Measure the water in a rectangular, round, oval, kidney, or freeform pool, weighting a compound floor by the length of each run, and estimate the time to fill it.
Change the inputs that matter to your decision. Optional assumptions stay collapsed until you need them.
A pool with a long shallow end holds less than the mean of its two end depths suggests.
Rectangular pool with flat shallow end, slope, flat deep end, averaging 5.19 ft deep over 512 ft².
Every chemical dose is proportional to volume, so it is the one number the Pool Chemical Calculator needs. This link carries it across for you.
| Length | 32 ft |
|---|---|
| Width | 16 ft |
| Shallow end | 3 ftflat for 12 ft |
| Deep end | 8 ftflat for 8 ft |
| Slope run | 12 ftThe transition between the two flats |
| Surface area | 512 ft²Rectangular |
| Perimeter | 96 ftFor coping, tile band, and cover edging |
| Average depth | 5.19 ftFlat shallow end, slope, flat deep end |
| Volume | 19,868 gal75,210 L |
| Water weight | 165,809 lbWorth knowing before an above-ground install |
| Time to fill | 33.1 hoursAt 10 gal/min |
A compound floor is weighted by the length of each run rather than averaging the two end depths, which overstates the water in a pool with a long shallow end. Kidney pools use the trade factor of 0.45 across both lobe widths; no perimeter is given for a kidney or freeform shape because three measurements do not determine one.
Practical notes about the inputs, assumptions, and result.
Because most pools are not a uniform slope. A 32 ft pool with a 12 ft flat shallow end at 3 ft, a slope, and an 8 ft flat deep end at 8 ft averages about 5.09 ft, not the 5.5 ft you get from averaging the two end depths. That is a seven percent difference in water, and every chemical dose is proportional to it.
Because three plan measurements do not determine the outline of a waisted or freeform shape. A number could be produced, but it would not be your pool's. For coping and cover edging on those shapes, run a tape around the actual edge.
No. It is the water volume of the plan shape to the waterline. Steps, benches, tanning ledges, and a spa spillover all displace water, so a pool with a large entry step will hold a little less than this figure.
For routine dosing, within about five percent is fine — you add roughly three quarters of a dose and retest anyway. For a first fill, a heater sizing, or a liner order it is worth confirming against the builder's specification or reading your water meter across a refill.
Usually 8 to 12 gallons per minute, which is why a 20,000 gallon pool takes a day and a half or more. The fill rate is editable, so a tanker delivery or a larger supply can be modelled instead.
A 20,000 gallon pool holds around 167,000 lb of water. For an above-ground pool that is the number that decides whether the ground under it is adequately prepared, and it is worth seeing before installation rather than after.
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