Electricity Cost Calculator

Calculate the electricity cost of any device. Free online tool for daily, monthly, and annual costs from wattage, usage hours, and tariff.

Daily consumption
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kWh
Cost per hour
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Daily cost
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Monthly cost
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Annual cost
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How It Works

  1. Enter the device's power consumption in watts (W) — find it on the label, manual, or manufacturer's website.
  2. Specify how many hours per day you use the device.
  3. Enter your electricity tariff in your local currency per kilowatt-hour (e.g. £/kWh or $/kWh).
  4. Click 'Calculate' and instantly see the cost per day, month, and year.
  5. Adjust the values to compare different devices or usage scenarios side by side.

Example

Input: Electric kettle: 2000 W, 0.5 hours/day, tariff £0.29/kWh
Result: Daily cost: £0.29 | Monthly: ~£8.70 | Yearly: ~£105.85

FAQ

The wattage is usually printed on a label on the bottom or back of the device, in the user manual, or listed in the technical specifications on the manufacturer's website.

Your data is completely private. All calculations are performed client-side in your browser on your own device. No data is ever sent to any server or third party.

Your rate per kWh appears on your electricity bill or on your energy supplier's website. In the UK it is typically around £0.24–0.34/kWh depending on your tariff.

The calculator estimates energy consumption costs only. Your real bill also includes standing charges, network fees, taxes, and VAT, which are not included in the per-kWh rate.

Yes. Calculate each device separately and add the results together to get the total estimated cost for your household.