Speed Calculator
Calculate speed based on distance and time.
What would you like to calculate?
Unit System
Understanding Speed Calculations
Speed Formula
Speed is calculated using the formula:
Speed = Distance ÷ Time
This can be rearranged to find distance or time:
Distance = Speed × Time
Time = Distance ÷ Speed
Unit Conversions
| From | To | Multiply By |
|---|---|---|
| km/h | mph | 0.621371 |
| km/h | m/s | 0.277778 |
| mph | km/h | 1.60934 |
| mph | m/s | 0.44704 |
| m/s | km/h | 3.6 |
| m/s | mph | 2.23694 |
Common Speeds for Reference
Walking
5 km/h
Running
12 km/h
Cycling
20 km/h
Car (City)
50 km/h
Car (Highway)
100 km/h
Airplane
900 km/h
Sound
1,235 km/h
Light
1.08 billion km/h
Tips for Using the Calculator
- Choose what to calculate: Speed, distance, or time based on your needs
- Select unit system: Metric (km, km/h) or Imperial (miles, mph)
- Enter known values: Fill in the fields for which you already have data
- Time format: Enter hours and minutes separately for more precise calculations
- Decimal precision: Results are rounded to 2 decimal places for readability
- Unit conversions: The calculator automatically provides conversions between common speed units