Calculate electricity costs for any appliance. Convert watts to cost per hour, day, month, and year. Perfect for understanding your energy consumption.
Quick Calculations
Common energy cost calculations answered instantly:
Watt to Cost Calculator
Amp to Watt Calculator
Frequently Asked Questions
At the average US electricity rate of $0.15/kWh, 240 watts costs:
- Per hour: $0.036 (3.6 cents)
- Per day (24 hours): $0.86
- Per month (30 days): $25.92
Formula: (Watts ÷ 1000) × Hours × Cost per kWh
1.5 kWh at $0.15/kWh costs $0.225 (22.5 cents).
To put this in perspective:
- Running a 1500W heater for 1 hour uses 1.5 kWh
- Running a 100W TV for 15 hours uses 1.5 kWh
- Running a 10W LED bulb for 150 hours uses 1.5 kWh
To calculate cost from amps:
- Convert amps to watts: Watts = Amps × Volts × Power Factor
- Convert watts to kilowatts: kW = Watts ÷ 1000
- Calculate energy used: kWh = kW × Hours
- Calculate cost: Cost = kWh × Cost per kWh
Example: A 10A device at 120V running for 3 hours at $0.15/kHz:
Watts = 10A × 120V × 1.0 = 1200W = 1.2kW
Energy = 1.2kW × 3h = 3.6kWh
Cost = 3.6kWh × $0.15 = $0.54
Disclaimer: This calculator provides estimates based on the inputs provided. Actual electricity costs may vary based on your location, time-of-use rates, tiered pricing, taxes, and utility fees. Always refer to your electricity bill for accurate rate information.
Formula: Cost = (Watts × Hours ÷ 1000) × Cost per kWh
