Here's a Chart For A Popular Tire Diameter

Toe-Out Data For A Tire With A Diameter of 18 Inches

Toe-Out Distance                 Toe-Out Angle      
Fraction     Decimal         Minutes     Degrees      
1/32     0.03125       5.96831     0.099472
1/16     0.06250     11.93664     0.198944
3/32     0.09375     17.90501     0.298417
  1/8     0.12500     23.87343     0.397891
5/32     0.15625     29.84193     0.497365
3/16     0.18750     35.81051     0.596842
7/32     0.21875     41.77920     0.696320
  1/4     0.25000     47.74802     0.795800