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

Formula

1 PS = 0.98632 hp

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

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 PS = 4.9316 hp
• 12.5 PS = 12.329 hp
• 100 PS = 98.632 hp

Metric horsepower (PS) to horsepower (mechanical) conversion table

FAQ

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

1 PS = 0.98632 hp. 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 metric horsepower (PS) to horsepower (mechanical)?

Multiply the value in metric horsepower (PS) by 0.9863200706: horsepower (mechanical) = metric horsepower (PS) × 0.9863200706. For example, 5 PS = 4.9316 hp.

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

Multiply by the inverse factor 1.013869665 (metric horsepower (PS) = horsepower (mechanical) × 1.013869665), or use the horsepower (mechanical)-to-metric horsepower (PS) page.

Related conversions

• Horsepower (mechanical) to metric horsepower (PS) (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_metric&to_unit=hp
• MCP: server https://tttkmbb.com/mcp, tool convert_units with {"value":5,"from_unit":"hp_metric","to_unit":"hp"}
• Markdown: https://tttkmbb.com/conversion/ps-to-hp.md · JSON: https://tttkmbb.com/conversion/ps-to-hp.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)