Electricity Cost Calculator
Calculate what appliances cost to run — per day, month and year.
kWh/day · kWh/year
How to use Electricity Cost Calculator
- Enter the wattage — from the appliance label, or a plug-in power meter for real numbers.
- Enter daily usage hours — 24 for always-on devices like fridges and routers.
- Enter your rate per kWh — your bill's total ÷ kWh used gives the true all-in rate.
- Read daily/monthly/yearly costs — the yearly column is what ranks your energy hogs.
What is Electricity Cost Calculator?
An electricity cost calculator turns an appliance's power draw into money: Cost = watts ÷ 1,000 × hours × price per kWh. A 2,000 W heater running 5 hours daily at $0.17/kWh costs 2 × 5 × 0.17 = $1.70/day — $51/month. The kilowatt-hour is the billing unit: one kWh runs a 100 W device for 10 hours.
The intuition it fixes: cost = power × time, so a big number on the label only matters multiplied by hours. A 2,000 W kettle used 10 minutes a day costs pennies; a 100 W device running around the clock quietly outspends it — duty cycle beats wattage.
About the Electricity Cost Calculator
Enter the appliance's wattage (from its label or a plug-in meter), its daily hours, and your electricity rate, and read the daily, monthly and yearly cost.
The household league table it reveals: heating and cooling dominate (a space heater at 1,500 W × 8 h is ~$60/month; AC similar), then water heating, tumble dryers (~3,000 W per load) and old refrigerators (24/7 duty makes even 150 W add up ~$18/month). The sleepers: always-on electronics — a gaming PC idling, set-top boxes, that second fridge in the garage — where 24/7 turns small watts into real money ($1/year per always-on watt at ~$0.11/kWh; more at higher rates).
Find your rate on the bill (total ÷ kWh used beats the advertised base rate, since it captures fees); typical US rates run $0.12–0.30/kWh by state, European rates often €0.25–0.40. Then audit: measure suspects, multiply, and let the yearly column prioritize what to fix.