How Many Gallons in a 24-Foot Round Pool? (2026 Guide)
How many gallons in a 24-ft round pool? At a 4 ft average depth it holds about 13,500 gallons — about 11,900 at a 3.5 ft depth. Get the exact volume with our free pool calculator.
The 24-foot round pool formula
A round pool is a cylinder, so volume = bottom area × depth: π × (D ÷ 2)² × average depth × 7.48. For a 24-ft pool the radius is 12 ft and 3.14 × 144 ≈ 452.4 sq ft of surface.
Worked example at a 4 ft average depth: 452.4 × 4 × 7.48 ≈ 13,530 gallons. That is why "13,500 gallons" is the figure you see on most 24-ft round pool listings — it assumes the pool is kept near a 4 ft average. Drop the fill to a 3.5 ft average and the same pool needs only about 11,840 gallons. Let the pool volume calculator do the multiplication whenever your depth differs.
Gallons at every common depth
All figures use 452.4 sq ft of surface area times 7.48 gallons per cubic foot:
| Average depth | Water volume (24-ft round) |
|---|---|
| 3.0 ft | 10,150 gallons |
| 3.5 ft | 11,840 gallons |
| 4.0 ft | 13,530 gallons |
| 4.5 ft | 15,220 gallons |
Each extra half-foot of average depth adds roughly 1,700 gallons, so the fill level matters as much as the pool's listed diameter.
How a 24-ft pool compares to smaller rounds
Holding depth steady at a 4 ft average, the diameter drives the water bill:
| Pool diameter | Surface area | Gallons at 4 ft average |
|---|---|---|
| 15 ft | 176.7 sq ft | 5,290 gallons |
| 18 ft | 254.5 sq ft | 7,610 gallons |
| 21 ft | 346.4 sq ft | 10,360 gallons |
| 24 ft | 452.4 sq ft | 13,540 gallons |
Area grows with the square of the diameter, so the jump from 21 ft to 24 ft adds about 3,200 gallons at the same depth — the biggest single step in the table. The same math, worked out for the next size down, appears in our guide to the 18-ft round pool.
Reading the real depth of a 52-inch pool
A 52-in tall round pool rarely runs full. Most owners fill to about 46–48 in of water so the skimmer works and the liner stays below the top rail. At that fill the average depth lands near 3.75 ft rather than the wall's 4.33 ft, which gives 452.4 × 3.75 × 7.48 ≈ 12,680 gallons.
That gap between the manufacturer's "13,500" and the real ~12,680 is normal: capacity figures assume a near-full pool. If you are ordering water or dosing chemicals, measure your own waterline depth and run the numbers for your exact fill.
Practical tips for a 24-ft round
- Dose chemicals by your real gallons — shock, chlorine and algaecide rates are quoted per 10,000 gallons; using 13,500 when your pool holds 12,680 over-treats by nearly 10%.
- Measure depth mid-pool — take the waterline-to-floor reading near the center drain, where the depth is most representative; for a sloped floor, average the shallow and deep ends.
- It is a big-water pool — 24 ft is one of the most common large round sizes, and its ~13,500 gallons need a properly matched pump and filter rather than the unit sold with a 15-ft pool.
Wondering whether the 24-ft was the right call, or how the whole family of round pools sizes up? Compare it against our round-up of gallons of water in a pool before you set the fill level.
FAQ
How many gallons are in a 24-foot round pool?
About 13,500 gallons at a 4 ft average depth. The 24-ft circle covers about 452.4 sq ft, so 452.4 × 4 × 7.48 ≈ 13,530 gallons; at a shallower 3.5 ft average it is about 11,840.
How many more gallons does a 24-ft pool hold than a 21-ft pool?
About 3,200 gallons more at the same depth. At a 4 ft average a 24-ft pool holds about 13,540 gallons versus about 10,360 for a 21-ft pool — a difference of about 3,180 that rounds to roughly 3,200.
Where should I measure the depth of a round pool?
Measure in the middle, where the depth is most representative of the whole pool. Use the waterline-to-floor reading at center for a flat-bottomed round; if the floor slopes, average the shallow and deep readings before multiplying.
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