Convert Metric horsepower to Tons of refrigeration
1 metric horsepower is 0.21 TR. One metric horsepower is exactly 0.209135492166 tons of refrigeration.
One metric horsepower is 0.20913549 tons of refrigeration. To convert metric horsepower to tons of refrigeration, multiply by 0.20913549; to go the other way, divide by 0.20913549 or multiply by 4.7815891. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Special Publication 811. Exactly 75 kilogram-force meters a second, which is 1.4% less than mechanical horsepower.
Factor checked against the defining standard · How we check
- Metric horsepower × 0.20913549
1 * 0.20913550.209 TR
1 metric horsepower in every power unit
| Unit | Value | Exact factor |
|---|---|---|
| horsepower | 0.9863200706 hp | × 0.98632007062 |
| metric horsepower (as entered) | 1 PS | — |
| watts | 735.49875 W | × 735.49875 |
| kilowatts | 0.73549875 kW | × 0.73549875 |
| milliwatts | 735,498.75 mW | × 735,498.75 |
| megawatts | 0.00073549875 MW | × 0.00073549875 |
| tons of refrigeration | 0.2091354922 TR | × 0.209135492166 |
| BTU per hour | 2,509.625906 BTU/h | × 2,509.62590599 |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert metric horsepower to tons of refrigeration? The converter and the working
- 1.Take the measurement in metric horsepower.
- 2.Multiply by 0.20913549 — that is how many tons of refrigeration fit in one metric horsepower.
- 3.To go back the other way, divide by 0.20913549, or multiply by 4.7815891.
Worked example: 25 metric horsepower to tons of refrigeration
- Formula
- PS × 0.20913549 = TR
- Arithmetic
- 25 × 0.20913549 = 5.23 TR
- Answer
- 25 PS = 5.23 TR
The factor is rounded for display; the figure above is computed from the full value.
Metric horsepower to tons of refrigeration conversion table
| Metric horsepower | Tons of refrigeration |
|---|---|
| 1 PS | 0.21 TR |
| 2 PS | 0.42 TR |
| 3 PS | 0.63 TR |
| 4 PS | 0.84 TR |
| 5 PS | 1.05 TR |
| 6 PS | 1.25 TR |
| 7 PS | 1.46 TR |
| 8 PS | 1.67 TR |
| 9 PS | 1.88 TR |
| 10 PS | 2.09 TR |
| 12 PS | 2.51 TR |
| 15 PS | 3.14 TR |
| 20 PS | 4.18 TR |
| 25 PS | 5.23 TR |
| 50 PS | 10.46 TR |
| 100 PS | 20.91 TR |
| 200 PS | 41.83 TR |
| 300 PS | 62.74 TR |
| 500 PS | 104.57 TR |
| 1000 PS | 209.14 TR |
| 2000 PS | 418.27 TR |
| 5000 PS | 1,045.68 TR |
| 10000 PS | 2,091.35 TR |
What is a metric horsepower?
Exactly 75 kilogram-force meters a second, which is 1.4% less than mechanical horsepower. A German car quoted at 150 PS is 148 hp, and the difference is the definition rather than the engine.
What is a ton of refrigeration?
Exactly 12,000 BTU an hour — the rate at which a short ton of ice melts over a day, which is what air conditioning was measured against before it was made electrically. A three-ton domestic unit is 36,000 BTU/h, or 10.5 kW.
How many tons of refrigeration are in a metric horsepower?
One metric horsepower is 0.20913549 tons of refrigeration. Going the other way, one ton of refrigeration is 4.7815891 metric horsepower. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every power unit here
The whole group — 8 units with their symbols and the size of each one in watts — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a metric horsepower.
Source: NIST Special Publication 811 — mechanical horsepower is 550 ft·lbf/s exactly
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- APA
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- Rule Calculator. "Convert Metric horsepower to tons of refrigeration." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/metric-horsepower-to-ton-of-refrigeration.
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Questions people actually ask
- How many tons of refrigeration are in a metric horsepower?
- 0.20913549. Exactly 12,000 BTU an hour — the rate at which a short ton of ice melts over a day, which is what air conditioning was measured against before it was made electrically. A three-ton domestic unit is 36,000 BTU/h, or 10.5 kW.
- How do I convert tons of refrigeration back to metric horsepower?
- Divide by 0.20913549, or multiply by 4.7815891 — they are the same operation.
Other power conversions
Tons of refrigeration to metric horsepower — the same conversion the other way.