Pool & spa
Pool Gallon Calculator
How many gallons a pool holds, from its dimensions and the slope of its floor.
Result
Figures are US gallons unless the imperial line is used. Water weighs 8.34 pounds per US gallon, which adds up quickly on even a modest pool.
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About this calculator
US or imperial gallons?
Pool chemistry in North America is always US gallons. An imperial gallon is about 20% larger, so mixing the two produces a 20% dosing error.
How accurate does this need to be?
Within about 5%. Beyond that, chemical doses start drifting far enough to matter over a season.
The formula
gallons = length x width x average depth x 7.48
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