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AC Tonnage Calculator.

Convert a stated cooling load from BTU per hour to refrigeration tons.

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Results update as you type.

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Results use only the stated formula and entered units; they are not building-code, equipment-sizing, or structural design advice.

Use Cases

Sizing Air Conditioners

When you have a heat load calculation in BTU/h, use this tool to express it in tons, which is a common unit for AC capacity.

Example: A room with a heat load of 36,000 BTU/h equals 3 tons.

Comparing Equipment Ratings

Convert manufacturer specs from BTU/h to tons to compare different AC units on the same scale.

Example: An AC rated at 18,000 BTU/h is 1.5 tons.

Frequently Asked Questions

How do I use the AC Tonnage Calculator?
Simply enter your heat load in BTU per hour (BTU/h) into the 'Heat load' field. The calculator will convert it to refrigeration tons, where 1 ton equals 12,000 BTU/h.
What is a refrigeration ton?
A refrigeration ton is a unit of cooling capacity. One ton equals the amount of heat required to melt one ton of ice in 24 hours, which is 12,000 BTU per hour.
Why is my result in tons and not kW?
This calculator specifically converts BTU/h to refrigeration tons. If you need kilowatts, you would need a different conversion tool.

Tips & Common Mistakes

Tips

  • Ensure your heat load is in BTU per hour (BTU/h) before entering it.
  • Remember that 1 ton equals 12,000 BTU/h, so you can also divide by 12,000 manually.
  • This calculator is for converting a known heat load; it does not calculate the heat load itself.
  • For residential sizing, typical capacities range from 1 to 5 tons.

Common Mistakes to Avoid

  • Entering heat load in BTU per minute or per day instead of per hour.
  • Confusing refrigeration tons with weight tons; they are different units.
  • Using the result as a final AC size without considering other factors like insulation or climate.

Last updated: August 13, 2026