⚡ Energy Cost Calculator
Enter an appliance's wattage, how long you run it, and your electricity rate to see the cost per day, month, and year.
⚡ Appliance & Rate
What is an Energy Cost Calculator?
It puts a dollar figure on running any appliance. From its wattage, daily run time, and your electricity rate, it works out how much energy the device uses and what that costs per day, month, and year — turning an abstract watt rating into numbers you can compare and budget around.
Use it to find the true annual cost of a space heater, spot always-on devices quietly padding your bill, and judge whether an efficient replacement pays for itself. The figures cover one appliance's energy — your full bill also reflects fixed charges, taxes, and tariffs.
❓ Frequently Asked Questions
How is the running cost calculated?
It converts the appliance's wattage to kilowatts (watts ÷ 1,000) and multiplies by the hours you run it each day to get kilowatt-hours per day. That daily energy times your price per kWh gives the daily cost, which is scaled by your billing days for the monthly figure and by 365 for the yearly figure.
Where do I find an appliance's wattage and my rate?
Wattage is usually printed on the appliance's rating label, in its manual, or on the power supply; for heating and cooling devices it's often 1,000 to 1,500 watts. Your electricity rate per kilowatt-hour is on your utility bill — use the total cost per kWh including delivery charges for the most realistic estimate.
Why is my real bill higher than this estimate?
This tool prices the energy one device uses. Your actual bill also includes fixed service charges, taxes, tiered or time-of-use rates, and every other appliance in the home. Devices on standby or in an always-on mode draw power beyond their active hours too, so treat the result as a per-appliance guide, not a whole-home total.
How can I use it to save money?
Compare the yearly cost of an old appliance against a more efficient replacement to see the payback, spot the 'energy vampires' worth switching off, and test how cutting daily run time changes the total. Small always-on devices and heating or cooling loads usually offer the biggest savings.