Calories to Watt Hours Converter

Summary

This tool converts thermochemical calories (cal) and kilocalories (kcal) into watt-hours (Wh) and kilowatt-hours (kWh). One thermochemical calorie equals exactly 4.184 joules, and one watt-hour equals 3,600 joules, so 1 cal = 4.184 / 3,600 Wh ≈ 0.001162 Wh. The conversion matters when comparing nutrition energy values with electrical energy consumption — for example, estimating how many food calories it would take to power a device. You can also reverse the direction and convert Wh or kWh back to cal or kcal.

How it works

1. Select whether your input is in calories (cal) or kilocalories (kcal).
2. Type a number into the input field.
3. The converter instantly shows the result in both watt-hours and kilowatt-hours.
4. Click the swap button to reverse: convert Wh or kWh back to cal or kcal.
5. Scroll down to the reference table for quick look-ups of common values.

Use cases

• Estimate how much electrical energy is equivalent to a food portion.
• Cross-check battery capacity specs against caloric energy equivalents.
• Physics or chemistry homework that mixes nutrition and electrical units.
• Compare metabolic energy output to device power consumption.
• Convert calorimeter measurements to watt-hour equivalents.
• Understand energy density of foods in electrical terms.

Frequently Asked Questions