Electricity cost calculator
Pick a country, choose an appliance (or enter custom watts), and see exactly what it costs to run — daily, monthly, yearly.
Your results
Based on the inputs on the left.
cost = (watts ÷ 1000) × hours × rate
1 kWh means using 1,000 watts for one hour. If your device is 1,500 W and runs 2 hours, that's 3 kWh — multiply by your rate to get the cost.
Frequently asked questions
Where do the country-average rates come from?
We use public data from the US EIA, UK Ofgem, Eurostat, Ireland's CRU, and the Australian AER. Rates are refreshed quarterly. Your actual tariff may vary — always override the kWh field with your own bill's number for the most accurate result.
Why is the yearly cost so high?
The yearly estimate assumes the device runs the same hours every day year-round. That's rarely true — an AC runs 4 months a year, a heater 5 months. Multiply the monthly figure by the months you actually use it for a realistic number.
Does the calculator handle time-of-use rates?
Not yet — it uses a flat rate per kWh. If you have a TOU plan (off-peak/on-peak), split your usage: run the calculator once with off-peak hours and again with on-peak, then add both.
Do EVs and heat pumps have different formulas?
The physics is the same: watts × hours ÷ 1000 = kWh. But their effective wattage varies by temperature (heat pumps) or charging speed (EVs). Our dedicated guides cover those edge cases.