---
title: "Knots to Times the speed of light — kn to c converter"
description: "1 knot = 1.716 × 10^-9 times the speed of light. Conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/knots-to-speed-of-light/
site: "At One Place"
---

# Knots to times the speed of light

**1 knot in times the speed of light: 1 kn = 1.716 × 10^-9 c**

c = kn × 1.716001956 × 10^-9

To convert knots to times the speed of light, multiply by 1.716001956 × 10^-9. The table below gives the values people look up most often, and the converter works for any number.

## Knots to times the speed of light table

*Common knot values converted to times the speed of light.*

| Knots | Times the speed of light |
| --- | --- |
| 1 kn | 1.716 × 10^-9 |
| 2 kn | 3.432 × 10^-9 |
| 3 kn | 5.148 × 10^-9 |
| 4 kn | 6.864 × 10^-9 |
| 5 kn | 8.58 × 10^-9 |
| 10 kn | 1.716 × 10^-8 |
| 15 kn | 2.574 × 10^-8 |
| 20 kn | 3.432 × 10^-8 |
| 25 kn | 4.29 × 10^-8 |
| 30 kn | 5.148 × 10^-8 |
| 40 kn | 6.864 × 10^-8 |
| 50 kn | 8.58 × 10^-8 |
| 75 kn | 1.287 × 10^-7 |
| 100 kn | 1.716 × 10^-7 |
| 250 kn | 4.29 × 10^-7 |
| 500 kn | 8.58 × 10^-7 |
| 1,000 kn | 0.000001716 |

## How the conversion works

The relationship is c = kn × 1.716001956 × 10^-9. Both units measure speed, so the conversion is a fixed factor that never changes.

> Speed of light: Exact by definition.

## Common questions

### How many times the speed of light are in one knot?

One knot equals 1.716 × 10^-9 times the speed of light. c = kn × 1.716001956 × 10^-9.

### How do you convert knots to times the speed of light?

Use c = kn × 1.716001956 × 10^-9. So 10 kn is 1.716 × 10^-8 c.

### How many knots are in one speed of light?

One speed of light equals 582,749,920 knots, which is the reverse of the conversion above.

### Is there more than one kind of speed of light?

Exact by definition.

## Related pages

- [Times the speed of light to Knots](https://atoneplace.net/convert/speed-of-light-to-knots/)
- [Knots to Meters per second](https://atoneplace.net/convert/knots-to-meters-per-second/)
- [Knots to Kilometers per hour](https://atoneplace.net/convert/knots-to-kmh/)
- [Knots to Miles per hour](https://atoneplace.net/convert/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/)