Calculate how much any appliance costs to run, per day, month, and year. Enter the wattage, hours of use, and your electricity rate to see the true cost. Free and private.
The Electricity Cost Calculator shows what any appliance costs to run per day, month, and year from its wattage, hours of use, and your electricity rate. Appliance presets and any-currency support make it easy to find where your power bill actually goes.
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Enter an appliance's wattage, how long it runs, and your electricity rate (per kWh), and get the cost per hour, day, month, and year. It turns an abstract wattage on a label into a real number on your bill, the difference between guessing and knowing which device is quietly expensive.
Type the appliance's watts or pick a preset (AC, fridge, heater, PC).
Enter how many hours a day it runs.
Add your price per kWh in your currency.
View the cost per day, month, and year, plus kWh used.
Running the numbers on a space heater, old fridge, gaming PC, or always-on router shows where changing habits or hardware pays for itself. The formula is simple, kWh = watts × hours ÷ 1000, cost = kWh × rate, but doing it per device across a month is exactly what this calculator automates.
Multiply the appliance's power (watts) by hours used, divide by 1000 to get kilowatt-hours (kWh), then multiply by your electricity rate. For example, a 1500W heater running 5 hours = 7.5 kWh; at $0.15/kWh that's $1.13 per day. This tool does it instantly and projects monthly and yearly costs.
Your price per kWh is on your electricity bill (often called the 'unit rate' or 'energy charge'). Enter it in the rate field. Typical rates range from about $0.10 to $0.35 per kWh depending on your region.
Check the label on the device or its power supply, or use one of the built-in presets for common appliances. Motors and heaters draw the most; standby devices draw very little.
No. Everything is calculated locally in your browser and nothing is uploaded or saved.
Cost = (watts / 1000) x hours used x price per kWh. A 1500 W heater for 3 hours at $0.20/kWh costs 1.5 x 3 x 0.20 = $0.90. Enter the wattage, hours and your rate to see cost per hour, day, month and year.
Enter the device's wattage (a gaming PC is roughly 300-600 W, a window AC 900-1440 W) and your usage hours; the calculator multiplies by your kWh rate to estimate the running cost.
kWh = watts x hours / 1000. A 100 W bulb for 10 hours uses 100 x 10 / 1000 = 1 kWh. Multiply kWh by your rate to get the cost.
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