How it's calculated
cylinder V = π × (D÷2)² × H; gallons = litres ÷ 3.785
V = volume, D = diameter, H = height or length, π ≈ 3.14159. Rectangular V = L×W×H; oval V = π×(W÷2)×(H÷2)×L. 1000 L per m³; ÷3.785 converts litres to US gallons.
Common questions
What is an oval tank?
It is a horizontal cylinder with an elliptical cross-section, common for fuel and water storage. Enter its width, height, and length.
Does it give both US and UK gallons?
Yes. The US gallon is about 20 percent smaller than the UK imperial gallon, so the calculator shows both.