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Convert electrical power (watts) into energy usage (watt-hours) quickly and accurately. Use this calculator for DC, AC, and battery-powered devices with time input.
To convert watts to watt-hours, multiply the power in watts by the time the device operates in hours. Watt-hours measure energy consumption, not just instantaneous power. Use this calculator to estimate battery life or electricity costs easily.
Watt-Hours (Wh) = Watts × Hours
TheWatts to Watt-Hours Calculatorlets you convert power in watts into energy in watt-hours by including the usage time in hours. This is especially useful to estimate battery life, energy consumption, and electricity costs. Just input the power rating and operating time, and get total energy used.
| Power (Watts) | Time (Hours) | Energy (Watt-Hours) |
|---|---|---|
| 100 W | 5 h | 500 Wh |
| 60 W | 10 h | 600 Wh |
| 150 W | 2.5 h | 375 Wh |
Watt-hour is a unit of energy representing power consumption over time.
Multiply watts by the number of hours the device runs.
No, watts measure power; watt-hours measure energy used over time.
Yes, watt-hours apply to all electrical devices.
It helps estimate battery capacity and runtime.
Use Watt-Hours = Watts × Hours.
No, this is theoretical energy use without losses.
Yes, it helps estimate daily or monthly energy output.
Use decimal values, e.g., 0.5 hours for 30 minutes.
Yes, fully responsive on all devices.
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