Kilometer/Second to Foot/Second Converter

Speed Converter

18 units available

Decimals:

From

To

3,280.839895

1 km/s = 3,280.839895 ft/s

Formula:

ft/s = km/s × 3,280.8398950131

With your value: 1 km/s = 3,280.83989501 ft/s

How big is that?

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

Urban speed limit (50 km/h) (1/72 your value)0.0139 km/s

Cheetah sprint (1/34 your value)0.0290 km/s

Motorway (110 km/h) (1/33 your value)0.0306 km/s

Airliner cruise (1/4.0 your value)0.250 km/s

Speed of sound (sea level) (1/2.9 your value)0.343 km/s

Your value1.00 km/s

Other Kilometer/Second to Foot/Second conversions

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

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

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

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.

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

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

How to Convert Kilometer/Second to Foot/Second

To convert from Kilometer/Second (km/s) to Foot/Second (ft/s), multiply the value by 3,280.8398950131.

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

Reverse: km/s = ft/s × 0.0003048

Step-by-Step Example

Start with your value in Kilometer/Second. For example: 5 km/s
Multiply by the conversion factor: 5 x 3,280.8398950131
The result is: 16,404.199475 ft/s

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.

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.

Frequently Asked Questions

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

There are exactly 3,280.8398950131 Foot/Second in 1 Kilometer/Second. This means the conversion factor from Kilometer/Second to Foot/Second is 3,280.8398950131.

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

The formula to convert Kilometer/Second to Foot/Second is: ft/s = km/s × 3,280.8398950131. For example, to convert 10 Kilometer/Second to Foot/Second, you would multiply 10 by 3,280.8398950131.

What is a Kilometer/Second?