Horsepower to Gallons per Hour Calculator

Fuel Flow Rate Formula:

\[ Q_f = \frac{HP}{\rho_f \times 0.055 \times 60} \]

Fuel Flow Rate (GPH):

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1. What is a Horsepower to GPH Calculator?

Definition: This calculator estimates fuel consumption in gallons per hour (GPH) based on engine horsepower and fuel density.

Purpose: It helps engineers, mechanics, and boat owners estimate fuel consumption for engines and power systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q_f = \frac{HP}{\rho_f \times 0.055 \times 60} \]

Where:

\( Q_f \) — Fuel flow rate (gallons per hour)
\( HP \) — Engine horsepower
\( \rho_f \) — Fuel density (pounds per gallon)
0.055 × 60 — Conversion factors for units

Explanation: The formula converts mechanical power to fuel energy consumption based on fuel density.

3. Importance of Fuel Flow Calculation

Details: Accurate fuel consumption estimates help with trip planning, fuel budgeting, and engine performance analysis.

4. Using the Calculator

Tips: Enter the engine horsepower and fuel density (default 6.8 lb/gal for diesel). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What fuel density should I use?
A: Diesel is typically 6.8-7.1 lb/gal, gasoline about 6.0 lb/gal. Check your fuel specifications.

Q2: Is this for continuous or peak horsepower?
A: Use the horsepower value that matches your operating conditions (continuous rating for cruising).

Q3: How accurate is this calculation?
A: It provides theoretical maximum consumption. Actual usage depends on engine efficiency and load.

Q4: Can I use this for electric motors?
A: No, this is only for fuel-powered engines. Electric motors don't consume fuel.

Q5: What's the 0.055 factor in the formula?
A: This converts between horsepower-hours and British Thermal Units (BTUs) of energy.