Convert Kilocalories per Hour to Watts
1 kilocalorie per hour (kcal/h) equals 1.163 watts (W).
1 kcal/h = 1.163 W
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilocalorie per hour to watt converter to paste a column from Excel.
How to Convert Kilocalorie per Hour to Watt
- 1 kcal/h = 1.163 W
- 1 W = 0.8598452279 kcal/h
- Example: convert 15 kcal/h to W: 15 kcal/h = 15 × 1.163 W = 17.445 W
Reference conditions. kcal/h: Uses the International Table kilocalorie (4186.8 J), the convention in heating and HVAC: 1 kcal/h = 1.163 W.
Formula
W = kcal/h × 1.163
Derivation from SI units:
- 1 kcal_IT/h = 4186.8 J ÷ 3600 s = 1.163 W (exact)
- 1 W = 1 J/s = 1 kg·m²·s⁻³
Both units are defined exactly, so the factor is exact. Kilocalorie per Hour definition: kilocalorie per hour; Watt definition: watt.
Worked examples
- 860 kcal/h is almost exactly 1000.18 W.
860 kcal/h × 1.163 = 1000.18 W - A 5000 kcal/h radiator output is 5815 W.
5000 kcal/h × 1.163 = 5815 W
Kilocalorie per Hour to Watt conversion table
| Kilocalories per Hour (kcal/h) | Watts (W) |
|---|---|
| 100 kcal/h | 116.3 W |
| 500 kcal/h | 581.5 W |
| 860 kcal/h | 1000.18 W |
| 1000 kcal/h | 1163 W |
| 2000 kcal/h | 2326 W |
| 5000 kcal/h | 5815 W |
| 10000 kcal/h | 11630 W |
| 20000 kcal/h | 23260 W |
| 50000 kcal/h | 58150 W |
Where it's used
Older European radiator and boiler outputs in kcal/h are converted to watts. With the International Table calorie, 1 kcal/h = 1.163 W exactly.
Kilocalorie per Hour to other power units
| Conversion | 1 kcal/h equals |
|---|---|
| kilocalorie per hour to watt | 1.163 W |
| kilocalorie per hour to milliwatt | 1163 mW |
| kilocalorie per hour to kilowatt | 0.001163 kW |
| kilocalorie per hour to megawatt | 0.000001163 MW |
| kilocalorie per hour to horsepower | 0.00155960869 hp |
| kilocalorie per hour to metric horsepower | 0.001581239941 PS |
| kilocalorie per hour to BTU per hour | 3.968320719 BTU/h |
| kilocalorie per hour to refrigeration ton | 0.0003306933933 TR |
| kilocalorie per hour to foot-pound per second | 0.8577847796 ft·lbf/s |
Frequently asked questions
How many watts is 1 kcal/h?
Exactly 1.163 W (International Table calorie).
How many watts are in 1 kilocalorie per hour?
1 kcal/h = 1.163 W.
How do I convert kilocalories per hour to watts?
Multiply the value in kcal/h by 1.163. For example, 15 kcal/h × 1.163 = 17.445 W.
Is the kcal/h to W conversion exact?
Yes. Both units are defined exactly, and 1 kcal/h is exactly 1.163 W.
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, "calorie_IT" with hour.
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, coherent derived units with special names.
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 per Hour to Watts. Retrieved October 17, 2026, from https://scientificconverters.com/power/kilocalories-per-hour-to-watts/
IEEE
Scientific Converters, "Convert Kilocalories per Hour to Watts," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/power/kilocalories-per-hour-to-watts/