Fuel Burn Rate GPH Calculator

Calculate your boat engine fuel consumption in gallons per hour based on engine horsepower, RPM, and engine type. Know your burn rate before you leave the dock.

Results

Visualization

How It Works

Fuel burn rate follows the cube law — doubling RPM increases fuel use by 8x. At wide-open throttle (WOT), a gas outboard burns roughly 1 GPH per 10 HP. Diesel engines are about 25-30% more fuel efficient. Most boaters cruise at 60-75% throttle for the best balance of speed and economy. The sweet spot for fuel efficiency is usually 3,000-3,500 RPM for most outboards.