Electricity Cost Calculator
Find the appliances eating your electric bill.
Electricity Cost Calculator
Cost = (Watts / 1000) x Hours x Days x Rate
Calculated instantly
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What This Calculator Does
The Electricity Cost Calculator estimates the monthly cost of any appliance from its wattage and usage pattern. It turns an opaque electric bill into per-device numbers you can act on.
How It Works
Wattage converts to kilowatt-hours by dividing by 1,000, then multiplying by daily hours, days per month, and your electricity rate. The result is that appliance contribution to the bill.
Example
A 1,200 W space heater running 2 hours daily for 30 days at R0.16/kWh uses 72 kWh and costs about R11.52 per month.
Formula
kWh = Watts / 1000 × Hours × DaysCost = kWh × Rate per kWhReading the Results
Energy Used
The appliance consumption in kilowatt-hours over the month.
Monthly Cost
That energy converted to money using your electricity rate.
Frequently Asked Questions
How do I find an appliance wattage?
Check the label plate on the back or bottom of the device, or look for a "W" rating. Many manuals list typical wattage too.
What is a kilowatt-hour?
A kilowatt-hour is 1,000 watts used for one hour. Your utility bills you per kWh consumed.
How do I find my electricity rate?
It appears on your electric bill as cents or dollars per kWh, often divided into supply and delivery charges that you can sum.