// multi-utility computation suite · offline · instant · precise
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tool.generator-fuel-runtime Calculator
Calculates generator run time from fuel tank capacity, engine fuel consumption rate, and load percentage, with a 20% fuel reserve. A 5 kW generator running at 50% load on a 5-gallon tank runs approximately 10 hours — this makes outage planning concrete.
Inputs
Tank Gallons
Reference formula or conversion factor shown for context.
Load Kw
Applied force or weight (N or kN). Divide into dead load (permanent) and live load (variable — people, wind, etc.).
Rated Kw
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Fuel Rate At Full
Applied force or weight (N or kN). Divide into dead load (permanent) and live load (variable — people, wind, etc.).
Results
runtime (hours)
The result expressed in hours. Divide by 24 to convert to days.
fuel consumption rate (gal/hr)
The arithmetic total of all input values.
load factor
A dimensionless multiplier applied in the calculation.
fuel for 24hr operation (gal)
The proportional relationship between two quantities.
at 50% load fuel savings
Total money or resources saved compared to the baseline or alternative scenario.
generator efficiency
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.