Water Tank Capacity Calculator (litres)
Enter the length, width and height of a rectangular tank or sump in feet to see how many litres it holds.
Quick answer
6 × 5 × 4 ft tank: 3,398 litre.
How it is calculated
- Volume = length × width × height = 6 × 5 × 4 = 120 cu ft.
- 1 cu ft = 28.317 litres.
- Capacity = 120 × 28.317.
Worked example
A tank 6 ft long, 5 ft wide and 4 ft high holds about 3,398 litre of water.
| Length | 6 ft |
| Width | 5 ft |
| Height | 4 ft |
| Capacity | 3,398 litre |
Formula
Capacity = Ln×Wd×Ht×28.3168
Good to know
- Use inside measurements, without wall thickness.
- A little space stays empty at the top; real fill is 90–95%.
Questions people ask
How many litres in 1 cu ft?
28.317 litres.
What size for a 1,000 litre tank?
About 35.3 cu ft, e.g. 4 × 3 × 3 ft (36 cu ft).
Measurements in metres?
1 m³ = 1,000 litres. Multiply metres by 3.281 to enter feet.
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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0