---
title: "21 kn to mph = 24.16637 mph"
description: "21 knots is 24.16637 miles per hour. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/21-knots-to-mph/
site: "At One Place"
---

# 21 kn to mph

**21 knots in miles per hour: 21 kn = 24.16637 mph**

mph = kn × 1.150779448

21 knots is 24.16637 miles per hour. To get there, multiply by 1.150779448.

## Values either side

*Knots near 21, converted to miles per hour.*

| Knots | Miles per hour |
| --- | --- |
| 17 kn | 19.56325 |
| 18 kn | 20.71403 |
| 19 kn | 21.86481 |
| 20 kn | 23.01559 |
| 21 kn ← | 24.16637 |
| 22 kn | 25.31715 |
| 23 kn | 26.46793 |
| 24 kn | 27.61871 |
| 25 kn | 28.76949 |

## How the conversion works

The relationship is mph = kn × 1.150779448. Both units measure speed, so the conversion is a fixed factor that never changes.

## Common questions

### What is 21 kn in miles per hour?

21 kn is 24.16637 mph.

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

Multiply by 1.150779448.

## Related pages

- [Knots to miles per hour](https://atoneplace.net/convert/knots-to-mph/)
- [21 mph to kn](https://atoneplace.net/convert/21-mph-to-knots/)
- [17 kn to mph](https://atoneplace.net/convert/17-knots-to-mph/)
- [18 kn to mph](https://atoneplace.net/convert/18-knots-to-mph/)
- [19 kn to mph](https://atoneplace.net/convert/19-knots-to-mph/)
- [20 kn to mph](https://atoneplace.net/convert/20-knots-to-mph/)
- [22 kn to mph](https://atoneplace.net/convert/22-knots-to-mph/)
- [23 kn to mph](https://atoneplace.net/convert/23-knots-to-mph/)
- [24 kn to mph](https://atoneplace.net/convert/24-knots-to-mph/)
- [25 kn to mph](https://atoneplace.net/convert/25-knots-to-mph/)

## 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/)