Estimate appliance running cost, energy use in kWh, and CO2 emissions from wattage, hours of use, and your per-kWh rate.
Appliance presets
Check the device label or nameplate (W or kW).
Look for "price per kWh" on your latest bill.
Estimated cost
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per year
Per hour
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Per day
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Per week
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Per month
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CO2 emissions (est.)
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Uses the same rate and currency selected on the single-appliance tab.
Household appliances0 items
Total annual cost—
Frequently asked questions
How do I find an appliance's wattage?
Look at the rating label on the back or bottom of the device. It usually shows "W" (watts) or sometimes amps and volts — multiply amps by volts to get watts. User manuals and manufacturer websites also list power draw. For appliances with variable draw (fridges, AC units), use the rated average, not the startup spike.
What about hidden costs I can't see on the label?
Many devices use more energy than their label suggests: compressors cycle on and off, heating elements pull full load only when heating, and electronics run standby modes 24/7. This calculator estimates average running cost. For an exact figure, use a plug-in energy meter for one week.
What is vampire / standby power?
Devices left plugged in — TVs, chargers, game consoles, coffee machines — still draw 1 to 10 watts each in standby. Across a home this can add up to 5–10% of the yearly bill. To include it, estimate the device's standby wattage (1–5 W is typical) and set usage to 24 hours a day.
How do peak and off-peak tariffs affect the result?
Some utilities charge a higher rate during peak hours (often 4–9 pm) and a lower rate overnight. This calculator uses a single flat rate. If you have a time-of-use tariff, enter a weighted average or calculate peak and off-peak usage separately and add the results together.
How can I reduce my electricity bill?
Switch incandescent bulbs to LED (saves ~85% per bulb). Unplug chargers and electronics when not in use. Run washers and dishwashers on eco cycles. Use a smart thermostat for AC and heating. Replace old refrigerators — a 15-year-old model can cost twice as much to run as a new one.
How is CO2 estimated?
The calculator uses a global average of about 0.4 kg CO2 per kWh. Your actual emissions depend on your local grid mix: coal-heavy regions emit 0.7–1.0 kg/kWh, while renewables-heavy regions can be below 0.1 kg/kWh. Check your utility's emissions factor for a more accurate figure.
Estimates only. Actual bills depend on your tariff, standing charges, taxes, and real usage patterns.
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The electricity cost calculator turns an appliance wattage, daily run time, and your per-kWh rate into a full cost breakdown: per hour, day, week, month, and year. It also shows energy use in kWh and an estimate of CO2 emissions based on a grid average of about 0.4 kg per kWh. Choose a country preset for a realistic starting rate (for example, 0.17 USD in the US, 0.28 GBP in the UK, 0.40 EUR in Germany) or enter a custom rate from your own bill. A preset grid covers common appliances: LED bulbs, refrigerators, washing machines, TVs, ovens, kettles, air conditioners, EV chargers, and more. A multi-appliance mode lets you add several devices and see the total annual household cost. Example: a 150 W refrigerator running 24 hours at 0.17 USD per kWh costs about 223 USD per year and emits roughly 526 kg of CO2.