Don't know your kWh? Calculate it from meter readings
Options — fixed charge, tax, billing period
An electricity bill is energy multiplied by price: the kilowatt-hours you used times the rate your supplier charges per kWh. Estimate your electricity bill from your kWh usage and rate, or switch modes to work out what any single appliance costs to run per day, month and year. Everything runs in your browser — no sign-up, nothing stored.
How to estimate your electricity bill
Your electricity bill is built from three parts: the energy you used, a fixed supply or service charge, and tax. Energy is measured in kilowatt-hours (kWh) — one kWh is a 1000-watt appliance running for an hour. Your utility charges a rate per kWh, so energy cost = kWh × rate. Add the fixed charge and any tax and you have the total bill. Enter your numbers above; if you only have meter readings, open the meter section and we'll work out the kWh for you.
Using the electricity cost calculator for a single appliance
Switch to Cost to run an appliance to turn one device's wattage into a running cost. Pick an appliance for a typical wattage (you can edit it), set how many hours a day you use it, and the calculator shows the cost per day, for the period, and per year. It's the quickest way to see what a space heater, air conditioner, dryer or gaming PC actually adds to your bill.
Tips for an accurate estimate
Use the rate printed on your own bill rather than a national average — rates vary widely by region and plan. Wattage on the appliance label is the maximum draw; devices that cycle on and off (fridges, air conditioners) use less on average, so treat appliance estimates as an upper bound. Everything here is computed in your browser and nothing is stored.