Horsepower to Metric Horsepower
Mechanical horsepower, about 745.7 watts, is the traditional unit for rating car and engine power in the US and UK. Metric horsepower (PS or CV), about 735.5 watts, is the traditional engine power rating used across continental Europe and Japan. 1 hp equals ≈1.01387 hp(M), so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to power, measured here against power's base unit (W) — every other power unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
hp(M) = hp × ≈1.01387
hp = hp(M) × ≈0.98632
Worked example: 5 hp × ≈1.01387 = ≈5.06935 hp(M).
Conversion table
| Horsepower (mech.) (hp) | Horsepower (metric) (hp(M)) |
|---|---|
| 1 hp | ≈1.01387 hp(M) |
| 2 hp | ≈2.02774 hp(M) |
| 3 hp | ≈3.04161 hp(M) |
| 5 hp | ≈5.06935 hp(M) |
| 10 hp | ≈10.1387 hp(M) |
| 20 hp | ≈20.2774 hp(M) |
| 25 hp | ≈25.3467 hp(M) |
| 50 hp | ≈50.6935 hp(M) |
| 100 hp | ≈101.387 hp(M) |
| 250 hp | ≈253.467 hp(M) |
| 500 hp | ≈506.935 hp(M) |
| 1,000 hp | ≈1,013.87 hp(M) |
Frequently asked
- How many Horsepower (metric) in a horsepower (mech.)?
- 1 hp equals ≈1.01387 hp(M).
- How do I convert Horsepower to Horsepower (metric)?
- Multiply the value in hp by ≈1.01387 to get hp(M). The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Horsepower (mech.) and Horsepower (metric) are both defined by a fixed conversion factor to power's base unit (W), so the result shown is exact to the precision displayed, not an approximation.