Speed Converter
Convert between mph, km/h, m/s, ft/s, knots, and Mach. Real-time results with travel calculator.
All Units at a Glance
| Unit | Value |
|---|---|
| Miles per hour (mph) | — |
| Kilometers per hour (km/h) | — |
| Meters per second (m/s) | — |
| Feet per second (ft/s) | — |
| Knots (nmi/h) | — |
| Mach (at sea level) | — |
Travel Calculator
Common Speed Reference
| Description | mph | km/h | m/s |
|---|---|---|---|
| Average walking pace | 3 | 4.8 | 1.3 |
| Jogging / easy run | 6 | 9.7 | 2.7 |
| Competitive sprint (100m world record) | 27.8 | 44.7 | 12.4 |
| City speed limit (typical) | 25–35 | 40–56 | 11–16 |
| Highway / motorway speed | 60–75 | 97–121 | 27–34 |
| High-speed train (TGV, Shinkansen) | 200 | 322 | 89 |
| Speed of sound (sea level, 20°C) | 767 | 1235 | 343 |
| Mach 2 (fighter jet) | 1535 | 2470 | 686 |
| Low Earth orbit | 17,500 | 28,160 | 7,822 |
| Speed of light | 670,616,629 | 1,079,252,848 | 299,792,458 |
How to use
- Enter a speed value in either field and select the units — the result updates instantly
- Use the ⇄ button to swap the from and to units
- The "All Units at a Glance" table shows your entered speed in every unit simultaneously
- Distance → Time: Enter a distance and speed to calculate travel time
- Time → Distance: Enter a duration and speed to calculate distance covered
- Mach speed uses 343 m/s (speed of sound at sea level, approximately 20°C)