Use the same unit of measurement for all entries — the calculator outputs results in degrees regardless of unit.
The two orange STRING bars represent the measurement strings running alongside the car. The strings must be parallel to each other, but do not need to be parallel to the vehicle.
All wheel-to-string measurements are made perpendicular to the string. Measure from the front and rear edge of each wheel rim to the adjacent string.
Enter the wheelbase using the same unit as the string measurements. This data is needed to calculate if the strings are not parallel to the vehicle.
Enter the actual wheel diameter at the rim edge where you are measuring — not the nominal wheel size. Enter one value for the front axle and one for the rear.
Tire graphics are shown at 100× amplification (capped at 45°) so small angles are clearly visible. Cyan = toe-in, Magenta = toe-out.
Entered data is saved locally on your PC or phone so if you re-visit the page the data will be restored.