Convert kcal to kW, or enter energy and time to find average power in W and kcal/h, with reverse conversion from kW, W, or MW on demand.
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kcal to kW Formula
Kilocalories measure energy. Kilowatts measure power. To convert, you need either a kcal rate (kcal per unit time) or a total kcal divided by a time.
For a total energy over a time period:
Reverse direction:
- kW — power in kilowatts
- kcal — energy in kilocalories (thermochemical, 1 kcal = 4184 J)
- kcal/h — energy rate in kilocalories per hour
- t — elapsed time in seconds
The calculator uses 1 kcal = 4184 J. The “large calorie” used in nutrition is the same unit as the kcal used here. If your source uses the International Table calorie (4186.8 J), the result differs by about 0.07 percent.
Reference Tables
Common direct conversions between kcal/h and kW:
| kcal/h | kW | W |
|---|---|---|
| 100 | 0.116222 | 116.222 |
| 500 | 0.581111 | 581.111 |
| 1,000 | 1.162222 | 1,162.222 |
| 2,500 | 2.905556 | 2,905.556 |
| 5,000 | 5.811111 | 5,811.111 |
| 10,000 | 11.622222 | 11,622.222 |
| 25,000 | 29.055556 | 29,055.556 |
| 100,000 | 116.222222 | 116,222.222 |
Illustrative energy-rate examples, not universal equipment or physiological ratings. Human entries denote metabolic energy, not mechanical output; actual values vary:
| Source | kcal/h | kW |
|---|---|---|
| Resting adult | 70 to 90 | 0.08 to 0.10 |
| Office worker, light activity | 100 to 150 | 0.12 to 0.17 |
| Cyclist, moderate | 500 to 700 | 0.58 to 0.81 |
| Small electric heater | 860 to 1,720 | 1 to 2 |
| Residential boiler | 17,000 to 26,000 | 20 to 30 |
| Commercial chiller | 86,100+ | 100+ |
Example
A heater is rated at 3,000 kcal/h. Find the power in kW.
kW = 3,000 × 4.184 / 3600 ≈ 3.49 kW
Cross-check using the energy form. In one hour, the heater delivers 3,000 kcal × 4184 J/kcal = 12,552,000 J. Dividing by 3,600 seconds gives 3,487 W, or 3.49 kW.
FAQ
Is kcal the same as Cal (food calorie)?
Yes. The “Calorie” on a nutrition label with a capital C equals one kilocalorie.
Why does kcal need a time to convert to kW?
A kilocalorie is energy. A kilowatt is energy per second. Without a time, the conversion is undefined. Choose Average power from total kcal and time in the solve-for selector when you only have a total kcal value.
What is the quick mental conversion?
Multiply kcal/h by 0.00116 to get kW, or divide kcal/h by 860 to get kW.
