21 × 41 ft oval above-ground pool: gallons and litres
A standard 21 × 41 ft oval above-ground pool with a 52 in wall holds about 21,976 US gallons (83,187 litres) when filled 6 in below the top. Change the size or depth below to match your pool.
Gallons by wall height
| Wall | Water depth | US gallons | Litres | UK gallons | Water weight |
|---|---|---|---|---|---|
| 48 in | 42 in (107 cm) | 20,065 | 75,953 | 16,707 | 167,450 lb |
| 52 in | 46 in (117 cm) | 21,976 | 83,187 | 18,299 | 183,400 lb |
| 54 in | 48 in (122 cm) | 22,931 | 86,804 | 19,094 | 191,370 lb |
Filled right to the top of a 52 in wall it would hold 24,842 gallons — the figure some charts quote. Surface area: 766 ft² (71.2 m²).
Looking after 21,976 gallons
| Raise free chlorine by 1 ppm | 22.5 fl oz of 12.5% liquid chlorine (665 mL) — guidance, follow the label |
|---|---|
| Salt for a salt system (0 → 3,200 ppm) | 587 lb (266 kg), 15 × 40 lb bags |
| Pump flow for an 8-hour turnover | 45.8 GPM (10,398 L/h) |
| Fill time at 6 GPM | 2.5 days |
| Evaporation at ¼ in a day | about 836 gallons a week |
Work out exact doses with the chlorine and salt calculators, and check your pump with the turnover calculator.
Questions
How many gallons is a 21 × 41 ft oval pool with a 52 in wall?
About 21,976 US gallons (83,187 litres) filled to 46 in, 6 in below the top of the wall. With a 48 in wall it is 20,065 gallons and with a 54 in wall 22,931.
How many litres is a 21 × 41 ft oval above-ground pool?
75,953 L with a 48 in wall, 83,187 L with a 52 in wall and 86,804 L with a 54 in wall (18,299 UK gallons for the 52 in wall).
How long does it take to fill a 21 × 41 ft oval pool?
About 2.5 days with a 6 gallon-per-minute garden hose for the 52 in wall, or 36.6 hours at 10 GPM.