Knots to Speed Of Light Conversion

Enter the speed in knots below to get the value converted to speed of light.

Results in Speed Of Light:
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1 kn = 1.716E-9 c
Hint: use a scientific notation calculator to convert E notation to decimal

How to Convert Knots to Speed Of Light

Speedometers are used in vehicles to measure speed

To convert a knot measurement to a speed of light measurement, multiply the speed by the conversion ratio. One knot is equal to 1.716E-9 speed of light, so use this simple formula to convert:

speed of light = knots × 1.716E-9

The speed in speed of light is equal to the knots multiplied by 1.716E-9.

For example, here's how to convert 500,000,000 knots to speed of light using the formula above.
500,000,000 kn = (500,000,000 × 1.716E-9) = 0.858001 c

Knots and speed of light are both units used to measure speed. Keep reading to learn more about each unit of measure.


One knot is equal to a speed of one nautical mile per hour,[1] or one minute of latitude per hour.

Knots can be abbreviated as kn, and are also sometimes abbreviated as kt. For example, 1 knot can be written as 1 kn or 1 kt.

Speed Of Light

The speed of light is equal to exactly 299,792,458 meters per second, or 670,616,629 miles per hour. The definition of the speed of light is actually derived from the most recent 1983 international definition of the meter.[2]

Speed of light can be abbreviated as c; for example, 1 speed of light can be written as 1 c.

Knot to Speed Of Light Conversion Table

Knot measurements converted to speed of light
Knots Speed Of Light
1 kn 0.000000001716 c
2 kn 0.000000003432 c
3 kn 0.000000005148 c
4 kn 0.000000006864 c
5 kn 0.00000000858 c
6 kn 0.000000010296 c
7 kn 0.000000012012 c
8 kn 0.000000013728 c
9 kn 0.000000015444 c
10 kn 0.00000001716 c
100 kn 0.0000001716 c
1,000 kn 0.000001716 c
10,000 kn 0.00001716 c
100,000 kn 0.000172 c
1,000,000 kn 0.001716 c
10,000,000 kn 0.01716 c
100,000,000 kn 0.1716 c
1,000,000,000 kn 1.716 c


  1. NASA, Knots Versus Miles per Hour,
  2. National Institute of Standards and Technology, SI Redefinition: Meter,