Answer: "it depends".

Converting angular to linear measurement is wholly dependent on where you're measuring it. While the angles will will stay the same regardless of where you measure it (as long as you're consistent on both sides), the lateral linear measurement at an given angle will increase as you move outwards from the center of the wheel.

For example, say your shop gave you toe out. Imagine looking at your wheels from above. If your linear measurement is at the wheel lip, then that distance will be less compared to the distance at the tire tread. Of course, even when measured at the tire tread, that distance (at the same angle) will be less on a 205/50-13 tire than it will be on a 245/55-17 tire. The lateral distance grows as you move outwards on the wheel/tire.

Since it's quite possible you will be adjusting the alignment of your car to suit your driving style and the track you're on, it's best if you get the tools and learn how to do your own alignments (even if that means two pieces of angle iron and a Stanley tape measure). Significantly more important than the actual numbers, consistency of baseline alignment is important to adjustments, fast times, and driver confidence.

GA