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Plunge Pool Volume Calculator

Plunge pools are small and deep, which makes dosing unforgiving. A cup of chlorine that is fine in a full size pool can spike a plunge pool, so get the volume right first.

Plunge Pool pool with the measurements needed for a volume calculation

Calculate your plunge pool pool volume

1. Pick your pool shape

A small, deep rectangular pool built for cooling off rather than swimming.

2. Enter your measurements

Measure in feet or meters. You always get gallons and litres back.

3. Set your depth

This shape normally has a flat floor, so one water depth is enough.

Measure to the water line, not the top of the wall.

Your pool volume result

Pool volume

2,513 gallons

9,514 litres

Cubic feet
336 cu ft
Cubic metres
9.5 m3
Surface area
84 sq ft
Average depth
4.00 ft
Pool shape
Plunge Pool
How we calculated this

Shape: Plunge Pool. Dimensions used: Length 12 ft, Width 7 ft. Depth: 4 ft throughout. Formula: Volume = length x width x depth. Conversion: cubic feet x 7.48 = US gallons, gallons x 3.785 = litres, cubic feet x 0.0283 = cubic metres.

How the plunge pool volume calculator works

Multiply length by width for the surface area, then by the water depth. Plunge pools normally have a flat floor, so a single depth reading works.

Multiply cubic feet by 7.48 for US gallons. Metric users can read litres and cubic metres straight from the results.

The formula

Volume = length x width x depth

Measure: Length, width, depth.

Worked example

A 12 by 7 foot plunge pool covers 84 square feet. With 4.5 feet of water that is 378 cubic feet.

That comes to about 2,828 gallons, or 10,700 litres.

Tips before you measure

Halve any dose instructions written for 10,000 gallon pools before you pour, then test and adjust.

Bench seats displace water. Subtract their footprint at seat depth if you want a tighter figure.

Plunge Pool pool volume FAQs

How many gallons is a typical plunge pool?

Most sit between 2,000 and 4,000 gallons. A 12 by 7 foot pool at 4.5 feet holds around 2,828 gallons.

Why does small volume matter for chemicals?

Doses scale with water. In a small pool a standard scoop of shock can push chlorine far past safe swimming levels.

Does a spa jet bench count?

Subtract the seat area at its own depth. It usually removes 100 to 200 gallons.

Other pool shapes

Not quite the right outline? The main pool volume calculator covers all 20 shapes with the same units and formulas.