Energy Cost Calculator
W
hrs
$/kWh
$
—
$
—
$
—
—
kWh
Formula: Cost = (Watts / 1000) × Hours × Rate
Energy Cost Calculator
Understanding energy costs helps you manage electricity bills and make informed decisions about appliance usage.
Conversion Formula
Cost = (Watts / 1000) × Hours × Rate
Energy cost = (watts ÷ 1000) × hours × rate per kWh.
Step-by-Step Examples
1000W, 8hrs, $0.12/kWh = $0.96/day
(1000/1000) × 8 × 0.12 = $0.96
60W, 10hrs, $0.15/kWh = $0.09/day
(60/1000) × 10 × 0.15 = $0.09
Frequently Asked Questions
How do I calculate electricity cost?
Multiply the wattage by hours of use to get watt-hours, divide by 1000 to get kWh, then multiply by your electricity rate.
What is the average electricity rate?
The US average is about $0.12-0.16 per kWh, but rates vary widely by state and provider.
How much does it cost to run a 1000W heater?
At $0.12/kWh, running a 1000W heater for 8 hours costs about $0.96 per day or ~$29 per month.