Millimeter/Second to Inch/Second Converter

Speed Converter

18 units available

Decimals:

From

To

0.03937

1 mm/s = 0.03937 in/s

Formula:

in/s = mm/s × 0.0393700787

With your value: 1 mm/s = 0.03937008 in/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 Inch/Second conversions

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

Millimeter/Second to Inch/Second Conversion Table

Millimeter/Second (mm/s)	Inch/Second (in/s)
0.5	0.019685
1	0.03937
2	0.07874
5	0.19685
10	0.393701
15	0.590551
20	0.787402
25	0.984252
50	1.968504
100	3.937008
250	9.84252
500	19.685039
1000	39.370079

Inch/Second to Millimeter/Second Conversion Table

Inch/Second (in/s)	Millimeter/Second (mm/s)
0.5	12.7
1	25.4
2	50.8
5	127
10	254
15	381
20	508
25	635
50	1,270
100	2,540
250	6,350
500	12,700
1000	25,400

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

Inch/Second (in/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 Inch/Second

To convert from Millimeter/Second (mm/s) to Inch/Second (in/s), multiply the value by 0.0393700787.

Formula: in/s = mm/s × 0.0393700787

Reverse: mm/s = in/s × 25.4

Step-by-Step Example

Start with your value in Millimeter/Second. For example: 5 mm/s
Multiply by the conversion factor: 5 x 0.0393700787
The result is: 0.19685 in/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 Inch/Second

The inch/second (in/s) is a unit of speed and velocity. One inch/second equals 0.0254 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 Inch/Second are in 1 Millimeter/Second?

There are exactly 0.0393700787 Inch/Second in 1 Millimeter/Second. This means the conversion factor from Millimeter/Second to Inch/Second is 0.0393700787.

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

The formula to convert Millimeter/Second to Inch/Second is: in/s = mm/s × 0.0393700787. For example, to convert 10 Millimeter/Second to Inch/Second, you would multiply 10 by 0.0393700787.

What is a Millimeter/Second?