How to use
- Enter your own electricity rate per kWh in the same currency unit shown on your bill.
- Choose single-appliance mode for one device or multiple-appliance mode to total several rows.
- Enable standby power only if you want idle consumption included during the unused hours of the day.
Wave 1 household utility expansion
kWh and running cost in one page
This first release stays on flat-rate electricity pricing. It does not estimate taxes, tiered tariffs, demand charges, or local utility plans.
Inputs
| Appliance | Watts | Hours/day | Qty | Standby W | Actions |
|---|
Breakdown
| Appliance | Daily use | Monthly cost | Yearly cost | Share |
|---|
Assumptions and limits
- Electricity price is a flat price per kWh that you enter yourself. This page does not model taxes, tiered pricing, or time-of-use tariffs.
- Standby mode assumes idle power runs during the unused hours of the day, up to 24 hours total.
- Monthly estimates use a 30-day month. Yearly estimates use 365 days.
Notes
If a label says 120 W, that is power. If you run that device for 5 hours, the energy used is 120 × 5 = 600 Wh = 0.6 kWh. Cost is then kWh × your rate. This is why the page asks for both watts and hours.
Utility rates vary by supplier and plan, so enter the number shown on your own bill or tariff sheet. If your plan uses different day and night prices, run the page separately for each rate block instead of averaging blindly.
FAQ
What is the difference between watts and kWh?
Watts describe power at one moment. kWh describe energy used over time. This page converts watts and hours per day into kWh, then multiplies that by your price per kWh.
Do I need to enter my own electricity rate?
Yes. Electricity prices vary by utility, plan, taxes, and region, so this calculator asks you to enter your own price per kWh instead of guessing a local tariff.
How is this different from the electricity CO₂ calculator?
This page estimates money spent on electricity. The electricity CO₂ calculator estimates emissions from electricity use by combining kWh with an emissions factor.
What does standby mode include?
When standby mode is enabled, the calculator assumes standby power runs during the hours when the appliance is not actively used, up to 24 hours per day.