Foot/Second to Kilometer/Hour (ft/s to km/h)
Result
1.09728 Kilometer/Hour
Formula
km/h = ft/s × 1.09728
1 ft/s = 1.09728 km/h, and 1 km/h = 0.9113444153 ft/s.
Speed units are a length divided by a time: 1 km/h = 1/3.6 m/s, 1 mph = 0.44704 m/s exactly, and 1 knot = 1 nautical mile per hour = 1,852/3,600 m/s.
Worked examples
- 1 ft/s × 1.09728 = 1.09728 km/h
- 10 ft/s × 1.09728 = 10.9728 km/h
- 100 ft/s × 1.09728 = 109.728 km/h
Common mistakes
- A knot is a nautical mile per hour, so 1 kn = 1.852 km/h and 1.15078 mph — not 1 mph.
- Weather services quote wind in km/h, m/s, mph or knots depending on country; check the unit before comparing forecasts.
Foot/Second to Kilometer/Hour table
| Foot/Second (ft/s) | Kilometer/Hour (km/h) |
|---|---|
| 1 | 1.09728 |
| 2 | 2.19456 |
| 5 | 5.4864 |
| 10 | 10.9728 |
| 20 | 21.9456 |
| 50 | 54.864 |
| 100 | 109.728 |
| 1,000 | 1,097.28 |
The units
- Foot/Second (ft/s)
- 1 Foot/Second = 0.3048 Meter/Second.
- Kilometer/Hour (km/h)
- Kilometres per hour: 1 km/h = 1/3.6 m/s ≈ 0.27778 m/s.
Sources for these factors
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
- Handbook 44 (2024), Appendix C: General Tables of Units of Measurement — NIST
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy