Home › Unit Conversion › Feet per second to Miles per hour
Feet per second to Miles per hour (ft/s to mph)
Convert feet per second to miles per hour: 1 ft/s = 0.681818 mph. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 ft/s = 0.681818 mph
miles per hour = feet per second × 0.6818181818 — reverse: feet per second = miles per hour × 1.466666667
The factor is derived from the SI definitions of both units (base unit: m/s) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.
Worked examples
- 5 ft/s = 3.40909 mph
- 12.5 ft/s = 8.52273 mph
- 100 ft/s = 68.1818 mph
Feet per second to miles per hour conversion table
| Feet per second (ft/s) | Miles per hour (mph) |
|---|---|
| 1 | 0.681818 |
| 2 | 1.36364 |
| 3 | 2.04545 |
| 4 | 2.72727 |
| 5 | 3.40909 |
| 6 | 4.09091 |
| 7 | 4.77273 |
| 8 | 5.45455 |
| 9 | 6.13636 |
| 10 | 6.81818 |
| 15 | 10.2273 |
| 20 | 13.6364 |
| 25 | 17.0455 |
| 30 | 20.4545 |
| 40 | 27.2727 |
| 50 | 34.0909 |
| 75 | 51.1364 |
| 100 | 68.1818 |
| 200 | 136.364 |
| 250 | 170.455 |
| 500 | 340.909 |
| 1000 | 681.818 |
FAQ
How many miles per hour are in one foot per second?
1 ft/s = 0.681818 mph. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.
What is the formula to convert feet per second to miles per hour?
Multiply the value in feet per second by 0.6818181818: miles per hour = feet per second × 0.6818181818. For example, 5 ft/s = 3.40909 mph.
How do I convert miles per hour back to feet per second?
Multiply by the inverse factor 1.466666667 (feet per second = miles per hour × 1.466666667), or use the miles per hour-to-feet per second page.
Related conversions
- Miles per hour to feet per second (reverse)
- Speed Converter — all speed units in one tool
- Kilometers per hour to Miles per hour
- Miles per hour to Kilometers per hour
- Meters per second to Kilometers per hour
- Kilometers per hour to Meters per second
- Meters per second to Miles per hour
- Miles per hour to Meters per second
- Knots to Kilometers per hour
- Kilometers per hour to Knots
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=ft%2Fs&to_unit=mph - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"ft/s","to_unit":"mph"} - Markdown: https://tttkmbb.com/conversion/feet-per-second-to-mph.md · JSON: https://tttkmbb.com/conversion/feet-per-second-to-mph.json (add
?value=for a result) · Units: /api/v1/units?quantity=speed - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.