How much does it cost to run a generator per day?
Fuel is the real cost, and it's load-dependent. Here's how to figure your daily number.
The math
Daily cost = burn rate (gal/hr) × hours × fuel price. The catch: consumption isn't linear with load. A generator at 50% load burns about 65% of its full-load rate, not half. A 7,500W gasoline unit at half load burns roughly 0.5 gal/hr — about 12 gallons over 24 hours, or roughly $40–$48 a day at typical prices.
Fuel matters
Propane holds more gallons-per-day but stores indefinitely; diesel is most efficient per gallon but mainly commercial. Get your exact numbers from the estimator:
Common questions
How much does it cost to run a generator per day?
It depends on size, load, and fuel price. A 7,500W gasoline generator at 50% load burns roughly 0.5 gallons per hour — about 12 gallons a day, or roughly $40–$48 at typical pump prices. Propane and diesel differ. Use the fuel estimator for your numbers.
Is it cheaper to run a generator or stay on the grid?
Grid power is far cheaper per kWh than generator fuel. A generator is for outages, not routine savings — fuel cost per kWh is several times the grid rate.