Speed, Distance, Time Calculator

Convert between speed, distance and time for road traffic accident reconstruction

How to use this calculator
Enter any two of speed, distance and time, and the calculator will compute the third. Supports multiple units (mph, km/h, metres, miles, etc.).

Use the formula: Speed = Distance ÷ Time. Enter any two values and calculate the third with full unit conversion support.

Calculate Distance

Unit Conversion Constants

1 mile

1609.344 metres

1 km

1000 metres

1 metre

3.28084 feet

1 hour

3600 seconds

1 m/s in mph

2.236936 mph

1 m/s in km/h

3.6 km/h

1 mph in m/s

0.44704 m/s

1 km/h in m/s

0.27778 m/s