Electricity Cost Calculator
Calculate how much any appliance or device costs to run. Find daily, monthly, and annual electricity costs based on wattage and usage.
W
hrs
$ /kWh
Monthly Cost (30 days)
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Daily Cost —
Annual Cost —
How to Use This Calculator
- Find the Wattage of your device on its label or in the manual.
- Enter how many Hours per Day you use it.
- Enter your Electricity Rate from your utility bill ($/kWh).
- The calculator shows daily, monthly, and annual running costs.
Formula
kWh per Day = (Wattage / 1000) × Hours per Day
Daily Cost = kWh per Day × Price per kWh
Monthly Cost = Daily Cost × 30
Example
A 100W light bulb used 5 hours/day at $0.13/kWh.
- kWh/day = (100/1000) × 5 = 0.5 kWh
- Daily Cost = 0.5 × $0.13 = $0.065
- Monthly Cost = $0.065 × 30 = $1.95
Frequently Asked Questions
- Energy (kWh) = Wattage / 1000 × Hours Used. Cost = Energy (kWh) × Price per kWh. For example, a 100W bulb running 5 hours uses 0.5 kWh, costing $0.065 at $0.13/kWh.
- Check your utility bill for the rate in cents per kWh. The US national average is around $0.12–$0.16/kWh, but it varies significantly by state and provider.
- A typical 55-inch LED TV uses about 100W. Running 8 hours/day at $0.13/kWh costs about $0.10/day or $3.12/month.
- Heating and cooling (HVAC) typically account for 40–50% of home electricity use. Water heaters, washers/dryers, and refrigerators are the next biggest consumers.