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Pool & spa

Pool Water Calculator

How long a pool takes to fill, and what the water costs.

Your numbers

A garden hose is roughly 8 to 12 GPM.
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Result

Time to fill 37.0 Hours
Cost to fill $90
Top-up water per month 800 Gallons
Top-up cost per month $3.60
About 37.0 hours to fill, costing $90. Evaporation and splash-out then take roughly 800 gallons a month.

Evaporation varies enormously with climate, wind, whether the pool is heated and whether it is covered. A cover cuts it by half or more. Losing noticeably more than this consistently usually means a leak rather than weather.

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Questions

About this calculator

How much water loss is normal?

A quarter to half an inch a day in summer, which on an average pool is a few percent a month. Consistently more than that is worth a bucket test for a leak.

Is it cheaper to have it delivered?

Sometimes, particularly where water is metered expensively or the supply is slow. A tanker fill also avoids running a well dry.

The formula

hours = gallons / GPM / 60

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Estimating is the easy part

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