Convert Milliwatts to Kilocalories per Hour
1 milliwatt (mW) equals 0.0008598452279 kilocalories per hour (kcal/h).
1 mW = 0.0008598452279 kcal/h
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk milliwatt to kilocalorie per hour converter to paste a column from Excel.
How to Convert Milliwatt to Kilocalorie per Hour
- 1 mW = 0.0008598452279 kcal/h
- 1 kcal/h = 1163 mW
- Example: convert 15 mW to kcal/h: 15 mW = 15 × 0.0008598452279 kcal/h = 0.01289767842 kcal/h
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
kcal/h = mW ÷ 1163
Derivation from SI units:
- 1 mW = 10⁻³ W
- 1 kcal_IT/h = 4186.8 J ÷ 3600 s = 1.163 W (exact)
- 1 mW = 0.001 W ÷ 1.163 W per kcal/h = 0.000859845227859 kcal/h
Both units are defined exactly, so the factor is exact. Milliwatt definition: milliwatt; Kilocalorie per Hour definition: kilocalorie per hour.
Worked examples
- A reading of 10 mW converts to 0.008598452279 kcal/h.
10 mW × 0.0008598452279 = 0.008598452279 kcal/h - A value of 200 mW is 0.1719690456 kcal/h.
200 mW × 0.0008598452279 = 0.1719690456 kcal/h
Milliwatt to Kilocalorie per Hour conversion table
| Milliwatts (mW) | Kilocalories per Hour (kcal/h) |
|---|---|
| 0.1 mW | 0.00008598452279 kcal/h |
| 1 mW | 0.0008598452279 kcal/h |
| 5 mW | 0.004299226139 kcal/h |
| 10 mW | 0.008598452279 kcal/h |
| 50 mW | 0.04299226139 kcal/h |
| 100 mW | 0.08598452279 kcal/h |
| 200 mW | 0.1719690456 kcal/h |
| 500 mW | 0.4299226139 kcal/h |
| 1000 mW | 0.8598452279 kcal/h |
Where it's used
Milliwatts are used for laser pointer and diode output, while kilocalories per hour appear in radiator and boiler ratings in older European data. Both measure power (energy per unit time), so the conversion is a fixed factor.
Milliwatt to other power units
| Conversion | 1 mW equals |
|---|---|
| milliwatt to watt | 0.001 W |
| milliwatt to kilowatt | 0.000001 kW |
| milliwatt to megawatt | 1 × 10⁻⁹ MW |
| milliwatt to horsepower | 0.00000134102209 hp |
| milliwatt to metric horsepower | 0.000001359621617 PS |
| milliwatt to BTU per hour | 0.003412141633 BTU/h |
| milliwatt to refrigeration ton | 2.843451361 × 10⁻⁷ TR |
| milliwatt to kilocalorie per hour | 0.0008598452279 kcal/h |
| milliwatt to foot-pound per second | 0.0007375621493 ft·lbf/s |
Frequently asked questions
How many kilocalories per hour are in 1 milliwatt?
1 mW = 0.0008598452279 kcal/h.
How do I convert milliwatts to kilocalories per hour?
Multiply the value in mW by 0.0008598452279, or divide it by 1163. For example, 15 mW × 0.0008598452279 = 0.01289767842 kcal/h.
Is the mW to kcal/h 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
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- 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.
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 Milliwatts to Kilocalories per Hour. Retrieved October 17, 2026, from https://scientificconverters.com/power/milliwatts-to-kilocalories-per-hour/
IEEE
Scientific Converters, "Convert Milliwatts to Kilocalories per Hour," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/power/milliwatts-to-kilocalories-per-hour/