Feet per Second to MPH
Convert any value from foot/second to mile/hour with full precision. Use the converter above for instant results, or read on for the exact formula, worked examples, common uses, and answers to frequently asked questions.
📊 Quick Conversion Table
About the Foot/Second to Mile/Hour conversion
Speed conversions are needed for travel, sports, physics, and engineering. The metric system uses meters per second and kilometers per hour, while the US and UK commonly use miles per hour. Nautical contexts use knots. Aviation uses Mach number and feet per minute in some instruments.
This page focuses specifically on converting foot/second to mile/hour. Use the converter above for instant results, or read on for the exact formula, a worked example, and answers to common questions.
Where this conversion is used
Drivers compare speed limits and vehicle performance in mph and kph. Pilots use knots for airspeed. Sailors track boat speed in knots. Scientists use meters per second and the speed of light. Athletes measure running, cycling, and swimming speeds, often in km/h or mph.
If you frequently convert foot/second to mile/hour, bookmark this page — the exact URL gives you instant access without searching, and the conversion widget is ready to use the moment the page loads.
Conversion formula
The exact mathematical relationship between foot/second and mile/hour is:
1 foot/second = 0.68181818 mile/hour
So to convert a value V from foot/second to mile/hour, use:
Vmile/hour = Vfoot/second × 0.68181818
To go in the opposite direction:
Vfoot/second = Vmile/hour × 1.46666667
These factors come from the international definitions published by NIST, BIPM, and ISO 80000 and are exact within their respective standard systems. The converter applies them with full floating-point precision.
Worked example
Using the formula above, here are some common values converted from Foot/Second to Mile/Hour:
| Foot/Second | Mile/Hour |
|---|---|
| 1 | 0.681818 |
| 5 | 3.409091 |
| 10 | 6.818182 |
| 25 | 17.045455 |
| 50 | 34.090909 |
| 100 | 68.181818 |
Sources and accuracy
Speed conversions are linear because they are ratios of length to time. Factors follow from the SI definition of the meter and second by BIPM. One knot equals exactly one nautical mile per hour (1.852 km/h), defined by the International Hydrographic Organization.
This page was reviewed against multiple authoritative references. Conversion factors are cross-checked with the NIST SP 811 guide, the BIPM SI brochure, ISO 80000, and where applicable, the historical references for older unit systems. If you spot an inconsistency or have a suggested improvement, please let us know via the contact page.
Important disclaimer: for mission-critical work — medical dosing, legal-for-trade measurements, aerospace, large-scale engineering, and financial calculations — always verify independently with the original source. This converter is intended for everyday conversions, education, and quick reference.
Practical tips
A handy mental conversion: 100 kph is about 62 mph, and 60 mph is about 97 kph. For wind speeds, the Beaufort scale provides descriptive equivalents that are useful in everyday conversation.
If you are converting large lists of values, use the swap button to instantly reverse direction without retyping. For decimal-heavy values you can paste them directly into the From field — the input accepts standard decimal notation, including negative values and scientific notation (for example, 1.23e-5).
Frequently asked questions
How accurate is this foot/second to mile/hour converter?
It uses the official international conversion factors from NIST and BIPM with full double-precision floating-point accuracy. For everyday use the result is precise to many more decimal places than any practical measurement requires.
Can I convert in both directions?
Yes. Use the ⇄ button above to swap the From and To fields. You can also change either dropdown to any unit in the speed category.
Do I need an internet connection?
Only for the first page load. Once the converter is loaded it runs entirely in your browser, so it works offline as well.
Is my data private?
Yes. The conversion calculation happens locally in your browser. The values you enter are never sent to any server.