Electric Bill Savings Calculator

Enter your current monthly electric bill and either a percent reduction or the kWh you expect to save times your rate. The calculator instantly shows monthly, yearly, and 10-year savings — with an editable rate-increase assumption — all in your browser, nothing uploaded.

📖 How it works & FAQ

How do you want to enter the savings?

Current monthly electric bill ($)

Usage reduction (%)

Assumed rate increase (%/yr)

What a small energy cut is really worth

It is hard to get excited about turning the thermostat down two degrees until you see the number over ten years. This calculator does that math instantly. In percent mode it multiplies your current monthly bill by the reduction you expect — a 10% cut on a $150 bill saves $15 a month. In kWh mode it multiplies the kilowatt-hours you expect to save each month by your electricity rate, which is handy when you know exactly what you are unplugging, like a 100 kWh-per-month space heater at $0.17 per kWh. Yearly savings is simply twelve times the monthly figure, and the 10-year total compounds your savings using the rate-increase assumption you set, since electricity prices rarely stay flat. Everything runs in your browser — nothing you type is uploaded anywhere. These are estimates only, not professional or financial advice; utility rates, fees, and seasonal usage vary.

How to use it

Choose how to enter your savings: a percent reduction of your bill, or kWh saved times your rate.
Enter your current monthly electric bill. Averaging a full year of bills smooths out summer and winter swings.
In percent mode, set the usage reduction you expect. In kWh mode, enter the kilowatt-hours saved per month and your rate from a recent bill.
Adjust the assumed yearly rate increase if you like — US electricity prices have historically climbed a few percent per year.
Read the monthly, yearly, and 10-year savings cards. They update live as you type.

FAQ

What is a realistic reduction percentage?: Small habit changes — a smarter thermostat schedule, washing in cold water, killing phantom loads on power strips — commonly trim 5–15%. Bigger projects like a heat pump, added insulation, or replacing an old refrigerator can cut 20% or more.
Which mode should I use?: Use percent mode for broad behavior changes you can only guess at. Use kWh mode when you know the specific load you are removing — multiply the appliance's watts by its hours of use and divide by 1,000 to get kWh per month.
Why is the 10-year number more than 10× the yearly savings?: Because every kWh you avoid gets more valuable as rates rise. The calculator compounds the rate-increase assumption year by year, and shows the flat-rate figure alongside it. Set the increase to 0% for flat math.
Is my information private?: Yes. The calculator is plain JavaScript running entirely on your device — no accounts, no server, and nothing is stored or sent anywhere.