Same input, every length unit — tap a tile to set the right-hand unit.
Automotive parts bounce between millimeter drawings and inch catalogs. European wheel offsets list ET in mm; US tire diameter talk often starts in inches; bore and stroke on a rebuild sheet may mix both. This length converter is aimed at those shop cross-checks — not kitchen tablespoons.
Enter the number on the print, pick the unit, and read the full board (mm, cm, m, in, ft). Cookie memory keeps your last pair so the next job starts where you left off. Treat the result as measurement math — verify critical clearances with a calibrated tool before you machine or install.