Toe & Camber Alignment Calculator
Convert toe between millimetres, degrees and minutes — where an eighth of an inch is 0.478 degrees on a 15 inch wheel and 0.377 on a 19.
A linear toe measurement is taken across the wheel at hub height, so it converts through the rim diameter rather than the tyre's. Some specifications quote toe per wheel and some quote the total across the axle, which differ by a factor of two and are rarely labelled — check which one you have before dialling anything in. Nothing is uploaded.
An inch of toe and a degree of toe are not the same spec
Toe is an angle, but it gets measured as a distance across the rim — so converting between the two runs through the wheel diameter. An eighth of an inch is 0.4775° on a 15-inch wheel and 0.3769° on a 19-inch one: the same measurement, the same car, and a difference of nearly 27% in what the wheels are actually doing.
| Wheel | ⅛ inch of toe is | 0.1° is | 1° of camber leans |
|---|---|---|---|
| 14" | 0.5116° | 0.621 mm | 6.21 mm |
| 15" | 0.4775° | 0.665 mm | 6.65 mm |
| 16" | 0.4476° | 0.709 mm | 7.09 mm |
| 17" | 0.4213° | 0.754 mm | 7.54 mm |
| 18" | 0.3979° | 0.798 mm | 7.98 mm |
| 19" | 0.3769° | 0.842 mm | 8.42 mm |
| 20" | 0.3581° | 0.887 mm | 8.87 mm |
Note the middle column: a tenth of a degree is 0.62 mm on a 14" wheel and 0.89 mm on a 20" — under a millimetre either way. That is why toe is quoted in minutes of arc and why it is not a job for a tape measure.
So a spec carried onto bigger wheels quietly changes
Fit bigger wheels, dial in the same inch figure the workshop used last time, and the car ends up with less toe than it had. Fifteens to nineteens loses 26.7% of the angle, and even a two-inch jump costs over ten. The shift is simply the diameter ratio — and nothing about the measurement announces it, because the tape reads exactly the same both times.
| Wheel change | Was | Becomes | Angle lost |
|---|---|---|---|
| 15" → 17" | 0.4775° | 0.4213° | 13.33% |
| 15" → 19" | 0.4775° | 0.3769° | 26.67% |
| 16" → 18" | 0.4476° | 0.3979° | 12.50% |
| 17" → 20" | 0.4213° | 0.3581° | 17.65% |
| 18" → 20" | 0.3979° | 0.3581° | 11.11% |
For scale: a common front spec is about 6 minutes of arc, which is 0.75 mm across a 17-inch rim. An eighth of an inch is a long way past that. And camber is more visible than it sounds — a single degree leans the top of a 19-inch rim over 8.4 mm.
| Spec | Degrees | Minutes | On a 17" rim |
|---|---|---|---|
| Zero | 0.0000° | 0.0′ | 0.000 mm |
| Light toe-in | 0.0500° | 3.0′ | 0.377 mm |
| Common front spec | 0.1000° | 6.0′ | 0.754 mm |
| Firm toe-in | 0.2000° | 12.0′ | 1.507 mm |
| An eighth of an inch on a 17 | 0.4213° | 25.3′ | 3.175 mm |
How to use
- Enter your wheel diameter in inches.
- Enter the toe as a measurement across the rim, or in degrees.
- Enter a camber angle if you want the lean in millimetres.
- Compare the same spec across other wheel sizes.
Frequently asked questions
How do I convert toe from millimetres to degrees?
Take the arctangent of the measurement over the rim diameter in millimetres. It runs through the wheel size, which is why the two units are not interchangeable between different wheels.
How much difference does the wheel size make?
A great deal. An eighth of an inch of toe is 0.478 degrees on a 15 inch wheel and 0.377 on a 19 — nearly 27% apart for an identical measurement on the same car.
What if I fit bigger wheels?
Carrying the same INCH figure across leaves you with less toe than before. Fifteens to nineteens loses 26.7% of the angle, and even a two inch jump costs over ten percent. Nothing about the tape measure announces it.
Can I set toe with a tape measure?
Not really. A tenth of a degree is under a millimetre on any wheel up to about 22.5 inches — 0.62 mm on a 14 and 0.89 on a 20. That is why specifications are quoted in minutes of arc.
What is a typical toe specification?
Around a tenth of a degree of toe-in at the front, which is six minutes of arc, or about 0.75 mm across a 17 inch rim. An eighth of an inch is a long way past that.
How much does a degree of camber actually lean?
More than it sounds. One degree tips the top of a 19 inch rim over 8.4 mm — which is why a degree and a half of negative camber is clearly visible standing in front of the car.
Is my spec per wheel or total?
Check, because they differ by a factor of two and are rarely labelled. Some manufacturers quote toe for each wheel and some quote the total across the axle, and setting one to the other doubles or halves it.
Does this send anything anywhere?
No. Every figure is computed in your browser, and nothing is uploaded or stored.
🔒 This tool runs entirely in your browser. Nothing you enter is uploaded, logged, or stored.