How do I convert fps to mph?
Type a value in either box, and the answer shows it in the other unit as you type.
- Miles per hour (mph)
- 0.681818
1 ft/s = 0.681818 mph.
Miles per hour (mph): 0.681818. 1 ft/s = 0.681818 mph.
Miles per hour (mph) by feet per second (ft/s)
How to calculate
Converts feet per second (ft/s) to miles per hour (mph) and back, with the exact unit definitions.
Example with the default inputs (Feet per second (ft/s) 1): 1 ft/s = 0.681818 mph.
Formula: mph = ft/s × 0.681818181818
- 1 foot per second = 0.681818181818 miles per hour, from the exact definitions in NIST SP 811.
- Exact on the typed decimals: at most 6 decimal places (6 significant digits below 0.0001), rounded half up; an answer of 1 billion or more shows at most 15 significant digits.
Worked examples
Each example is checked against the calculator on every build.
- Feet per second (ft/s) 1 gives Miles per hour (mph) 0.681818.Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8
- Feet per second (ft/s) 88 gives Miles per hour (mph) 60.Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8
- Miles per hour (mph) 60 gives Feet per second (ft/s) 88.Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8
Other questions people ask
How many miles per hour are in a foot per second?
1 foot per second is 0.681818 miles per hour, from the exact unit definitions (NIST SP 811).
How do I convert fps to mph?
Multiply by 0.681818: mph = ft/s × 0.681818181818. For example, 1 ft/s × 0.681818 = 0.681818 mph.
How do I convert mph back to fps?
Multiply by 1.466667, or type the miles per hour into the second box and the converter works it out. 1 mile per hour is 1.466667 feet per second.
Why multiply by 0.681818?
1 ft/s is 0.3048 m/s and 1 mph is 1,609.344 m ÷ 3,600 s = 0.44704 m/s (NIST SP 811). So 1 ft/s = 0.3048 ÷ 0.44704 = 15/22 mph exactly, 0.681818… mph.
What is 88 ft/s in mph?
60 mph exactly: 88 × 15/22. 44 ft/s is 30 mph.
Is fps frames per second here?
No. On this page fps means feet per second (ft/s), a speed. Frames per second count video frames and do not convert to mph.