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 metres 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 UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
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 metre per seconds |
|---|---|---|
| metre per second | m/s | 1 metre per second |
| kilometre per hour | km/h | 0.2777777778 metre per second |
| mile per hour | mph | 0.44704 metre per second |
| knot | kn | 0.5144444444 metre per second |
| foot per second | ft/s | 0.3048 metre per second |
| Mach (sea level, 15 °C) | Ma | 340.29 metre 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 Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.