Watt-Hour Calculator
Your details
Calculation mode
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Choose how you want to calculate. "Watts x time" covers appliances and devices. "Volts x Ah" converts battery ratings. "Battery runtime" tells you how long a battery lasts at a given load.
Watts x time (energy consumed)
Volts x amp-hours (battery capacity)
Battery runtime (Wh / Watts)
Power
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The rated power of the device in watts. Check the label or spec sheet.
W
Time used
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How many hours the device runs per day (or per session).
h
Electricity rate
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Your utility rate per kilowatt-hour. The US average is about $0.16/kWh; check your bill for your exact figure.
USD/kWh
Days used per month
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Used to project monthly electricity cost.
days
Reset
Energy
480
Wh
Energy in watt-hours
Kilowatt-hours
0.48
kWh
Daily electricity cost
0.0768
USD
Monthly cost
2.3
USD
Watt-hours (Wh)
480
Kilowatt-hours x 100
0.48
▸
Energy: 480.0 Wh (0.4800 kWh)
Running a 60 W device for 8 h uses 480.0 Wh, which is 0.480 kWh.
At $0.16/kWh that costs about $2.30 per month.
Compare the watt-hours to your battery bank or solar panel output to see how many hours of sun you need to offset this load.
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