1/8th mile computed into 1/4mile

Here is something i found that might give us a better idea on the this subject i have look around an i find it to be sum what accurate on my time slips

1/8 = 1/4

4.6 = 7.08
4.7 = 7.24
4.8 = 7.39
4.9 = 7.55
5.0 = 7.70
5.1 = 7.85
5.2 = 8.00
5.3 = 8.16
5.4 = 8.32
5.5 = 8.47
5.6 = 8.62
5.7 = 8.78
5.8 = 8.93
5.9 = 9.09
6.0 = 9.24
6.1 = 9.39
6.2 = 9.55
6.3 = 9.70
6.4 = 9.86
6.5 = 10.01
6.6 = 10.16
6.7 = 10.32
6.8 = 10.47
6.9 = 10.63
7.0 = 10.78
7.1 = 10.93
7.2 = 11.09
7.3 = 11.24
7.4 = 11.40
7.5 = 11.55
7.6 = 11.70
7.8 = 12.01
7.9 = 12.17
8.0 = 12.32
8.1 = 12.47
8.2 = 12.63
8.3 = 12.78
8.4 = 12.94
8.5 = 13.09
8.6 = 13.24
8.7 = 13.40
8.8 = 13.55
8.9 = 13.71
9.0 = 13.86
9.1 = 14.01
9.2 = 14.17
9.3 = 14.32
9.4 = 14.48
9.5 = 14.63
9.6 = 14.78
9.7 = 14.84
9.8 = 15.09