Train Speed Calculator

Average Speed Is the Number Behind Every Timetable

The scheduled speed printed on a timetable is rarely the top speed a train ever reaches — it's an average across the whole run, including acceleration out of stations and deceleration into them. Dividing distance covered by time taken strips out all of that detail and gives the one number that actually determines whether a service arrives on time.

The Formula

The result is given in km/h, with the equivalent in meters per second alongside it, since m/s is the unit used in most physics-based calculations like braking distance.

Where This Is Useful

• Benchmarking service performance — compare the average speed a service actually achieves against the speed the timetable assumes.
• Comparing routes or modes — a straightforward apples-to-apples figure for comparing a rail route against a road or air alternative.
• Feeding other calculations — average speed in m/s is a direct input into braking distance and signal spacing calculations.

Worked Example

How to Use This Calculator

1. Enter the Distance travelled, in kilometers.
2. Enter the Travel Time, in hours.
3. Select Calculate to get the average speed in both km/h and m/s.

Related Calculations

For a calculator that can solve for distance or time instead of speed, use the Schedule Timing Calculator. Once speed is known, check the Braking Distance Calculator to see the stopping distance it implies.