Knot to Kilometer/Second Converter

Speed Converter

18 units available

Decimals:

From

To

0.000514

1 kn = 0.000514 km/s

Formula:

km/s = kn × 0.0005144444

With your value: 1 kn = 0.00051444 km/s

How big is that?

Everyday references on a logarithmic scale, all expressed in knot so you can sanity-check the result.

Your value1.00 kn

Walking pace (2.7× your value)2.72 kn

Cycling (11× your value)10.7 kn

Urban speed limit (50 km/h) (27× your value)27.0 kn

Cheetah sprint (56× your value)56.4 kn

Motorway (110 km/h) (59× your value)59.5 kn

Other Knot to Kilometer/Second conversions

2 kn to km/s 3 kn to km/s 4 kn to km/s 5 kn to km/s 6 kn to km/s 7 kn to km/s 8 kn to km/s

Knot to Kilometer/Second Conversion Table

Knot (kn)	Kilometer/Second (km/s)
0.5	0.000257
1	0.000514
2	0.001029
5	0.002572
10	0.005144
15	0.007717
20	0.010289
25	0.012861
50	0.025722
100	0.051444
250	0.128611
500	0.257222
1000	0.514444

Kilometer/Second to Knot Conversion Table

Kilometer/Second (km/s)	Knot (kn)
0.5	971.922247
1	1,943.844494
2	3,887.688988
5	9,719.222471
10	19,438.444941
15	29,157.667412
20	38,876.889882
25	48,596.112353
50	97,192.224706
100	194,384.449412
250	485,961.12353
500	971,922.24706
1000	1,943,844.49412

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Knot (kn)

Speed

Exact conversion

Derived quantity: a defined length divided by a defined time interval.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

Kilometer/Second (km/s)

Speed

Exact conversion

Derived quantity: a defined length divided by a defined time interval.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

How to Convert Knot to Kilometer/Second

To convert from Knot (kn) to Kilometer/Second (km/s), multiply the value by 0.0005144444.

Formula: km/s = kn × 0.0005144444

Reverse: kn = km/s × 1,943.84449412

Step-by-Step Example

Start with your value in Knot. For example: 5 kn
Multiply by the conversion factor: 5 x 0.0005144444
The result is: 0.002572 km/s

About Knot

The knot equals one nautical mile per hour and is used in maritime and aviation contexts.

Fun Fact: The knot gets its name from the practice of using a knotted rope to measure ship speed.

Common uses: navigation, aviation, sailing.

About Kilometer/Second

The kilometer/second (km/s) is a unit of speed and velocity. One kilometer/second equals 1000 metre per seconds. UnitConvertLab converts it against every other speed unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: speed calculations, engineering and science, education.

Frequently Asked Questions

How many Kilometer/Second are in 1 Knot?

There are exactly 0.0005144444 Kilometer/Second in 1 Knot. This means the conversion factor from Knot to Kilometer/Second is 0.0005144444.

What is the formula to convert Knot to Kilometer/Second?

The formula to convert Knot to Kilometer/Second is: km/s = kn × 0.0005144444. For example, to convert 10 Knot to Kilometer/Second, you would multiply 10 by 0.0005144444.

What is a Knot?