3.5 ft to 8 ft deep averages 5.75 ft and holds about 22,000 gallons.
How do I measure the depth of a pool with a deep end?: Measure the water depth — not the wall height — at the shallow end and at the deep end, and average them. That is exact for a floor that slopes evenly. A hopper-style deep end with a steep drop holds a little more than the average suggests, so treat the result as the floor of your estimate when dosing chemicals.
How many litres is a cubic metre?: Exactly 1,000. A 10 × 5 m pool averaging 1.75 m deep is 87.5 m³, which is 87,500 litres. That is the figure chemical labels dose against in metric countries.
How long will it take to fill?: Volume divided by the flow. A garden hose typically delivers somewhere around 5–10 gallons (20–40 litres) a minute depending on pressure and hose size; time a bucket to know yours, then type it in. 22,000 gallons at 10 gpm is 2,200 minutes — about a day and a half.

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