Measure your energy use — and cut it.
Six free calculators and checklists. No sign-up, no email, no data stored. Everything runs in your browser.
All tools
6 calculatorsAppliance Energy Cost Calculator
Find out how much a specific appliance costs you per month based on wattage, hours, and your electricity rate.
Open toolStandby Power Cost Estimator
See how much "phantom load" from always-on devices costs you each year — and how a smart strip can fix it.
Open toolThermostat Savings Planner
Estimate how much you can save by adjusting your thermostat a few degrees up or down.
Open toolWater Heater Cost Calculator
Understand your water heating bill and how much you can save by lowering the tank temperature.
Open toolHome Energy Quick Audit Checklist
Score your home’s energy readiness in 60 seconds with five simple checks.
Open toolLED Savings Calculator
See exactly how much you'll save by replacing old bulbs with LEDs — and how fast it pays back.
Open toolHow to use these tools
3 stepsPick one tool
Start with the appliance calculator or the quick audit — they give you the fastest insight.
Enter your numbers
Use your recent electricity bill and the label on the appliance. Rough numbers are fine.
Act on the result
Read the linked how-to article that matches your biggest energy drain — that’s where the savings are.
Go deeper
More contentPillar Guides
Long-form guides that cover entire topics in depth.
How-To Articles
Step-by-step fixes for specific energy drains.
Back to Home
Return to the homepage and browse popular topics.
Your privacy: All calculations run in your browser. We don’t store any of the values you enter.