How to use the Speed Calculator
The speed calculator finds speed, distance or time from the other two.
What you need to enter
- Solve for
- Distance (km)
- Time (hours)
- Speed (km/h)
The formula
Speed = distance ÷ time.
Worked example
Using the default values in the calculator:
- Solve for: Speed
- Distance (km): 120
- Time (hours): 1.5
- Speed (km/h): 80
| Speed | 80 km/h |
| Miles per hour | 49.7097 |
| Metres per second | 22.2222 |
Tips for better results
- Convert units first.
- Use average speed for trips.
Common mistakes to avoid
- Mixing minutes and hours.
- Using it for changing speeds.
Please note: Results are estimates for general use. For safety-critical work such as electrical or building projects, check with a qualified professional and local codes. See our Disclaimer.