Fuel Tank Capacity Calculator 🛢️

Calculate your boat's fuel tank volume in US gallons and liters. Supports rectangular and cylindrical tank shapes.

How to Use the Fuel Tank Capacity Calculator

Select tank shape (rectangular or cylindrical), enter inside dimensions in inches. 1 US gallon = 231 cubic inches.

Rectangular: Volume = L × W × H. Cylindrical: Volume = π × (D/2)² × L. Measure inside dimensions.

Leave 5–10% ullage for fuel expansion. Never fill a marine fuel tank 100% full.