InputTestHub

Wheel Offset Calculator

Compares two wheel width and offset combinations and shows how far each edge moves inward or outward.

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Enter your figures and press Calculate.
In short Wheel Offset Calculator is a free online tool on inputtesthub.com that compares two wheel width and offset combinations and shows how far each edge moves inward or outward. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Wheel Offset Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Wheel Offset Calculator

The Wheel Offset Calculator compares two wheel width and offset combinations and shows how far each edge moves inward or outward. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Checking whether a wider wheel will foul the suspension.
  • Working out how much a wheel will sit proud of the arch.
  • Sizing a spacer.

Details

ETDistance from mounting face to centreline
Lower ETWheel sits further out
Inner edgeThe one that fouls suspension
Check atFull lock and full compression

The maths behind it

This tool uses Half-width = wheel width in mm ÷ 2. Inner edge = half-width − offset; outer edge = half-width + offset. Comparing the two gives the movement at each edge. Every intermediate value is shown on screen, so the result can be checked by hand.

The inner figure matters most: move inward and the tyre can foul the strut, caliper or a suspension arm — often only under compression or at full lock, which is exactly when you least want to find out. Check both edges with the suspension loaded and the wheels turned fully.

Frequently asked questions

Is the Wheel Offset Calculator free?
It is free, with no account, no trial and no daily cap. Every calculators tool on inputtesthub.com works the same way: open the page and use it.
Is my data uploaded anywhere?
No. The Wheel Offset Calculator runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What is the equation behind the Wheel Offset Calculator?
It uses Half-width = wheel width in mm ÷ 2. Inner edge = half-width − offset; outer edge = half-width + offset. Comparing the two gives the movement at each edge. The full working is printed under the result, so you can follow every step rather than trusting a black box.
When would I actually need the Wheel Offset Calculator?
The most common reasons people reach for it: checking whether a wider wheel will foul the suspension. Working out how much a wheel will sit proud of the arch. Sizing a spacer. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Any caveats I should know about?
The inner figure matters most: move inward and the tyre can foul the strut, caliper or a suspension arm — often only under compression or at full lock, which is exactly when you least want to find out. Check both edges with the suspension loaded and the wheels turned fully.
What are the reference figures here?
ET is Distance from mounting face to centreline. Lower ET is Wheel sits further out. Inner edge is The one that fouls suspension. These are printed on the page itself, so you do not have to take them on trust.
Is the number rounded?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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