Feet Per Second to MPH Converter
Convert feet per second to miles per hour — divide by about 1.467. Results update as you type; exact factors shown.
One foot per second is 0.6818 miles per hour — see the exact factor, not a rounded rule of thumb.
How the feet per second to mph converter works
Speeds convert through meters per second. 1 km/h is 1000/3600 m/s; 1 mph is 1609.344/3600 m/s; a knot is one nautical mile (1,852 m) per hour. Mach is shown against the standard sea-level speed of sound of 340.29 m/s and varies with altitude and temperature.
The US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common speed conversions
| From | To | Units |
|---|---|---|
| 1 ft/s | 0.6818 mph | foot per second to miles per hour |
| 5 ft/s | 3.4091 mph | feet per second to miles per hour |
| 10 ft/s | 6.8182 mph | feet per second to miles per hour |
| 22 ft/s | 15 mph | feet per second to miles per hour |
| 44 ft/s | 30 mph | feet per second to miles per hour |
| 50 ft/s | 34.0909 mph | feet per second to miles per hour |
| 88 ft/s | 60 mph | feet per second to miles per hour |
| 100 ft/s | 68.1818 mph | feet per second to miles per hour |
| 147 ft/s | 100.2273 mph | feet per second to miles per hour |
| 200 ft/s | 136.3636 mph | feet per second to miles per hour |
| 500 ft/s | 340.9091 mph | feet per second to miles per hour |
| 1,116 ft/s | 760.9091 mph | feet per second to miles per hour |
Units in this converter and their exact factors
| Unit | Symbol | One unit in meter per seconds |
|---|---|---|
| meter per second | m/s | 1 meter per second |
| kilometer per hour | km/h | 0.2777777778 meter per second |
| mile per hour | mph | 0.44704 meter per second |
| knot | kn | 0.5144444444 meter per second |
| foot per second | ft/s | 0.3048 meter per second |
| Mach (sea level, 15 °C) | Ma | 340.29 meter per second |
FAQFrequently asked questions about speed conversion
What is 88 ft/s in mph?
Exactly 60 mph.
How do I convert quickly?
Multiply by 15/22, or about 0.682.
What is the speed of sound in ft/s?
About 1,116 ft/s at 20 °C, which is 761 mph.
Why do ballistics use ft/s?
Because muzzle velocities are large and the numbers stay readable — 3,000 ft/s rather than 2,045 mph.
What is a fast pitch in mph?
A 100 mph fastball is 147 ft/s.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.