# Knots to Meters per second (kn to m/s)

> Convert knots to meters per second: 1 kn = 0.514444 m/s. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

- Page id: `knots-to-meters-per-second` · Quantity: Speed (`speed`, base unit m/s) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/knots-to-meters-per-second · This document: https://tttkmbb.com/conversion/knots-to-meters-per-second.md · JSON: https://tttkmbb.com/conversion/knots-to-meters-per-second.json (add `?value=` for a result)

## Formula

- `1 kn = 0.514444 m/s`
- `meters per second = knots × 0.5144444444`
- Reverse: `knots = meters per second × 1.943844492`

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 kn = 2.57222 m/s
- 12.5 kn = 6.43056 m/s
- 100 kn = 51.4444 m/s

## Conversion table

| Knots (kn) | Meters per second (m/s) |
| --- | --- |
| 1 | 0.514444 |
| 2 | 1.02889 |
| 3 | 1.54333 |
| 4 | 2.05778 |
| 5 | 2.57222 |
| 6 | 3.08667 |
| 7 | 3.60111 |
| 8 | 4.11556 |
| 9 | 4.63 |
| 10 | 5.14444 |
| 15 | 7.71667 |
| 20 | 10.2889 |
| 25 | 12.8611 |
| 30 | 15.4333 |
| 40 | 20.5778 |
| 50 | 25.7222 |
| 75 | 38.5833 |
| 100 | 51.4444 |
| 200 | 102.889 |
| 250 | 128.611 |
| 500 | 257.222 |
| 1000 | 514.444 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=kn&to_unit=m%2Fs` → 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":"kn","to_unit":"m/s"}`
- All speed units: https://tttkmbb.com/api/v1/units?quantity=speed · full converter: [Speed Converter](https://tttkmbb.com/conversion/speed.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## FAQ

**How many meters per second are in one knot?**

1 kn = 0.514444 m/s. 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 knots to meters per second?**

Multiply the value in knots by 0.5144444444: meters per second = knots × 0.5144444444. For example, 5 kn = 2.57222 m/s.

**How do I convert meters per second back to knots?**

Multiply by the inverse factor 1.943844492 (knots = meters per second × 1.943844492), or use the meters per second-to-knots page.

## Related conversions

- [Meters per second to knots](https://tttkmbb.com/conversion/meters-per-second-to-knots.md) (reverse)
- [Kilometers per hour to Miles per hour](https://tttkmbb.com/conversion/kmh-to-mph.md)
- [Miles per hour to Kilometers per hour](https://tttkmbb.com/conversion/mph-to-kmh.md)
- [Meters per second to Kilometers per hour](https://tttkmbb.com/conversion/meters-per-second-to-kmh.md)
- [Kilometers per hour to Meters per second](https://tttkmbb.com/conversion/kmh-to-meters-per-second.md)
- [Meters per second to Miles per hour](https://tttkmbb.com/conversion/meters-per-second-to-mph.md)
- [Miles per hour to Meters per second](https://tttkmbb.com/conversion/mph-to-meters-per-second.md)
- [Knots to Kilometers per hour](https://tttkmbb.com/conversion/knots-to-kmh.md)
- [Kilometers per hour to Knots](https://tttkmbb.com/conversion/kmh-to-knots.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)