Electricity Cost Calculator: Appliances & Monthly Bill

Each band of units is charged at its own rate, for example the first 100 units at one price and the next 100 at a higher price. Enter each slab's limit and rate.

An inverter AC averaging 1,300 W for 8 hours uses about 10.4 kWh a day, roughly 316 kWh a month. Multiply by your unit price.

Power used by devices that are off but plugged in. A few watts per device adds up over a year; the calculator shows its yearly cost.

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.