Horsepower to Fuel Consumption Calculator

Horsepower to Fuel Consumption Guide

Estimate fuel consumption for engines based on horsepower, BSFC, and fuel type to optimize performance and efficiency.

How It Works

The calculator determines fuel consumption in gallons per hour (GPH) using the formula:

GPH = (HP × BSFC) / Fuel Density

• HP (Horsepower): The engine's power output.
• BSFC (Brake Specific Fuel Consumption): Fuel used per horsepower per hour, typically 0.45–0.55 lb/hp·hr for gasoline, lower for diesel.
• Fuel Density: Weight of fuel per gallon (e.g., Gasoline: 6.1 lb/gal, Diesel: 7.1 lb/gal, Ethanol: 6.6 lb/gal).

Typical Fuel Densities

Fuel Type	Density (lb/gal)
Gasoline	6.1
Diesel	7.1
Ethanol	6.6

Example Calculation

For a 200 HP gasoline engine with a BSFC of 0.45 lb/hp·hr:

GPH = (200 × 0.45) / 6.1 = 14.75 gallons per hour

Key Considerations

• Load and RPM: Real-world consumption varies due to engine load and RPM.
• Altitude: Higher altitudes may reduce efficiency.
• Engine Condition: Regular maintenance ensures optimal BSFC.