Convert kilometers per hour to feet per second and see equivalent meters per second, miles per hour, feet per minute, and yards per second.
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km/h to ft/s Formula
- ft/s = speed in feet per second
- km/h = speed in kilometers per hour
- 0.911344 = rounded conversion factor (3280.8398 ft per km ÷ 3600 s per hour)
The exact factor is 1000 ÷ (3600 × 0.3048) = 3125/3429, approximately 0.9113444153. The decimal factors shown are rounded. To go the other direction, multiply ft/s by the exact factor 1.09728.
Reference Values
Common km/h speeds converted to ft/s and other common units.
| km/h | ft/s | m/s | mph |
|---|---|---|---|
| 1 | 0.911 | 0.278 | 0.621 |
| 5 | 4.557 | 1.389 | 3.107 |
| 10 | 9.113 | 2.778 | 6.214 |
| 30 | 27.340 | 8.333 | 18.641 |
| 50 | 45.567 | 13.889 | 31.069 |
| 80 | 72.908 | 22.222 | 49.710 |
| 100 | 91.134 | 27.778 | 62.137 |
| 120 | 109.361 | 33.333 | 74.565 |
| 200 | 182.269 | 55.556 | 124.274 |
Quick rule of thumb: ft/s is roughly 9/10 of the km/h value.
| Conversion | Multiply by |
|---|---|
| km/h → ft/s | 0.911344 |
| ft/s → km/h | 1.09728 |
| km/h → m/s | 0.277778 |
| km/h → mph | 0.621371 |
Example
Convert 72 km/h to ft/s:
ft/s ≈ 72 × 0.911344 ≈ 65.617 ft/s
Check: 72 km/h is 20 m/s. Multiply 20 by 3.28084 ft/m and you get the same 65.617 ft/s.
Why is the factor 0.911344?
One kilometer equals 3280.839895 feet. One hour equals 3600 seconds. Dividing 3280.839895 by 3600 gives 0.911344, the number of feet covered each second when moving 1 km/h.
How do I reverse the conversion?
Multiply ft/s by the exact factor 1.09728 to get km/h; division by the rounded 0.911344 factor gives an approximation.
