kcal/hr to TR Converter
Use this kcal/hr to TR Converter to turn a stated cooling rate into refrigeration tons: divide kcal/hr by 3,024 for the common HVAC convention. For tender or equipment data, confirm the source's calorie basis before finalising.
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Keep HVAC Capacity Checks Connected to Project Work
A conversion is only one part of the job. DuctArchitect helps contractors keep equipment records, project documents, material requirements and quotations together after capacity values have been checked.
Relevant DuctArchitect Features
Project Files & Activity: Keep the source sheet and related HVAC project documents in one place.
BOQ & BOM: Keep quantities and material requirements tied to the project plan.
Item Catalog: Review equipment model and item details while preparing a quote.
Professional Quotations: Use consistent quote details after checking the stated cooling capacity.
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kcal/hr to TR formula
TR = kcal/hr × 0.00033069339
kcal/hr = TR ÷ 0.00033069339
The factor is 0.00033069339 TR for each 1 kcal/hr. Going the other way, 1 TR is 3,023.9491 kcal/hr.
kcal/hr to TR reference table
| kcal/hr | TR |
|---|---|
| 3,000 | 0.99208 |
| 6,000 | 1.98416 |
| 9,000 | 2.97624 |
| 15,000 | 4.9604 |
| 30,000 | 9.9208 |
| 60,000 | 19.8416 |
| 90,000 | 29.7624 |
| 150,000 | 49.604 |
| 300,000 | 99.208 |
Where this conversion is used
Older heat load sheets, boiler and burner data, and some chiller and cooling tower catalogues in India give capacity in kcal/hr. Project schedules and tender documents usually want TR, which many people call tons. Use this conversion when you bring a kcal/hr figure from an older calculation or a manufacturer's data sheet into a schedule based on TR. The page uses the International Table kilocalorie and the US refrigeration ton.
Worked example
The data plate on an existing chiller shows a capacity of 45,000 kcal/hr and the replacement tender asks for capacity in TR.
45,000 kcal/hr × 0.00033069339 = 14.8812 TR
The existing chiller is rated at about 14.88 TR.
Common mistakes
- Confusing kcal with cal. 1 kcal is 1,000 cal, and catalogue figures are almost always in kcal/hr.
- Using a rounded 3,000 kcal/hr per TR. It is a common site shortcut and it overstates the TR figure slightly.
- Mixing heat rejection with cooling capacity. A cooling tower rating includes compressor heat, so it is higher than the cooling capacity of the chiller it serves.
Related HVAC Tools & Resources
Frequently asked questions
How does the kcal/hr to TR Converter help HVAC teams verify a cooling capacity calculation?
To convert kilocalories per hour to tons of refrigeration, divide the hourly value by 3,024 under the common HVAC convention.
Keep the input in kcal/hr, not total kcal, because the unit describes a rate over time. Confirm the calorie basis used in the source document before recording the result.
Why is 3,000 kcal/hr only a rough shortcut for 1 TR when sizing or quoting HVAC equipment?
3,000 kcal/hr is a rough estimate, not the common HVAC conversion factor for 1 TR.
Using 3,024 kcal/hr, a 10 TR load equals about 30,240 kcal/hr, which is 240 kcal/hr above the shortcut. Use the specified basis for equipment selection and tender values.
Can a standard converter be used for cooling tower duty, and what else must be checked?
A cooling tower kcal/hr to TR calculation converts a stated heat rate, but it does not size a cooling tower by itself.
Selection also depends on heat rejection, water flow, entering and leaving water temperatures, and site design conditions. Check the manufacturer's rating conditions against the project specification.
How many kcal/hr equal one ton of AC, and which factor should an HVAC team record?
One refrigeration ton is about 3,024 kcal/hr under a common HVAC convention.
It is also defined as 12,000 BTU/hr, or about 3.517 kW. The kcal/hr equivalent varies slightly with the calorie definition, so match the basis stated in the equipment data or tender.
How do you convert kcal/hr to kW, and when is a TR calculator more useful?
The kcal/hr to kW conversion formula is kcal/hr × 0.001163 ≈ kW; for TR, divide by about 3,024.
A kcal to TR cooling calculator is useful when the result is needed in refrigeration tons. Confirm the source's calorie definition before using the value in a specification.
How should chiller catalog capacity be checked before comparing models?
For a chiller catalog kcal to TR conversion, first confirm that the listed figure is a rate in kcal/hr and note the rating conditions.
Convert only after checking whether the source lists kcal/hr, kW or TR, then compare models at equivalent operating conditions. A capacity value recorded at different test conditions may not be directly comparable.
How can old heat-load sheets and tender schedules keep unit conversions traceable?
A legacy heat load sheet unit converter can help reconcile older records.
Keep the original value, unit, calculation basis and converted result together. A tender document HVAC unit converter can help standardise submitted values, but retain the required unit and basis in the HVAC project schedule unit specifications.
How do TR, BTU/hr and kW compare when checking HVAC capacity?
One TR equals 12,000 BTU/hr, while 1 kW is approximately 3,412 BTU/hr.
A TR to BTU/hr calculation chart can speed a visual check, and kW to BTU/hr thermal capacity is found by multiplying kW by about 3,412. Keep rounding consistent across schedules and quotations.
Why do conversion references show slightly different kcal values for one TR?
Different references may use different definitions of a kilocalorie or BTU, which creates small differences in the calculated result.
An International Table kilocalorie vs US refrigeration ton comparison should state its unit conventions. When you need to convert kcal hr to ton of refrigeration, use the basis specified by the manufacturer or tender.
How many kW is 860 kcal/hr, and how should the result be recorded?
The 860 kcal/hr to kW conversion is approximately 1 kW using the rounded factor of 1 kcal/hr ≈ 1.163 W.
The calculation is 860 × 0.001163 ≈ 1 kW. For contract records, note the conversion factor and rounding used.