Convert Kilocalories per Hour to Milliwatts
1 kilocalorie per hour (kcal/h) equals 1163 milliwatts (mW).
1 kcal/h = 1163 mW
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilocalorie per hour to milliwatt converter to paste a column from Excel.
How to Convert Kilocalorie per Hour to Milliwatt
- 1 kcal/h = 1163 mW
- 1 mW = 0.0008598452279 kcal/h
- Example: convert 15 kcal/h to mW: 15 kcal/h = 15 × 1163 mW = 17445 mW
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
mW = kcal/h × 1163
Derivation from SI units:
- 1 kcal_IT/h = 4186.8 J ÷ 3600 s = 1.163 W (exact)
- 1 mW = 10⁻³ W
- 1 kcal/h = 1.163 W ÷ 0.001 W per mW = 1163 mW
Both units are defined exactly, so the factor is exact. Kilocalorie per Hour definition: kilocalorie per hour; Milliwatt definition: milliwatt.
Worked examples
- A reading of 1000 kcal/h converts to 1163000 mW.
1000 kcal/h × 1163 = 1163000 mW - A value of 10000 kcal/h is 11630000 mW.
10000 kcal/h × 1163 = 11630000 mW
Kilocalorie per Hour to Milliwatt conversion table
| Kilocalories per Hour (kcal/h) | Milliwatts (mW) |
|---|---|
| 100 kcal/h | 116300 mW |
| 500 kcal/h | 581500 mW |
| 860 kcal/h | 1000180 mW |
| 1000 kcal/h | 1163000 mW |
| 2000 kcal/h | 2326000 mW |
| 5000 kcal/h | 5815000 mW |
| 10000 kcal/h | 11630000 mW |
| 20000 kcal/h | 23260000 mW |
| 50000 kcal/h | 58150000 mW |
Where it's used
Kilocalories per Hour are used for radiator and boiler ratings in older European data, while milliwatts appear in laser pointer and diode output. Both measure power (energy per unit time), so the conversion is a fixed factor.
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 milliwatts are in 1 kilocalorie per hour?
1 kcal/h = 1163 mW.
How do I convert kilocalories per hour to milliwatts?
Multiply the value in kcal/h by 1163. For example, 15 kcal/h × 1163 = 17445 mW.
Is the kcal/h to mW conversion exact?
Yes. Both units are defined exactly, and 1 kcal/h is exactly 1163 mW.
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 7, SI prefixes.
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 Milliwatts. Retrieved October 17, 2026, from https://scientificconverters.com/power/kilocalories-per-hour-to-milliwatts/
IEEE
Scientific Converters, "Convert Kilocalories per Hour to Milliwatts," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/power/kilocalories-per-hour-to-milliwatts/