12000 BTU to Tons
Updated
Convert 12,000 BTU/hr to tons of refrigeration with a worked formula, nearby-size chart, and HVAC FAQs.
Direct answer: 12,000 BTU/hr = 1 ton.
Quick converter
Tons of refrigeration
12,000 BTU/hr = 3,516.85 W of thermal capacity. Updates as you type.
The standard refrigeration ton is a capacity unit equal to 12,000 BTU/hr. That makes 12,000 BTU/hr exactly 1 ton of cooling. Contractors use tons when selecting air conditioners, chillers, and heat pumps, while manufacturers may print BTU/hr on the nameplate. Both describe the same thermal capacity.
The calculation is direct: tons = BTU/hr / 12,000. For this example, 12,000 / 12,000 = 1.00 ton. A 24,000 BTU/hr system is 2 tons, a 36,000 BTU/hr system is 3 tons, and a 9,000 BTU/hr system is 0.75 ton. Actual installed sizing still requires a load calculation because climate, insulation, windows, occupancy, and ducts change required capacity. A ton does not state electrical demand; consult EER, SEER, COP, or the rated input.
Worked example
- 1. Start
12,000 BTU/hr
- 2. Apply the formula
12,000 / 12,000
- 3. Round the result
12,000 BTU/hr = 1 ton
Practical guidance
Where the ton comes from
The unit dates from ice-based cooling. One short ton of ice absorbs about 288,000 BTU while melting (2,000 lb x 144 BTU/lb), and spread over 24 hours that is 12,000 BTU/hr. The ice is long gone from modern equipment, but the number stayed as the standard measure of air-conditioner and chiller capacity.
Common sizes in tons
9,000 BTU/hr is 0.75 ton, 18,000 is 1.5 tons, 24,000 is 2 tons, 30,000 is 2.5 tons, 36,000 is 3 tons, 48,000 is 4 tons and 60,000 is 5 tons. Residential equipment is sold in these half-ton steps, so a calculated load of 1.3 tons normally means choosing between a 1.5-ton unit and a variable-capacity model.
Tons to kW for metric datasheets
One refrigeration ton is 3.517 thermal kW, so a 2-ton system is 7.034 kW and a 3-ton system is 10.551 kW. Metric and European datasheets quote that thermal kW, not the compressor's electrical input.
Capacity versus electrical load
A one-ton unit does not draw one ton of anything electrical. At an EER of 11, a 12,000 BTU/hr unit draws about 1,091 W (12,000 / 11). Higher-efficiency equipment delivers the same ton for fewer watts, which is why two one-ton units can have very different running costs.
Why bigger is not better
An oversized unit reaches the thermostat setting quickly and shuts off before it has removed much moisture, leaving the room cool but clammy and cycling more often. A rough range of 450 to 550 square feet for a one-ton unit under standard conditions is only a starting point; a proper load calculation decides the final size.
Common mistakes to avoid
- Reading a ton as a weight instead of a cooling capacity
- Rounding a 0.75-ton or 1.3-ton load up without checking the actual heat load
- Assuming a larger ton rating always cools better; oversizing causes short-cycling and poor dehumidification
12000 BTU to Tons chart
| BTU/hr | kW | Tons | HP |
|---|---|---|---|
| 9,000 | 2.638 | 0.75 | 3.537 |
| 12,000 | 3.517 | 1 | 4.716 |
| 18,000 | 5.275 | 1.5 | 7.074 |
| 24,000 | 7.034 | 2 | 9.432 |
| 30,000 | 8.792 | 2.5 | 11.79 |
| 36,000 | 10.551 | 3 | 14.149 |
| 48,000 | 14.067 | 4 | 18.865 |
| 60,000 | 17.584 | 5 | 23.581 |
Common questions
Why is a ton used for air conditioners?
It is a historical cooling-capacity unit, not a mass measurement. One refrigeration ton equals 12,000 BTU/hr.
Is 12,000 BTU/hr always one ton?
Yes for the standard refrigeration definition; performance and input are separate questions.
What is 24,000 BTU/hr in tons?
24,000 / 12,000 = 2 tons.
Does one ton tell me power use?
No. It tells capacity. Check EER, SEER, COP, or the rated input.
Can this replace a load calculation?
No. Use this chart for reference and have the building load calculated before selecting equipment.
How many kW is one ton of cooling?
One refrigeration ton is 3.517 thermal kW (3,516.85 W). A 2.5 ton system is therefore 8.792 kW.
How many BTU/hr is 2.5 tons?
Multiply tons by 12,000: 2.5 x 12,000 = 30,000 BTU/hr.
What is 18,000 BTU/hr in tons?
18,000 / 12,000 = 1.5 tons, a common mid-size split-system capacity.
More size guides
Continue with the BTU to kW converter, compare BTU/hr to tons of refrigeration, or check the BTU to horsepower converter.