Here you go, I got this from this list quite a while ago: 
Measure your wheel/tire across the hub.  This gives the tire diameter (D).
pi*D = circumference in inches (C) = 360 degrees
.06 inches * 360 degrees / C = toe in degrees
You can get a decent approximation for D without measuring it by using the
tire height value posted by the manufacturer.
Readings in:    Inchs           Degrees         Millimeters
                1/32            .03             .79
                1/16            .06             1.6
                3/32            .09             2.4
                1/8             .13             3.2
                5/32            .16             4.0
                3/16            .19             4.8
                7/32            .22             5.6
                1/4             .25             6.4
Note these would be the same for toe-in as well as toe-out, only toe-out
would read as a negative figure.
> The printout for my last wheel alignment showed that toe
> was measured in inches, but the factory manual shows it in
> degrees.
> 
> How do I convert from one to the other?
> 
> Thanks,
> Pete
Jeff Cawthorne
San Diego
89 Corvette
94 Corvette
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