---
title: "21 km/h to kn = 11.33909 kn"
description: "21 kilometers per hour is 11.33909 knots. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/21-kmh-to-knots/
site: "At One Place"
---

# 21 km/h to kn

**21 kilometers per hour in knots: 21 km/h = 11.33909 kn**

kn = km/h × 0.5399568035

21 kilometers per hour is 11.33909 knots. To get there, multiply by 0.5399568035.

## Values either side

*Kilometers per hour near 21, converted to knots.*

| Kilometers per hour | Knots |
| --- | --- |
| 17 km/h | 9.179266 |
| 18 km/h | 9.719222 |
| 19 km/h | 10.25918 |
| 20 km/h | 10.79914 |
| 21 km/h ← | 11.33909 |
| 22 km/h | 11.87905 |
| 23 km/h | 12.41901 |
| 24 km/h | 12.95896 |
| 25 km/h | 13.49892 |

## How the conversion works

The relationship is kn = km/h × 0.5399568035. Both units measure speed, so the conversion is a fixed factor that never changes.

## Common questions

### What is 21 km/h in knots?

21 km/h is 11.33909 kn.

### How do you convert kilometers per hour to knots?

Multiply by 0.5399568035.

## Related pages

- [Kilometers per hour to knots](https://atoneplace.net/convert/kmh-to-knots/)
- [21 kn to km/h](https://atoneplace.net/convert/21-knots-to-kmh/)
- [17 km/h to kn](https://atoneplace.net/convert/17-kmh-to-knots/)
- [18 km/h to kn](https://atoneplace.net/convert/18-kmh-to-knots/)
- [19 km/h to kn](https://atoneplace.net/convert/19-kmh-to-knots/)
- [20 km/h to kn](https://atoneplace.net/convert/20-kmh-to-knots/)
- [22 km/h to kn](https://atoneplace.net/convert/22-kmh-to-knots/)
- [23 km/h to kn](https://atoneplace.net/convert/23-kmh-to-knots/)
- [24 km/h to kn](https://atoneplace.net/convert/24-kmh-to-knots/)
- [25 km/h to kn](https://atoneplace.net/convert/25-kmh-to-knots/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)