Convert Watt-hours to Kilojoules

Whether you need to express a value in kJ instead of Wh, this guide walks you through the exact steps. Energy conversions connect food nutrition labels (calories), electricity bills (kWh), and scientific measurements in joules or BTU.

Formula: Multiply the watt-hours value by 3.6. In equation form: kJ = Wh × 3.6.

One watt-hours equals approximately 3.6 kJ. This means you can multiply any Wh value by 3.6 to get the equivalent in kJ.

For instance, converting 1 Wh gives 3.6 kJ. Try different values using the quick-value chips or type directly into the input field.

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 kJ conversions, or use the swap button to reverse the direction and convert kJ back to Wh.