Pool Gallons Calculator – Estimate Pool Water Volume
Calculate how many gallons of water your pool holds. Supports rectangular, circular, and oval pool shapes. Enter dimensions for instant results.
Pool Gallons Calculator Formula
Rectangular: L x W x D x 7.48; Circular: π x (D/2)² x D x 7.48; Oval: π x (L/2) x (W/2) x D x 7.48
How to Calculate Pool Gallons
- 1. Measure the pool dimensions in feet (length, width, diameter, depth)
- 2. For rectangular pools: Volume (cu ft) = Length x Width x Depth
- 3. For circular pools: Volume (cu ft) = π x (Diameter/2)² x Depth
- 4. For oval pools: Volume (cu ft) = π x (Long Diameter/2) x (Short Diameter/2) x Depth
- 5. Convert to gallons: Gallons = Volume (cu ft) x 7.48
Example Calculation
Let's say you're filling a 24ft round above-ground pool with 4ft average depth.
- shape: circular
- diameter: 24
- depth: 4
The pool holds approximately 13,526 gallons of water
Tips
- Use the average depth if your pool has a shallow and deep end — measure both and divide by 2
- One cubic foot of water contains 7.48 gallons
- A standard garden hose flows at about 8-12 gallons per minute, so filling a 13,000 gallon pool takes roughly 18-27 hours
- For irregular pool shapes, break the pool into sections and calculate each separately, then add them together
- Knowing your pool's gallon capacity is essential for proper chemical treatment and filter sizing
Frequently Asked Questions
How many gallons in a 24ft round pool?
A 24-foot round pool with a 4-foot average depth holds approximately 13,526 gallons. At 3 feet deep it holds about 10,145 gallons, and at 4.5 feet deep it holds about 15,218 gallons.
How many gallons in a 15x30 pool?
A 15x30 rectangular pool with a 4-foot average depth holds approximately 13,464 gallons. This is calculated as 15 x 30 x 4 x 7.48 = 13,464 gallons.
What is the average gallons in an inground pool?
An average inground pool holds between 15,000 and 20,000 gallons. Small pools may hold 10,000-15,000 gallons, while large pools can hold 25,000+ gallons.