Average Speed

[DrummerMan48]

How do you calculate the average speed in MPH of a lap?

 

[Pupik]

Distance = Rate x Time.

Thus: (Rate) = (Distance in miles) divided by (time)

Solve for the unknown, or use a tachymeter and guesstimate.

 

[TenEightyOne]

You need to remember that you'll probably have a lap time in seconds, but you probably need the result in hours.

Here's an example of how to do it. The other night I took a Lotus V8 around Monaco GP (Cote d'Azur) in 1:48.026, that's 108.026 seconds [Reference]. Our DB records the track length for that track as 2.07 miles.

That's all the data you need to put in.

Here's the formula, TrackLength in miles, LapTime in seconds:

(3600 * (TrackLength / LapTime)) = AvSpeedMPH

Here's the example with the data in;

(3600 * (2.07 / 108.026)) = 68.983 mph

To summarise;

Divide the TrackLength (in miles) by the LapTime (in seconds). Multiply the result by 3600.

 

[IceMan PJN]

You need to remember that you'll probably have a lap time in seconds, but you probably need the result in hours.

Here's an example of how to do it. The other night I took a Lotus V8 around Monaco GP (Cote d'Azur) in 1:48.026, that's 108.026 seconds [Reference]. Our DB records the track length for that track as 2.07 miles.

That's all the data you need to put in.

Here's the formula, TrackLength in miles, LapTime in seconds:

(3600 * (TrackLength / LapTime)) = AvSpeedMPH

Here's the example with the data in;

(3600 * (2.07 / 108.026)) = 68.983 mph

To summarise;

Divide the TrackLength (in miles) by the LapTime (in seconds). Multiply the result by 3600.

Don't think I could have explained it better myself.