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 ton of refrigeration?
A ton of refrigeration is a power unit measuring the heat removal capacity of cooling systems, equal to 12,000 BTU per hour. It is the standard capacity rating for commercial and industrial air conditioning units in the United States.
Real-world uses
The ton of refrigeration (TR) is used for rating commercial and industrial cooling systems, chillers, and large-scale HVAC equipment. A small commercial building might need a 20–100 TR chiller. Data centres measure cooling capacity in TR. One TR = 12,000 BTU/h = approximately 3.517 kW.
History
The ton of refrigeration originated in the 19th century ice trade, when mechanical refrigeration systems were judged by their ability to replace ice delivery. One ton was defined as the cooling equivalent of melting one ton of ice per day. As mechanical refrigeration displaced natural ice by the early 20th century, TR became a standard industrial cooling unit.
Common mistakes
Confusing refrigeration tons with metric tons of mass—they are completely unrelated. Also, the "ton" in TR originated from the cooling power needed to melt one short ton (2,000 lb) of ice in 24 hours, not from any mass being cooled.
When is this conversion used?
Converting between kilowatt and ton of refrigeration 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 = 0.28434514 ton of refrigeration
1 ton of refrigeration = 3,516.85284 watt
How to convert kilowatt to ton of refrigeration
To convert kilowatt to ton of refrigeration, multiply the value by 0.28434514.
To convert ton of refrigeration back to kilowatt, multiply by 3.51685284.
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 ton of refrigeration
| kilowatt | ton of refrigeration |
|---|---|
| 0.1 | 0.02843451 |
| 0.5 | 0.14217257 |
| 1 | 0.28434514 |
| 2 | 0.56869027 |
| 5 | 1.42172568 |
| 10 | 2.84345136 |
| 25 | 7.10862841 |
| 50 | 14.21725681 |
| 100 | 28.43451363 |
| 250 | 71.08628407 |
| 500 | 142.17256813 |
| 1,000 | 284.34513626 |
Common values
| kilowatt | ton of refrigeration | |
|---|---|---|
| LED light bulb | 0.01 kilowatt | 0.00284345 ton of refrigeration |
| Desktop computer | 0.3 kilowatt | 0.08530354 ton of refrigeration |
| Microwave oven | 1 kilowatt | 0.28434514 ton of refrigeration |
| Small car engine | 75 kilowatt | 21.32588522 ton of refrigeration |
| Wind turbine (large) | 3,000 kilowatt | 853.03540878 ton of refrigeration |
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.