How do I calculate my electricity bill?

Multiply the kilowatt-hours (kWh) you used by your rate per kWh, then add any fixed supply or service charge and tax. This calculator does it for you: enter your kWh (or your meter's start and end readings), your rate, and any fixed charge and tax percentage.

How much does it cost to run an appliance?

Cost equals the appliance's power in kilowatts (watts divided by 1000) multiplied by the hours you use it and your rate per kWh. Switch to 'Cost to run an appliance', pick a device or type its wattage, set hours per day, and see the cost per day, month and year.

A kilowatt-hour (kWh) is the energy used by a 1000-watt appliance running for one hour. Utilities bill you per kWh, so kWh multiplied by your rate is the core of every electricity cost calculation.

Where do I find my electricity rate?

Your rate per kWh is printed on your utility bill, usually near the usage summary. Rates vary widely by region and plan, so enter your own rate for an accurate estimate rather than relying on a national average.

Free Electricity Bill Calculator — Estimate Your Bill & Appliance Cost

Energy used (kWh)

Rate (per kWh)

Fixed supply charge (optional)

Tax (optional %)

Billing period (days)

Don't know your kWh? Calculate it from meter readings

Previous reading

Current reading

Estimated bill — for this period

Energy cost — kWh × rate

Supply + tax — fixed charge + tax

Per day — average

Per year — at this rate

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.