Pool Volume Calculator in 3D
See how much water your pool holds. Choose its outline, enter the inside dimensions and water depths, then lower the waterline or look through the side. The gallons, liters, and filling time update with the model.
Explore This Calculator
liters
cubic meters
average water depth
Drag to Rotate
Water depth is measured vertically from the water surface to the pool floor.
At the normal waterline. Depth labels show the water currently in the pool.
Volume follows the selected outline with vertical walls and either a flat floor or one continuous straight slope. Steps, benches, curved walls, and separate deep hoppers change the result.
Follow the Waterline Down
The pool shell stays the same while the amount of water changes. A waterline drop reduces both end depths by the same vertical amount. The slider stops when the shallow-end floor reaches the waterline.
At These Measurements
- Normal-waterline capacity
- Current shallow water
- Current deep water
- Water to return to normal
- Inside plan area
Each 1-inch waterline change is about while the whole floor remains covered.
How Long Will It Take to Fill?
Enter the combined flow reaching the pool. Filling time assumes a constant flow with no leaks or interruptions. Use your own water tariff to estimate the water charge.
Time a measured container to estimate the actual flow.
Optional. Enter your local volumetric rate; fixed fees are additional.
Volume ÷ flow
to add
Uses the current water volume
The Outline Changes the Volume
Use inside dimensions at the waterline. The average of the two end depths applies to a straight floor slope across these symmetric shapes. A racetrack outline includes straight sides between two semicircular ends; it holds more than an ellipse with the same overall length and width.
Rectangle
A = LWLength × width
Round
A = πD² / 4D is the full inside diameter
Oval / Ellipse
A = πLW / 4L and W are the full axes
Oblong / Racetrack
A = (L − W)W + πW² / 4L ≥ W; semicircular ends
512 ft² × 5 ft = 2,560 ft³
US gallons
Imperial gallons
Liters
Cubic feet
US and Imperial gallons are different units. This calculator uses 1 US gallon = 3.785411784 liters and 1 Imperial gallon = 4.54609 liters.
Pool Volume Questions
Should I measure the wall height or water depth?
Measure from the normal water surface to the floor. The rim and empty space above the normal waterline do not hold water in this calculation. Use the waterline slider for a lower current level.
Can I use this for an above-ground pool?
Yes. Choose the matching inside outline and a flat floor if the depth is constant. Use actual water depth, which is usually less than the total wall height.
What if the pool has a shallow flat area, a ramp, and a deep flat area?
The two-end average is not enough for that floor profile. Calculate each region from its own plan area and average depth, then add the volumes. This model represents a single straight slope or flat floor.
Does this calculate pool chemical doses?
This page calculates water volume and filling quantities. Product concentration, current test readings, and treatment targets are separate inputs needed for dosing.
Why does an oval sometimes use a different formula?
“Oval” can describe an ellipse or an outline with straight sides and rounded ends. These shapes enclose different areas. Choose the outline that matches your pool instead of applying one factor to every rounded pool.
Pool Volume Calculator in 3D
Keep the labeled pool, depth cutaway, and volume formula together. The image uses the default dimensions; adjust the calculator for your own pool.
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