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Generator Fuel Consumption Calculator | Hourly Fuel Sizer

Fuel Consumption Calculator

Estimate hourly and daily fuel usage for Gasoline, Diesel, Propane, and Natural Gas generators.

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Generator Settings

W
50%
10%50%100%
Gallons

Estimated Consumption

-- gal/hr
Daily Usage (24h) --
Active Load -- kW
Total Runtime -- hrs

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Fuel Consumption Chart (Estimated)

Calculations Formula

Hourly Fuel Usage = Active Load (kW) × Fuel Consumption Rate

Estimated fuel usage for a 5000W generator running on Gasoline at various load levels.

Load Active Power Hourly Usage Daily Usage (24h) Runtime (5 gallons)

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Typical Consumption Rates

Gasoline

~0.14 gal / kWh

Standard portables

Diesel

~0.08 gal / kWh

Most efficient

Propane

~0.18 gal / kWh

(~0.75 lbs / kWh)

Natural Gas

~12 ft³ / kWh

Whole house units

*Note: Estimates assume 50% load. Efficiency decreases slightly at light loads (<25%).