Align your car at home with two strings and a ruler
Before
▲ FRONT
front
rear
front
rear
STRING
—
–
—
–
Front Toe
—
–
Thrust
—
–
Rear Toe
—
–
—
–
—
–
STRING
front
rear
front
rear
▼ REAR
Optional
Front Track
—
Rear Track
—
Track Difference
—
After
—
—
—
▲ FRONT
front
rear
front
rear
STRING
—
–
—
–
Front Toe
—
–
Thrust
—
–
Rear Toe
—
–
—
–
—
–
STRING
front
rear
front
rear
▼ REAR
Optional
---
Front Track
—
Rear Track
—
Track Difference
—
Difference (After − Before)
Individual Wheel Toe Δ
FL Toe
—
–
FR Toe
—
–
RL Toe
—
–
RR Toe
—
–
Summary Δ
Front Toe Δ
—
–
Rear Toe Δ
—
–
Thrust Angle Δ
—
–
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.
String angle visualization is to assist understanding, not because they need to be parallel to the car.
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.
Enter your measurements before alignment in the Before panel and after in the After panel. The Difference panel shows the change (After − Before). Swipe left/right on mobile to access before, after, and difference pages.
Entered data is saved locally on your device so re-visiting the page will restore your data.