Millimeter/Second to Kilometer/Second Converter

Speed Converter

18 units available

Decimals:

From

To

1.000000e-6

1 mm/s = 1.000000e-6 km/s

Formula:

km/s = mm/s × 0.000001

With your value: 1 mm/s = 1.000000e-6 km/s

How big is that?

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

Your value1.00 mm/s

Walking pace (1.4e+3× your value)1.40e+3 mm/s

Cycling (5.5e+3× your value)5.50e+3 mm/s

Urban speed limit (50 km/h) (1.4e+4× your value)1.39e+4 mm/s

Cheetah sprint (2.9e+4× your value)2.90e+4 mm/s

Motorway (110 km/h) (3.1e+4× your value)3.06e+4 mm/s

Other Millimeter/Second to Kilometer/Second conversions

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

Millimeter/Second to Kilometer/Second Conversion Table

Millimeter/Second (mm/s)	Kilometer/Second (km/s)
0.5	5.000000e-7
1	1.000000e-6
2	2.000000e-6
5	5.000000e-6
10	1.000000e-5
15	1.500000e-5
20	2.000000e-5
25	2.500000e-5
50	5.000000e-5
100	0.0001
250	0.00025
500	0.0005
1000	0.001

Kilometer/Second to Millimeter/Second Conversion Table

Kilometer/Second (km/s)	Millimeter/Second (mm/s)
0.5	500,000
1	1,000,000
2	2,000,000
5	5,000,000
10	10,000,000
15	15,000,000
20	20,000,000
25	25,000,000
50	50,000,000
100	100,000,000
250	250,000,000
500	500,000,000
1000	1,000,000,000

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.

Millimeter/Second (mm/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

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 Millimeter/Second to Kilometer/Second

To convert from Millimeter/Second (mm/s) to Kilometer/Second (km/s), multiply the value by 1.000000e-6.

Formula: km/s = mm/s × 0.000001

Reverse: mm/s = km/s × 1,000,000

Step-by-Step Example

Start with your value in Millimeter/Second. For example: 5 mm/s
Multiply by the conversion factor: 5 x 1.000000e-6
The result is: 5.000000e-6 km/s

About Millimeter/Second

The millimeter/second (mm/s) is a unit of speed and velocity. One millimeter/second equals 0.001 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.

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 Millimeter/Second?

There are exactly 1.000000e-6 Kilometer/Second in 1 Millimeter/Second. This means the conversion factor from Millimeter/Second to Kilometer/Second is 1.000000e-6.

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

The formula to convert Millimeter/Second to Kilometer/Second is: km/s = mm/s × 0.000001. For example, to convert 10 Millimeter/Second to Kilometer/Second, you would multiply 10 by 1.000000e-6.

What is a Millimeter/Second?