Convert

Mechanical horsepower to Metric horsepower

Exact answer: 1 hp = 1.013869665424 PS (exact defined factor)

Mechanical horsepower and Metric horsepower describe the same quantity from the Power family but come from different systems of units. The factor is defined exactly. Power figures appear in vehicle documents, engine data, heating load calculations and appliance ratings.

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Convert units with formula, context and precision

UnitCloud is a local measurement lab for everyday work, engineering, IT, energy, mobility and design. Every conversion shows result, formula, base unit, rounding and the common mistake.

What do you want to convert?

From1 hp

Result1.01387 PS

Factor1 hp = 1.013869665424 PS

Source basisBIPM SI Brochure · NIST Guide to SI Appendix B

Examples

011 hp = 1.01387 PS

Example value from the reference table. Internal calculation uses stored factors; display output is rounded.

02Common mistake

PS and hp are not identical. Vehicle data often uses metric horsepower, while US/UK contexts often use mechanical horsepower.

03Base unit: W

1 hp = 745.699871582 W. Then the value is converted through the base unit W into Metric horsepower.

Table

Mechanical horsepower to Metric horsepower
Mechanical horsepower	Metric horsepower
1	1.01387
10	10.138697
50	50.693483
100	101.386967
200	202.773933
500	506.934833

Formula

1 hp = 745.699871582 W. Then the value is converted through the base unit W into Metric horsepower.

Sources

BIPM SI BrochureSI base units, prefixes and official SI context.NIST Guide to SI Appendix BNIST conversion-factor method and non-SI factors.

Related conversions

Kilowatt to Metric horsepowerkW → PSPower Metric horsepower to KilowattPS → kWPower Kilowatt to Mechanical horsepowerkW → hpPower Metric horsepower to Mechanical horsepowerPS → hpPower

Search and practice paths

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Factor origin

Factors come from the stored source family and are not derived from rounded display values.

Rounding rule

UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.

When not to use

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.

Citation

Citation note: UnitCloud, conversion with formula, sources reviewed: September 2026. Power. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.

Common questions

What is the factor for Mechanical horsepower to Metric horsepower?

1 hp = 1.013869665424 PS

Which formula does Mechanical horsepower to Metric horsepower use?

1 hp = 745.69987158227 W. Then the value is converted through the base unit W into Metric horsepower.

What is the most common mistake?

PS and hp are not identical. Vehicle data often uses metric horsepower, while US/UK contexts often use mechanical horsepower.

When should I verify the result?

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.