Convert Watt-hours to Joules

Converting Watt-hours (Wh) to Joules (J) is a common task in energy measurements. Energy conversions connect food nutrition labels (calories), electricity bills (kWh), and scientific measurements in joules or BTU.

To convert, multiply the watt-hours value by 3600. Written as an equation: J = Wh × 3600.

One watt-hours equals approximately 3600 J. This means you can multiply any Wh value by 3600 to get the equivalent in J.

Worked example: 25 Wh = 90000 J. Enter your own value in the converter above for instant results.

Common mistake: Food calories on nutrition labels are actually kilocalories (kcal), which confuses many people when comparing to joules or watt-hours.

Bookmark this page for quick Wh to J conversions, or use the swap button to reverse the direction and convert J back to Wh.