Overhead Water Tank Litres Calculator

Find out how many litres in a water tank with this calculator that converts feet dimensions to litres. Use the free Overhead Water Tank Litres Calculator below — enter your values and get instant results, right in your browser. 1 cubic foot = 28.3168 litres. Tank litres = length (ft) × width (ft) × height (ft) × 28.3168. 1 UK gallon = 4.546 litres; 1 US gallon = 3.785 litres.

How to use the Overhead Water Tank Litres Calculator

Water tanks in Pakistan are sold in litres — 500, 1000 or 2000 litres — but rooftop tanks are built or measured in feet, which makes matching the tank to the family need confusing. This overhead water tank litres calculator converts between cubic feet, litres, cubic metres and gallons instantly. Measure your tank length × width × height in feet to get cubic feet, convert to litres here, and you will know whether that new tank is really the 1000-litre size the shopkeeper claims.

  1. Measure the tank length, width and height in feet and multiply them to get cubic feet.
  2. Type that cubic-feet figure into the amount box (Cubic feet is pre-selected).
  3. Check the big result line to read the capacity in litres.
  4. Use the swap button to convert the other way — litres back to cubic feet.

Formula

1 cubic foot = 28.3168 litres. Tank litres = length (ft) × width (ft) × height (ft) × 28.3168. 1 UK gallon = 4.546 litres; 1 US gallon = 3.785 litres.

Worked example

A rooftop tank measuring 4 × 3 × 3 feet holds 36 cubic feet. Converting gives 36 × 28.3168 = 1,019 litres — essentially a standard 1000-litre tank, enough for a small family for about a day. If the shopkeeper claims it is a 1500-litre tank, the math proves otherwise, so always convert the measured dimensions before paying.

Frequently asked questions

36 cubic feet × 28.3168 = about 1,019 litres, sold as a 1000-litre tank.

Roughly 1000 to 1500 litres of storage covers a day of normal household use for 5 people.

No. One litre = 0.264 US gallons, so a 1000-litre tank is about 264 US gallons or 220 UK gallons.

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