Free Pool Volume Calculator (+ Guide)

What is a pool volume calculator?

A pool volume calculator turns a pool's size and depth into the water it holds.

It works in gallons and liters, from feet or meters.

How pool volume works

The surface area × the average depth gives cubic feet. NIST Handbook 44 defines the gallon as 231 cubic inches, so 1 cubic foot is 1,728 ÷ 231 = 7.48 gallons.

A worked example

Here's the example the calculator loads: a 32 by 16 foot pool, 3 feet at the shallow end and 8 at the deep end.

32 × 16 = 512 square feet. The average depth is 5.5 feet, so 512 × 5.5 = 2,816 cubic feet, or about 21,065 gallons (79,740 liters). At 10 gallons a minute, it fills in about 35 hours.

Mistakes to avoid

These are the slips that come up most.

• Taking the deep end's depth as the pool's depth
• Measuring the deck instead of the water
• Mixing up a round pool's distance across with its radius

Who is the pool volume calculator for?

It's for pool owners and anyone filling or treating a pool, and these tools help around it.

• Square footage calculator – for the deck around it
• Cubic yard calculator – for digging or filling
• Concrete calculator – for a pool deck slab

Know your gallons, and every dose and pump size starts from the right number.