From
To
Learn more about
Feet per second to kilometers per hour: exact catalog factor, conversion chart, and engineering tips
Conversion formula
Verification: factors follow standard unit definitions; round for display only.
Quick reference chart
| Foot per second | Kilometer per hour |
|---|---|
| 1 | 1.09728 |
| 2 | 2.19456 |
| 3 | 3.29184 |
| 4 | 4.38912 |
| 5 | 5.4864 |
| 6 | 6.58368 |
Educational explanation
Feet per second to kilometers per hour
Convert ft/s to km/h when US ballistics, HVAC, or piping manuals quote feet per second but metric road limits, European specs, or public weather graphics use kilometers per hour.
Feet per second (ft/s) and kilometers per hour (km/h) share the same time base but use US customary feet versus metric kilometers in the numerator. Catalog anchors:
km/h = ft/s × 1.0972799999 · (0.3048 ÷ 0.2777777778 m/s per unit)
Because 1 ft = 0.3048 m and 1 km/h = 1/3.6 m/s, the factor is exact—about 1.09728 km/h per ft/s at catalog precision.
Step-by-step conversion (worked example — 50 ft/s)
- km/h = 50 × 1.0972799999122176
- = 54.864 km/h
Second worked example (13.33 ft/s from 800 ft/min duct)
800 ft/min ÷ 60 = 13.333 ft/s:
- 13.333 × 1.0972799999122176 = 14.63 km/h
Quick mental estimate
Multiply ft/s by 1.1 for km/h (~0.2% high). Example: 30 ft/s → 33 km/h (exact: 32.92 km/h).
Feet per second to km/h conversion chart
| Feet per second (ft/s) | Kilometers per hour (km/h) | Typical context |
|---|---|---|
| 5 ft/s | 5.49 km/h | Light duct airflow |
| 13.33 ft/s | 14.63 km/h | ≈ 800 ft/min face velocity |
| 27.78 ft/s | 30.48 km/h | ≈ 100 km/h road anchor |
| 50 ft/s | 54.86 km/h | Ballistics / sports band |
| 100 ft/s | 109.73 km/h | Low rifle muzzle velocity order |
Where ft/s → km/h comes up
- Cross-border engineering: US manuals in ft/s versus EU commissioning sheets in km/h.
- Sports telemetry: Radar in ft/s with European broadcast km/h overlays.
- Metric road comparison: Translating projectile or wind-tunnel ft/s into familiar highway km/h anchors.
Kilometers per hour to feet per second
Convert km/h to ft/s when a speed limit or GPS lists kilometers per hour but US duct schedules or ballistics tables expect feet per second.
Divide km/h by 1.0972799999 or multiply by 0.9113444154.
ft/s = km/h × 0.9113444154 · ft/s = km/h ÷ 1.0972799999
Step-by-step conversion (worked example — 100 km/h)
- 100 ÷ 1.0972799999122176 = 91.134 ft/s
- ≈ 27.78 ft/s—metric highway cap in ft/s form
Quick reference (km/h → ft/s)
| Kilometers per hour (km/h) | Feet per second (ft/s) | Typical context |
|---|---|---|
| 50 km/h | 45.567 ft/s | Urban limit |
| 100 km/h | 91.134 ft/s | National highway |
| 120 km/h | 109.361 ft/s | Motorway |
Ft/s vs km/h, common mistakes, and related tools
Convert ft/min to ft/s before applying factors. ft/s is not the same numeric value as km/h.
Related speed converters
ft/s to mph, ft/s to m/s, km/h to m/s, and km/h to mph.
Frequently asked questions
What is the formula to convert ft/s to km/h?
km/h = ft/s × 1.0972799999. Example: 50 ft/s → 54.86 km/h.
What is the formula to convert km/h to ft/s?
ft/s = km/h ÷ 1.0972799999. Example: 100 km/h → 91.134 ft/s.
How many km/h are in 1 ft/s?
About 1.097280 km/h per ft/s at catalog precision.
What is 100 ft/s in km/h?
109.73 km/h.
What is 100 km/h in ft/s?
91.134 ft/s.
Is ft/s to km/h exact?
Yes via 0.3048 m per foot and km/h = m/s × 3.6 through catalog anchors.
How does this relate to m/s?
ft/s × 0.3048 = m/s; m/s × 3.6 = km/h. Combine or use this page's direct factor.
What is 30 ft/s in km/h?
32.92 km/h.
Can I multiply ft/s by 1.1 exactly?
1.1 is a mental shortcut; use 1.09728 (catalog) for round-trip accuracy.
Do I need ft/min conversion?
Yes—divide ft/min by 60 to get ft/s before converting to km/h.
How do ft/s km/h compare to mph?
Use ft/s to mph for statute miles; this page is metric km/h only.
Popular conversions