This speed calculation tool allows you to determine your average speed and your pace per kilometre in one click, by entering the distance of the race and the actual or estimated time. As a reminder, a marathon measures 26.2 miles (42.195km) and a half-marathon measures 13.1 miles (21.097km) 😉

You can then calculate split times over the distance of your choice or the time per 400m lap if you are doing a track session for example.

Good preparation for your next challenge (with the RunMotion Coach app 😉)

Contents

## Calculate your average speed and pace

## Average speed: Formula

If you want to calculate the speed manually, the formula is

speed = distance / time

To calculate speed in kilometers per hour, divide the distance in kilometers by the time in hours. For miles per hour, divide the distance in miles by the time in hours. To determine speed in meters per second, divide the distance in meters by the time in seconds.

If you want to convert a speed of m/s into km/h, just multiply the speed in m/s by 3.6 because 1 hour = 3600 seconds and 1 kilometre = 1000 meters.

### Km/h example

** i. e:** To calculate 10km in 40min,

Distance = 10000m

Time = 40×60 = 2400 seconds

Speed = 10000/2400 x 3.6

Speed = 15 km/h

### Miles/h example

To calculate 13.1miles (Half Marathon) in 2 hours,

Distance = 13.1 miles

Time = 120×60 = 7200 seconds

Speed = 13100/7200 x 3.6

Speed = 6.65 miles / hour

Also if you want to convert miles to km, 1 mile = 1,609km. Hence 10 miles/hour is roughly 16 km/h.