Convert Kilocalories to Watt-hours
1 kilocalorie (kcal) equals 1.162222222 watt-hours (Wh).
1 kcal = 1.162222222 Wh
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilocalorie to watt-hour converter to paste a column from Excel.
How to Convert Kilocalorie to Watt-hour
- 1 kcal = 1.162222222 Wh
- 1 Wh = 0.8604206501 kcal
- Example: convert 15 kcal to Wh: 15 kcal = 15 × 1.162222222 Wh = 17.43333333 Wh
Reference conditions. kcal: Thermochemical kilocalorie (food Calorie), 4184 J exactly.
Formula
Wh = kcal × 1.162222222222
Derivation from SI units:
- 1 kcal = 1000 cal = 4184 J (exact)
- 1 Wh = 1 W × 3600 s = 3600 J
- 1 kcal = 4184 J ÷ 3600 J per Wh = 1.162222222222 Wh
Both units are defined exactly, so the factor is exact. Kilocalorie definition: kilocalorie; Watt-hour definition: watt-hour.
Worked examples
- A reading of 200 kcal converts to 232.4444444 Wh.
200 kcal × 1.162222222 = 232.4444444 Wh - A value of 1500 kcal is 1743.333333 Wh.
1500 kcal × 1.162222222 = 1743.333333 Wh
Kilocalorie to Watt-hour conversion table
| Kilocalories (kcal) | Watt-hours (Wh) |
|---|---|
| 1 kcal | 1.162222222 Wh |
| 50 kcal | 58.11111111 Wh |
| 100 kcal | 116.2222222 Wh |
| 150 kcal | 174.3333333 Wh |
| 200 kcal | 232.4444444 Wh |
| 250 kcal | 290.5555556 Wh |
| 300 kcal | 348.6666667 Wh |
| 500 kcal | 581.1111111 Wh |
| 1000 kcal | 1162.222222 Wh |
| 1500 kcal | 1743.333333 Wh |
| 2000 kcal | 2324.444444 Wh |
| 2500 kcal | 2905.555556 Wh |
| 3000 kcal | 3486.666667 Wh |
| 3500 kcal | 4067.777778 Wh |
Where it's used
Kilocalories are used for food and diet energy (2000 kcal reference intake), while watt-hours appear in battery capacity (phone ≈ 15 Wh; airline limit 100 Wh per power bank). Both measure energy, work and heat, so the conversion is a fixed factor.
Kilocalorie to other energy units
| Conversion | 1 kcal equals |
|---|---|
| kilocalorie to joule | 4184 J |
| kilocalorie to kilojoule | 4.184 kJ |
| kilocalorie to megajoule | 0.004184 MJ |
| kilocalorie to calorie | 1000 cal |
| kilocalorie to watt-hour | 1.162222222 Wh |
| kilocalorie to kilowatt-hour | 0.001162222222 kWh |
| kilocalorie to BTU | 3.965666831 BTU |
| kilocalorie to therm | 0.00003966613703 thm |
| kilocalorie to electronvolt | 2.611447397 × 10²² eV |
| kilocalorie to foot-pound | 3085.960033 ft·lbf |
| kilocalorie to erg | 41840000000 erg |
Frequently asked questions
How many watt-hours are in 1 kilocalorie?
1 kcal = 1.162222222 Wh.
How do I convert kilocalories to watt-hours?
Multiply the value in kcal by 1.162222222. For example, 15 kcal × 1.162222222 = 17.43333333 Wh.
Is the kcal to Wh 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, "kilocalorie (thermochemical)".
- 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)".
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 Kilocalories to Watt-hours. Retrieved October 17, 2026, from https://scientificconverters.com/energy/kilocalories-to-watt-hours/
IEEE
Scientific Converters, "Convert Kilocalories to Watt-hours," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/kilocalories-to-watt-hours/