Step 2 · Measure
Measure Mode, built for a tape measure, not a CAD course.
For each wall, enter the length and ceiling height in feet and inches. Tap what's on the wall (door, window, electrical panel, water heater, steps, outlets, garage door track) and enter where it is.
Type 16' 6" or 198, both work
The electrical panel's 30" clear working space is drawn for you
Add as many walls as the garage has