MPH to Feet Per Second Converter
Convert miles per hour to feet per second — multiply by about 1.467. Results update as you type; exact factors shown.
One mile per hour is 1.4667 feet per second — see the exact factor, not a rounded rule of thumb.
How the mph to feet per second 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 mph | 1.4667 ft/s | mile per hour to feet per second |
| 5 mph | 7.3333 ft/s | miles per hour to feet per second |
| 10 mph | 14.6667 ft/s | miles per hour to feet per second |
| 15 mph | 22 ft/s | miles per hour to feet per second |
| 20 mph | 29.3333 ft/s | miles per hour to feet per second |
| 25 mph | 36.6667 ft/s | miles per hour to feet per second |
| 30 mph | 44 ft/s | miles per hour to feet per second |
| 40 mph | 58.6667 ft/s | miles per hour to feet per second |
| 50 mph | 73.3333 ft/s | miles per hour to feet per second |
| 60 mph | 88 ft/s | miles per hour to feet per second |
| 70 mph | 102.6667 ft/s | miles per hour to feet per second |
| 100 mph | 146.6667 ft/s | miles per hour to feet per second |
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
How many feet per second is 60 mph?
88 ft/s exactly — a conversion worth memorising.
Why is 60 mph exactly 88 ft/s?
Because 60 miles is 316,800 feet and an hour is 3,600 seconds, and the division comes out whole.
Where is ft/s used?
Ballistics, sports measurement and US engineering, where reaction distances are in feet.
How far do I travel in a second at 30 mph?
44 feet — which is why stopping distances grow so fast with speed.
What is the conversion factor?
Multiply mph by 22/15, or about 1.4667.
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.