What is kilowatt?
A kilowatt is a unit of power equal to 1,000 watts. It is commonly used to rate electric motors, heating systems, solar panels, EV chargers, and industrial equipment.
Real-world uses
Kilowatts are used for rating home electrical systems, electric vehicle charging speeds (Level 2 chargers: 7–22 kW), solar panel array output, electric motors in appliances, and small generators. A typical household may have a peak demand of 3–10 kW.
History
As electricity supply systems expanded in the late 19th century, the kilowatt became the practical unit for measuring power demands and generation capacities beyond the range of single watts. Its adoption enabled standardised rating of motors, generators, and electrical infrastructure.
Common mistakes
Confusing kilowatts (kW, power) with kilowatt-hours (kWh, energy). A 7 kW EV charger running for 2 hours delivers 14 kWh of energy. Also, mixing up kW and kVA in electrical specifications—kVA is apparent power, not real power.
What is kilocalorie per hour?
Kilocalorie per hour is a unit of power expressing energy transfer as dietary calories per hour. It is used in nutrition and exercise physiology to express the rate of energy expenditure during physical activity.
Real-world uses
Kilocalories per hour (kcal/h) are used in exercise physiology to express metabolic power output (a brisk walk burns about 300 kcal/h, cycling about 500–800 kcal/h), and in HVAC engineering in Asia and Latin America to rate heating and cooling equipment, where it bridges nutritional and thermal engineering contexts.
History
The kilocalorie per hour emerged as a natural unit at the intersection of nutritional science and physiology, where metabolic rates had long been expressed in food energy per unit time. In HVAC contexts, it provided a familiar scale for countries where kilocalories were the customary energy unit before SI adoption.
Common mistakes
Confusing kcal/h (power) with kcal (energy). A person burning 300 kcal/h for 2 hours has expended 600 kcal, not 300 kcal. Also, mixing up kcal/h with kJ/h: 1 kcal/h = 4.184 kJ/h ≈ 1.163 W.
When is this conversion used?
Converting between kilowatt and kilocalorie per hour is common when working across metric and imperial systems, such as international trade, travel between countries with different measurement standards, or following instructions from a different region.
Worked examples
1 kilowatt = 859.84522786 kilocalorie per hour
1 kilocalorie per hour = 1.163 watt
How to convert kilowatt to kilocalorie per hour
To convert kilowatt to kilocalorie per hour, multiply the value by 859.84522786.
To convert kilocalorie per hour back to kilowatt, multiply by 0.001163.
Measurement standards
The watt is the SI derived unit of power, defined as one joule per second (kg·m²/s³). Horsepower remains in widespread informal use, particularly in the automotive industry, but has no single universal definition across regions.
Did you know?
The human body at rest produces about 80 watts of power — roughly enough to keep an incandescent light bulb glowing. During intense exercise, a trained cyclist can sustain over 400 watts, and elite sprinters briefly exceed 2,000 watts.
Quick reference: kilowatt to kilocalorie per hour
| kilowatt | kilocalorie per hour |
|---|---|
| 0.1 | 85.98452279 |
| 0.5 | 429.92261393 |
| 1 | 859.84522786 |
| 2 | 1,719.69045572 |
| 5 | 4,299.22613929 |
| 10 | 8,598.45227859 |
| 25 | 21,496.13069647 |
| 50 | 42,992.26139295 |
| 100 | 85,984.5227859 |
| 250 | 214,961.30696475 |
| 500 | 429,922.61392949 |
| 1,000 | 859,845.22785899 |
Common values
| kilowatt | kilocalorie per hour | |
|---|---|---|
| LED light bulb | 0.01 kilowatt | 8.59845228 kilocalorie per hour |
| Desktop computer | 0.3 kilowatt | 257.95356836 kilocalorie per hour |
| Microwave oven | 1 kilowatt | 859.84522786 kilocalorie per hour |
| Small car engine | 75 kilowatt | 64,488.39208942 kilocalorie per hour |
| Wind turbine (large) | 3,000 kilowatt | 2,579,535.68357696 kilocalorie per hour |
Available Power units
More kilowatt conversions
- Convert kilowatt to watt
- Convert kilowatt to horsepower (mechanical)
- Convert kilowatt to megawatt
- Convert kilowatt to gigawatt
- Convert kilowatt to milliwatt
- Convert kilowatt to microwatt
- Convert kilowatt to BTU per hour
- Convert kilowatt to kilocalorie per hour
- Convert kilowatt to ton of refrigeration
Assumption: horsepower values use mechanical horsepower.