Speed / km/h → ft/s
Convert Kilometers per hour to Feet per second
Convert linear speeds in metric, customary, and nautical units. Convert Kilometers per hour (km/h) to Feet per second (ft/s). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Feet per second to Kilometers per hour →
How to convert kilometers per hour to feet per second
A knot is one international nautical mile (1852 meters) per hour. Mach is excluded because the speed of sound depends on the medium and conditions.
Use x for the value in km/h, b for the intermediate value in m/s, and y for the result in ft/s.
ft/s = km/h × 0.2777777777777778 ÷ 0.3048
Worked examples
10 km/h ≈ 9.11344415281 ft/s
Step 1: (10 × 0.277777777778) ≈ 2.77777777778 m/s.
Step 2: 2.77777777778 ÷ 0.3048 ≈ 9.11344415281 ft/s.20 km/h ≈ 18.2268883056 ft/s
Step 1: (20 × 0.277777777778) ≈ 5.55555555556 m/s.
Step 2: 5.55555555556 ÷ 0.3048 ≈ 18.2268883056 ft/s.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Kilometers per hour
Kilometers per hour (km/h) measures speed under the conventions above. The base value in m/s is (x × 0.277777777778), where x is the numerical value in km/h. Factors shown here are rounded for display; calculations use the stored factor.
About Feet per second
Feet per second (ft/s) measures speed under the conventions above. The base value in m/s is (x × 0.3048), where x is the numerical value in ft/s. Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Kilometers per hour to feet per second reference table
| Kilometers per hour (km/h) | Feet per second (ft/s) |
|---|---|
| 1 | 0.911344415281 |
| 5 | 4.55672207641 |
| 10 | 9.11344415281 |
| 25 | 22.783610382 |
| 50 | 45.5672207641 |
| 100 | 91.1344415281 |
| 1000 | 911.344415281 |
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