Backup Generator Fuel Usage Calculator

Estimate diesel or biodiesel consumption for standby generators based on size, load, runtime and conditions.

Generator

Rated power output of your generator

35% of rated capacity

25-35% typical for essential loads, 50-70% for comfort loads

Runtime

Expected continuous runtime duration

Biodiesel uses ~7% more fuel than diesel

Environment

Ambient operating temperature affects efficiency

Higher altitude reduces air density and engine efficiency