Foot/Second to Millimeter/Second Converter

Speed Converter

18 units available

Decimals:

From

To

304.8

1 ft/s = 304.8 mm/s

Formula:

mm/s = ft/s × 304.8

With your value: 1 ft/s = 304.8 mm/s

How big is that?

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

Your value1.00 ft/s

Walking pace (4.6× your value)4.59 ft/s

Cycling (18× your value)18.0 ft/s

Urban speed limit (50 km/h) (46× your value)45.6 ft/s

Cheetah sprint (95× your value)95.1 ft/s

Motorway (110 km/h) (1.0e+2× your value)100 ft/s

Other Foot/Second to Millimeter/Second conversions

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

Foot/Second to Millimeter/Second Conversion Table

Foot/Second (ft/s)	Millimeter/Second (mm/s)
0.5	152.4
1	304.8
2	609.6
5	1,524
10	3,048
15	4,572
20	6,096
25	7,620
50	15,240
100	30,480
250	76,200
500	152,400
1000	304,800

Millimeter/Second to Foot/Second Conversion Table

Millimeter/Second (mm/s)	Foot/Second (ft/s)
0.5	0.00164
1	0.003281
2	0.006562
5	0.016404
10	0.032808
15	0.049213
20	0.065617
25	0.082021
50	0.164042
100	0.328084
250	0.82021
500	1.64042
1000	3.28084

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.

Foot/Second (ft/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

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

How to Convert Foot/Second to Millimeter/Second

To convert from Foot/Second (ft/s) to Millimeter/Second (mm/s), multiply the value by 304.8.

Formula: mm/s = ft/s × 304.8

Reverse: ft/s = mm/s × 0.0032808399

Step-by-Step Example

Start with your value in Foot/Second. For example: 5 ft/s
Multiply by the conversion factor: 5 x 304.8
The result is: 1,524 mm/s

About Foot/Second

The foot/second (ft/s) is a unit of speed and velocity. One foot/second equals 0.3048 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 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.

Frequently Asked Questions

How many Millimeter/Second are in 1 Foot/Second?

There are exactly 304.8 Millimeter/Second in 1 Foot/Second. This means the conversion factor from Foot/Second to Millimeter/Second is 304.8.

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

The formula to convert Foot/Second to Millimeter/Second is: mm/s = ft/s × 304.8. For example, to convert 10 Foot/Second to Millimeter/Second, you would multiply 10 by 304.8.

What is a Foot/Second?