To convert feet per second to mach, multiply by 0.0008957066032.
The calculation uses 1 ft/s = 0.0008957066032 Mach. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
Assumes a sound speed of 340.29 m/s, approximately dry air at 15 °C. Actual Mach conversion depends on the medium and temperature.
The formula
ft/s- Input unit: feet per second
Mach- Output unit: mach
How to use this calculator
- Enter a value in ft/s.
- Multiply by the stored conversion factor.
- Read the result in Mach; divide by the same factor to convert back.
Worked examples
Worked conversion
1 ft/s × 0.0008957066032 ≈ 0.0008957066032 Mach.
Reverse conversion
0.0008957066032 Mach ÷ 0.0008957066032 ≈ 1 ft/s. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 0.0008957066032 Mach per ft/s. Assumes a sound speed of 340.29 m/s, approximately dry air at 15 °C. Actual Mach conversion depends on the medium and temperature.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
ft/s to Mach table
| ft/s | Mach (rounded) |
|---|---|
| 0 | 0 |
| 1 | 0.0008957066032 |
| 2 | 0.001791413206 |
| 5 | 0.004478533016 |
| 10 | 0.008957066032 |
| 100 | 0.08957066032 |