kW to Ton Calculator
Evaluate cooling capacity in tons of refrigeration (TR) from kilowatts (kW), or convert refrigeration tonnage back to active power kW. Settle thermal systems dynamically.
kW to Ton Converter
How to Use the kW to Ton Calculator
Converting heating or cooling capacity in kilowatts (kW) to tons of refrigeration (TR) is direct.
- 1Enter Power: Input the heat transfer rate in kilowatts (kW) into the designating field.
- 2Calculate: Click the "Calculate to Ton" button to run the conversion.
How to Convert kW to Ton
In heating, ventilation, and air conditioning (HVAC) applications, kilowatts (kW) and tons of refrigeration (TR) are the primary units used to specify thermal capacity. Kilowatts represent the metric unit of heat transfer rate, while a ton of refrigeration is an imperial measure reflecting the cooling effect generated by melting one short ton (2000 lbs) of ice at 0 degrees Celsius over a 24-hour period. Sizing building central chillers, room air conditioners, and cooling towers requires converting thermal kW to tons of refrigeration. To find the refrigeration tonnage, divide the active thermal capacity in kilowatts by the thermal conversion factor of 3.517 kW per ton of refrigeration.
Real-Life Sizing Scenarios
Scenario 1: Sizing Industrial Chillers
An HVAC engineer sizes the refrigeration tonnage required for an industrial process chiller rated to extract 50 kW of thermal cooling load. Sizing the equivalent cooling capacity in tons:
Tons (TR) = 50 kW ÷ 3.517 = 14.22 TR
Scenario 2: Sizing Server Room Cooling Extraction Setup
A server rack cooling extraction duct draws 10 kW of heat away from components. Sizing the minimum heat pump cooling capacity:
Tons (TR) = 10 kW ÷ 3.517 = 2.84 TR
Step-by-Step Manual Sizing Guide
- 1Identify thermal load: Settle the thermal heat extraction rate in kilowatts (kW).
- 2Apply kW to Ton Formula: Write:
Tons = kW ÷ 3.517. - 3Solve the calculation: Divide by 3.517 to get the capacity in tons of refrigeration (TR).
kW to Ton Conversion Chart
The table below displays standard thermal power ratings in kW and their equivalent cooling capacities in tons of refrigeration (TR):
| Power (kW) | Cooling Capacity (Tons TR) |
|---|---|
| 4.5 kW | 1.28 TR |
| 5.0 kW | 1.42 TR |
| 5.6 kW | 1.59 TR |
| 7.1 kW | 2.02 TR |
| 10.0 kW | 2.84 TR |
| 12.5 kW | 3.55 TR |
| 25.0 kW | 7.11 TR |
| 50.0 kW | 14.22 TR |
7.1 kW to Tons
Converting a standard commercial air conditioner rating of 7.1 kW to refrigeration tonnage:
Tons = 7.1 kW ÷ 3.517 = 2.02 TR
kW to Ton Formula
The standard thermodynamic conversion formula dividing active thermal kilowatts (kW) by the refrigeration constant to isolate tons of refrigeration:
TR = kW ÷ 3.517
5.6 kW to Ton
Sizing the refrigeration tonnage matching a 5.6 kW ductless mini-split cooling rating:
Tons = 5.6 kW ÷ 3.517 = 1.59 TR
5 kW to Ton
Converting a standard room cooling load of 5 kW to tons of refrigeration capacity:
Tons = 5 kW ÷ 3.517 = 1.42 TR
50 kW to Tons
Sizing the refrigeration capacity limit for an industrial water chiller extracting 50 kW of heat:
Tons = 50 kW ÷ 3.517 = 14.22 TR
4.5 kW to Ton
Sizing the refrigeration tonnage equivalent to a 4.5 kW heat pump cooling load:
Tons = 4.5 kW ÷ 3.517 = 1.28 TR
10 kW to Ton
Converting a commercial space ventilation cooling capacity of 10 kW to refrigeration tons:
Tons = 10 kW ÷ 3.517 = 2.84 TR
12.5 kW to Ton
Sizing the refrigeration capacity equivalent to a 12.5 kW chiller heat extraction load:
Tons = 12.5 kW ÷ 3.517 = 3.55 TR
Frequently Asked Questions (FAQs)
One ton of refrigeration (TR) is defined as 12,000 BTU/h, which equals approximately 3.517 kilowatts (kW) of heat transfer rate. This means that a cooling system rated at 1 ton of refrigeration is capable of extracting approximately 3.517 kilojoules of heat energy per second from a space. Sizing room air conditioners, industrial water chillers, and large building air handling units relies on this unit conversion standard.
To convert active thermal power in kilowatts (kW) to cooling capacity in tons of refrigeration (TR), divide the kilowatt value by the constant conversion factor of 3.517: Tons = kW ÷ 3.517. For example, if a commercial ductless mini-split system is rated at 14 kW of cooling capacity, its equivalent tonnage is calculated as: 14 ÷ 3.517 = 3.98 Tons (which is typically rounded to a standard 4-ton unit).
In standard HVAC and refrigeration systems, there is approximately 3.517 kW of cooling or heating capacity per refrigeration ton (TR). When converting thermal heat pump loads, engineers use this thermodynamic constant to verify that auxiliary components can handle the total energy extraction rate during peak cooling operations.
Yes, our free online kW to Ton Calculator serves as a fast interactive tool to toggle dynamically between kilowatts (kW) and refrigeration tonnage (TR) without changing page URLs. It computes values instantly for single systems, central residential air conditioners, and large industrial process chillers.
A 2 Ton air conditioning unit is equivalent to about 7.03 kW of thermal cooling capacity. Settle this manually by multiplying the tonnage rating by 3.517: 2 TR × 3.517 = 7.03 kW. This is the cooling output; the electrical input is much lower (roughly cooling kW divided by the COP).
A 3 Ton air conditioning unit is equivalent to about 10.55 kW of thermal cooling capacity. To calculate this manually, multiply the refrigeration tonnage value by the cooling factor of 3.517: 3 TR × 3.517 = 10.55 kW. Standard multi-room residential split units are frequently rated at 3 tons to extract this amount of heat.
