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Kilometers per Second to Feet per Second Converter

Convert kilometers per second (km/s) to feet per second (ft/s), with the formula, a conversion table and exact factors.

Change the values and press Calculate to work out your own figures.

Enter a speed, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.
The unit you want the answer in. Swap exchanges the two units.
Result
3,280.83989501 ft/s
knots
1,943.84449244 kn
Mach (at 343 m/s)
2.91545189504 Mach
speed of light
3.33564095198 × 10⁻⁶ c
miles per hour
2,236.93629205 mph
kilometers per hour
3,600 km/h
meters per second
1,000 m/s
centimeters per second
100,000 cm/s

1 km/s = 3,280.83989501 ft/s

Show the working
  1. 1 km/s = 3280.83989501 ft/s
  2. 1 × 3280.83989501 = 3280.83989501 ft/s

How to convert kilometers per second to feet per second

1 km/s = 3,280.83989501 ft/s, so multiply by 3,280.83989501 to go from kilometers per second to feet per second. Going the other way, 1 ft/s = 0.0003048 km/s.

ft/s = km/s × 3,280.83989501
km/s = ft/s × 0.0003048

Worked example:

1 km/s = 3280.83989501 ft/s
5 × 3280.83989501 = 16404.1994751 ft/s

Kilometers per Second to feet per second table

Kilometers per SecondFeet per Second
1 km/s3,280.83989501 ft/s
2 km/s6,561.67979003 ft/s
3 km/s9,842.51968504 ft/s
4 km/s13,123.3595801 ft/s
5 km/s16,404.1994751 ft/s
6 km/s19,685.0393701 ft/s
7 km/s22,965.8792651 ft/s
8 km/s26,246.7191601 ft/s
9 km/s29,527.5590551 ft/s
10 km/s32,808.3989501 ft/s
15 km/s49,212.5984252 ft/s
20 km/s65,616.7979003 ft/s
25 km/s82,020.9973753 ft/s
30 km/s98,425.1968504 ft/s
40 km/s131,233.595801 ft/s
50 km/s164,041.994751 ft/s
75 km/s246,062.992126 ft/s
100 km/s328,083.989501 ft/s
250 km/s820,209.973753 ft/s
500 km/s1,640,419.94751 ft/s
1000 km/s3,280,839.89501 ft/s

About the units

Kilometers per Second (km/s)
Kilometers per second, a metric unit. Definition: BIPM SI Brochure, 9th edition (SI units, prefixes and units accepted for use with the SI).
Feet per Second (ft/s)
Feet per second, a US customary unit. Definition: NIST Handbook 44 (2024), Appendix C: General Tables of Units of Measurement.

Formula version 0.1.0Reviewed