Horsepower (mechanical) to Metric horsepower (PS) (hp to PS)

Formula

1 hp = 1.01387 PS

metric horsepower (PS) = horsepower (mechanical) × 1.013869665 — reverse: horsepower (mechanical) = metric horsepower (PS) × 0.9863200706

The factor is derived from the SI definitions of both units (base unit: W) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.

Worked examples

• 5 hp = 5.06935 PS
• 12.5 hp = 12.6734 PS
• 100 hp = 101.387 PS

Horsepower (mechanical) to metric horsepower (PS) conversion table

FAQ

How many metric horsepower (PS) are in one horsepower?

1 hp = 1.01387 PS. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

What is the formula to convert horsepower (mechanical) to metric horsepower (PS)?

Multiply the value in horsepower (mechanical) by 1.013869665: metric horsepower (PS) = horsepower (mechanical) × 1.013869665. For example, 5 hp = 5.06935 PS.

How do I convert metric horsepower (PS) back to horsepower (mechanical)?

Multiply by the inverse factor 0.9863200706 (horsepower (mechanical) = metric horsepower (PS) × 0.9863200706), or use the metric horsepower (PS)-to-horsepower (mechanical) page.

Related conversions

• Metric horsepower (PS) to horsepower (mechanical) (reverse)
• Power Converter — all power units in one tool
• Horsepower (mechanical) to Kilowatts
• Kilowatts to Horsepower (mechanical)
• Kilowatts to Watts
• Watts to Kilowatts
• BTU per hour to Watts
• Watts to BTU per hour
• Metric horsepower (PS) to Kilowatts
• Kilowatts to Metric horsepower (PS)

Machine access

• API: GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=hp&to_unit=hp_metric
• MCP: server https://tttkmbb.com/mcp, tool convert_units with {"value":5,"from_unit":"hp","to_unit":"hp_metric"}
• Markdown: https://tttkmbb.com/conversion/hp-to-ps.md · JSON: https://tttkmbb.com/conversion/hp-to-ps.json (add ?value= for a result) · Units: /api/v1/units?quantity=power
• OpenAPI operationId: convert_units. Freshness: static. Authentication: none.

Sources

• NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors (standard)
• BIPM – The International System of Units (SI Brochure, 9th edition) (standard)
• Wikipedia – Conversion of units (reference)