A Lap is 400m and a mile is 1609.3m so basically 4 laps is a mile.
If it's a 400 meter track (which is one standard size) then four laps around the track is approximately a mile.
If you are saying that the track is .125 of a mile, then it would be a 200 meter track. In that case, eight laps around the track would be a mile.
8 laps = 1 mile
3 miles = 4 828.032 metres 1 lap = 400 metres 3 miles = 12 laps and 28 metres
On official size tracks, the answer is 4 laps make a mile when your jogging 4 laps make a mile