Generator Fuel Consumption Calculator

Fuel Consumption Estimator

Estimate diesel consumption and fuel cost for any generator at any load level.

Generator kVA Rating

Load Percentage (%)

Diesel Price (per Liter)

USD per liter

Operating Hours per Day

Liters / Hour

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Cost / Hour

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Cost / Day

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Cost / Month

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How We Calculate Fuel Consumption

Diesel generators typically consume 0.21–0.28 L/kWh at full load, depending on engine efficiency:

Fuel (L/h) = kVA × PF × Load% × 0.26 ÷ 100

Where 0.26 L/kWh is the industry-average specific fuel consumption for modern diesel engines at 75% load.

Generator	25% Load	50% Load	75% Load	100% Load
50 kVA	2.6 L/h	5.2 L/h	7.8 L/h	10.4 L/h
100 kVA	5.2 L/h	10.4 L/h	15.6 L/h	20.8 L/h
300 kVA	15.6 L/h	31.2 L/h	46.8 L/h	62.4 L/h
500 kVA	26.0 L/h	52.0 L/h	78.0 L/h	104.0 L/h