Convert Watt-hours to Kilocalories
1 watt-hour (Wh) equals 0.8604206501 kilocalories (kcal).
1 Wh = 0.8604206501 kcal
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk watt-hour to kilocalorie converter to paste a column from Excel.
How to Convert Watt-hour to Kilocalorie
- 1 Wh = 0.8604206501 kcal
- 1 kcal = 1.162222222 Wh
- Example: convert 15 Wh to kcal: 15 Wh = 15 × 0.8604206501 kcal = 12.90630975 kcal
Reference conditions. kcal: Thermochemical kilocalorie (food Calorie), 4184 J exactly.
Formula
kcal = Wh × 0.8604206500956
or kcal = Wh ÷ 1.162222222222
Derivation from SI units:
- 1 Wh = 1 W × 3600 s = 3600 J
- 1 kcal = 1000 cal = 4184 J (exact)
- 1 Wh = 3600 J ÷ 4184 J per kcal = 0.8604206500956 kcal
Both units are defined exactly, so the factor is exact. Watt-hour definition: watt-hour; Kilocalorie definition: kilocalorie.
Worked examples
- A reading of 20 Wh converts to 17.208413 kcal.
20 Wh × 0.8604206501 = 17.208413 kcal - A value of 100 Wh is 86.04206501 kcal.
100 Wh × 0.8604206501 = 86.04206501 kcal
Watt-hour to Kilocalorie conversion table
| Watt-hours (Wh) | Kilocalories (kcal) |
|---|---|
| 1 Wh | 0.8604206501 kcal |
| 5 Wh | 4.30210325 kcal |
| 10 Wh | 8.604206501 kcal |
| 15 Wh | 12.90630975 kcal |
| 20 Wh | 17.208413 kcal |
| 50 Wh | 43.0210325 kcal |
| 60 Wh | 51.62523901 kcal |
| 75 Wh | 64.53154876 kcal |
| 100 Wh | 86.04206501 kcal |
| 160 Wh | 137.667304 kcal |
| 500 Wh | 430.210325 kcal |
| 1000 Wh | 860.4206501 kcal |
Where it's used
Watt-hours are used for battery capacity (phone ≈ 15 Wh; airline limit 100 Wh per power bank), while kilocalories appear in food and diet energy (2000 kcal reference intake). Both measure energy, work and heat, so the conversion is a fixed factor.
Watt-hour to other energy units
| Conversion | 1 Wh equals |
|---|---|
| watt-hour to joule | 3600 J |
| watt-hour to kilojoule | 3.6 kJ |
| watt-hour to megajoule | 0.0036 MJ |
| watt-hour to calorie | 860.4206501 cal |
| watt-hour to kilocalorie | 0.8604206501 kcal |
| watt-hour to kilowatt-hour | 0.001 kWh |
| watt-hour to BTU | 3.412141633 BTU |
| watt-hour to therm | 0.00003412956341 thm |
| watt-hour to electronvolt | 2.246943267 × 10²² eV |
| watt-hour to foot-pound | 2655.223737 ft·lbf |
| watt-hour to erg | 36000000000 erg |
Frequently asked questions
How many kilocalories are in 1 watt-hour?
1 Wh = 0.8604206501 kcal.
How do I convert watt-hours to kilocalories?
Multiply the value in Wh by 0.8604206501, or divide it by 1.162222222. For example, 15 Wh × 0.8604206501 = 12.90630975 kcal.
Is the Wh to kcal conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "watt hour (W·h)".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "kilocalorie (thermochemical)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Watt-hours to Kilocalories. Retrieved October 17, 2026, from https://scientificconverters.com/energy/watt-hours-to-kilocalories/
IEEE
Scientific Converters, "Convert Watt-hours to Kilocalories," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/watt-hours-to-kilocalories/