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

> Convert metric horsepower (PS) to horsepower (mechanical): 1 PS = 0.98632 hp. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

- Page id: `ps-to-hp` · Quantity: Power (`power`, base unit W) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/ps-to-hp · This document: https://tttkmbb.com/conversion/ps-to-hp.md · JSON: https://tttkmbb.com/conversion/ps-to-hp.json (add `?value=` for a result)

## Formula

- `1 PS = 0.98632 hp`
- `horsepower (mechanical) = metric horsepower (PS) × 0.9863200706`
- Reverse: `metric horsepower (PS) = horsepower (mechanical) × 1.013869665`

The factor follows from the SI definitions of both units (NIST SP 811); values below are rounded 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

## Conversion table

| Metric horsepower (PS) (PS) | Horsepower (mechanical) (hp) |
| --- | --- |
| 1 | 0.98632 |
| 2 | 1.97264 |
| 3 | 2.95896 |
| 4 | 3.94528 |
| 5 | 4.9316 |
| 6 | 5.91792 |
| 7 | 6.90424 |
| 8 | 7.89056 |
| 9 | 8.87688 |
| 10 | 9.8632 |
| 15 | 14.7948 |
| 20 | 19.7264 |
| 25 | 24.658 |
| 30 | 29.5896 |
| 40 | 39.4528 |
| 50 | 49.316 |
| 75 | 73.974 |
| 100 | 98.632 |
| 200 | 197.264 |
| 250 | 246.58 |
| 500 | 493.16 |
| 1000 | 986.32 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=hp_metric&to_unit=hp` → unified JSON envelope with `result.values.result`, `formula`, `factor`, `sources`, `freshness`
- MCP: server `https://tttkmbb.com/mcp`, tool `convert_units` with `{"value":5,"from_unit":"hp_metric","to_unit":"hp"}`
- All power units: https://tttkmbb.com/api/v1/units?quantity=power · full converter: [Power Converter](https://tttkmbb.com/conversion/power.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## 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)](https://tttkmbb.com/conversion/hp-to-ps.md) (reverse)
- [Horsepower (mechanical) to Kilowatts](https://tttkmbb.com/conversion/hp-to-kw.md)
- [Kilowatts to Horsepower (mechanical)](https://tttkmbb.com/conversion/kw-to-hp.md)
- [Kilowatts to Watts](https://tttkmbb.com/conversion/kw-to-watts.md)
- [Watts to Kilowatts](https://tttkmbb.com/conversion/watts-to-kw.md)
- [BTU per hour to Watts](https://tttkmbb.com/conversion/btu-per-hour-to-watts.md)
- [Watts to BTU per hour](https://tttkmbb.com/conversion/watts-to-btu-per-hour.md)
- [Metric horsepower (PS) to Kilowatts](https://tttkmbb.com/conversion/ps-to-kw.md)
- [Kilowatts to Metric horsepower (PS)](https://tttkmbb.com/conversion/kw-to-ps.md)

## Data Sources

- NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors — https://www.nist.gov/pml/special-publication-811 (standard, retrieved 2026-09-24)
- BIPM – The International System of Units (SI Brochure, 9th edition) — https://www.bipm.org/en/publications/si-brochure (standard, retrieved 2026-09-24)
- Wikipedia – Conversion of units — https://en.wikipedia.org/wiki/Conversion_of_units (reference, retrieved 2026-09-24)