Watt to kWh Calculator
Convert power in watts to energy in kilowatt-hours over a given time.
About the Watt to kWh Calculator
If you have ever wanted a fast, reliable Watt to kWh Calculator that works on your phone without sign-ups or ads getting in the way, this is it — the figures update the moment you type.
Energy comes in many units — joules, watt-hours, calories, BTU, and the kilowatt-hours on your electricity bill. This Watt to kWh Calculator converts between them so you can compare energy figures from different sources.
The conversion applies the exact factors between energy units, and because one kilowatt-hour equals 3.6 million joules, the calculator saves you from unwieldy manual math.
Pakistani households meet these units everywhere: electricity bills in kWh, gas bills in cubic metres or MMBTU, and appliance specs in watts. Converting between them is how you compare energy costs across fuel types.
The converter is the companion to this site's appliance and bill calculators — convert any figure to kWh and you can price it against your tariff.
Bookmark the Watt to kWh Calculator for the next time you need it, and explore the rest of GuruAlpha's 1,200+ calculators for related everyday maths.
How to convert energy units
- 1
Enter the energy value in the unit you have.
- 2
Select the unit to convert to.
- 3
Read the converted value, updated live.
Frequently Asked Questions
How do I convert watts to kWh?
Multiply watts by hours and divide by 1,000: 2,000 W × 3 h ÷ 1,000 = 6 kWh.
How many kWh are in a joule?
One kilowatt-hour equals 3.6 million joules. Conversely, 1 joule is 0.000000278 kWh — tiny, which is why bills are in kWh rather than joules.