Foot/Second to Kilometer/Second Converter

Speed Converter

18 units available

Decimals:

From

To

0.000305

1 ft/s = 0.000305 km/s

Formula:

km/s = ft/s × 0.0003048

With your value: 1 ft/s = 0.0003048 km/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 Kilometer/Second conversions

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

Foot/Second to Kilometer/Second Conversion Table

Foot/Second (ft/s)	Kilometer/Second (km/s)
0.5	0.000152
1	0.000305
2	0.00061
5	0.001524
10	0.003048
15	0.004572
20	0.006096
25	0.00762
50	0.01524
100	0.03048
250	0.0762
500	0.1524
1000	0.3048

Kilometer/Second to Foot/Second Conversion Table

Kilometer/Second (km/s)	Foot/Second (ft/s)
0.5	1,640.419948
1	3,280.839895
2	6,561.67979
5	16,404.199475
10	32,808.39895
15	49,212.598425
20	65,616.7979
25	82,020.997375
50	164,041.994751
100	328,083.989501
250	820,209.973753
500	1,640,419.947507
1000	3,280,839.895013

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

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 Foot/Second to Kilometer/Second

To convert from Foot/Second (ft/s) to Kilometer/Second (km/s), multiply the value by 0.0003048.

Formula: km/s = ft/s × 0.0003048

Reverse: ft/s = km/s × 3,280.8398950131

Step-by-Step Example

Start with your value in Foot/Second. For example: 5 ft/s
Multiply by the conversion factor: 5 x 0.0003048
The result is: 0.001524 km/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 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 Foot/Second?

There are exactly 0.0003048 Kilometer/Second in 1 Foot/Second. This means the conversion factor from Foot/Second to Kilometer/Second is 0.0003048.

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

The formula to convert Foot/Second to Kilometer/Second is: km/s = ft/s × 0.0003048. For example, to convert 10 Foot/Second to Kilometer/Second, you would multiply 10 by 0.0003048.

What is a Foot/Second?