Foot/Second to Mile/Hour (ft/s to mph)
Result
0.6818181818 Mile/Hour
Formula
mph = ft/s × 0.6818181818
1 ft/s = 0.6818181818 mph, and 1 mph = 1.466666667 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 × 0.6818181818 = 0.68181818 mph
- 10 ft/s × 0.6818181818 = 6.8181818 mph
- 100 ft/s × 0.6818181818 = 68.181818 mph
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 Mile/Hour table
| Foot/Second (ft/s) | Mile/Hour (mph) |
|---|---|
| 1 | 0.68181818 |
| 2 | 1.3636364 |
| 5 | 3.4090909 |
| 10 | 6.8181818 |
| 20 | 13.636364 |
| 50 | 34.090909 |
| 100 | 68.181818 |
| 1,000 | 681.81818 |
The units
- Foot/Second (ft/s)
- 1 Foot/Second = 0.3048 Meter/Second.
- Mile/Hour (mph)
- Miles per hour: exactly 0.44704 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