Convert Watt-hours to Calories

Converting Watt-hours (Wh) to Calories (cal) 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 860.421. Written as an equation: cal = Wh × 860.421.

One watt-hours equals approximately 860.42065 cal. This means you can multiply any Wh value by 860.42065 to get the equivalent in cal.

Worked example: 5 Wh = 4302.10325 cal. 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 cal conversions, or use the swap button to reverse the direction and convert cal back to Wh.