Pool Volume Calculator
A rectangle is length times width times a single depth. A circle is π r² times that depth. Output is cubic meters, liters, and US gallons. Freeform hoppers and spa benches are omitted. Estimate only, not a fill ticket.
Rated 4.7 out of 5 based on 408 reviews
How to estimate pool volume
- Pick rectangle or circle, then feet or meters for every size on the form.
- For a rectangle enter length, width, and a single depth. For a circle enter radius and depth.
- Read cubic meters, liters, and US gallons. Liters are m³ × 1000. US gallons divide m³ by 0.003785411784.
- A hopper, beach entry, or spa bench needs extra geometry you add yourself. Not a fill ticket.
Constant-depth pool volume
Rectangle or circle, one depth
| Rectangle | L × W × D after converting to meters |
|---|---|
| Circle | π r² D after converting to meters |
| Liters | m³ × 1000 |
| US gallons | m³ / 0.003785411784 |
| Default rectangle | 20 ft by 10 ft by 5 ft |
| Advice | Estimate only. Not a fill ticket or a tank stamp. |
What this pool volume includes
The water is a prism or a cylinder of one depth. A typical backyard pool slopes from shallow to deep. Using the deep-end depth overstates gallons. Using the shallow-end depth understates them. A manufacturer tank with a stamped capacity is the tank volume page, which models vertical, horizontal, and box tanks, not a swimming pool freeform.
How gallons are computed
Feet convert with 0.3048 m. A rectangle volume in m³ is length × width × depth in meters. A circle is π r² times depth. Liters multiply m³ by 1000. US gallons divide m³ by 0.003785411784. Depth is one number, not a two-slope average unless you type that average yourself.
Hoppers, spas, and fill tickets
A fill ticket from a water hauler uses a meter, not this prism. Chemical dosing uses gallons as a starting guess. Freeform kidney shapes, tanning ledges, and attached spas are extra volumes. Not structural design of a shell.
Use cases
A rectangular 20 by 10 by 5 ft sketch, or a round stock-tank pool. Not a permit and not a plaster takeoff.
Limits
One depth. Rectangle or circle only. Estimate only, not a fill ticket. CZNull does not receive the sizes.