⚡
Instant result
The result is updated directly from the data entered.
Online Calculator
Energy Calculator
Enter power and operating time to calculate the energy consumed or produced.
Energy
2,000 Wh
Energy
2 kWh
Energy
7,200,000 J
Information
🔒
Local processing
The calculations are done in your browser without sending the values to a server.
💸
Free
No registration, subscription, or paid API required.
Frequently asked questions
What's the formula?
Energy = power × time.
What's the difference between W and Wh?
W measures power, while Wh measures energy accumulated over time.
Does it display kWh?
Yes.
Does it display joules?
Yes. A Wh equals 3600 joules.