Appliance Electricity Bill Calculator
Add your appliances, set the hours they really run and get the monthly, yearly and daily cost at your own rate — forty presets, live recalculation, currency shown as you choose. Nothing is uploaded.
energy
Energy Tools
Generator fuel burn, full-tank runtime, the wattage you actually need and what your appliances cost to run. Three calculators, all running entirely in your browser.
direct answer
Use the wattage sizing calculator before you buy a generator, then the fuel estimator to price an outage. For the bill you already have, the appliance bill calculator turns watts and running hours into a monthly cost. All three run locally; nothing is uploaded.
Generator Fuel Runtime & Cost Estimator
Fuel per hour, full-tank runtime, cost to fill the tank and cost to run per hour — gasoline, diesel, propane and natural gas, with kW/kVA handled for you.
Portable Generator Wattage Sizing Calculator
Tick the appliances you need on generator power and get total running watts, peak surge watts and the recommended generator size — running watts + the single largest starting surge, then × 1.20. Presets for storm outages, RV camping and jobsite work.
energy guides
Work the numbers by hand
One guide per tool: the bill calculator's inputs, how much fuel a generator burns, and the sizing formula — with worked examples you can reproduce.
How to Use the Appliance Electricity Bill Calculator
A space heater, a four-appliance bill and an LED swap — the exact inputs, the arithmetic in between, and the five traps that make an estimate wrong.
How Much Gas Does a 5000-Watt Generator Use Per Hour?
0.80 gal/h at full load, 0.60 at 75% — with the chart for every portable size, the one-line formula, and why your owner's manual quotes a different figure.
What Size Generator Do I Need?
The whole calculation in three steps — running watts, one starting surge, × 1.20 — with a worked storm-outage example and the five mistakes that leave people in the dark.
Also in the lab: privacy tools for policy checking and PDFs that never leave your device.
Privacy tools