About Offset Wiz

Offset Wiz is a free tool that helps car and truck enthusiasts figure out how aftermarket wheels will fit their vehicle. Whether you're comparing a new wheel setup against your stock specs or just need to convert between offset and backspacing, Offset Wiz does the math instantly.

How It Works

The Compare Setups calculator takes the width and offset of your stock wheels and your new wheels, then calculates exactly how much further in or out the new setup will sit. It shows the change at both the inner edge (toward the suspension) and the outer edge (toward the fender), so you can tell at a glance whether your new wheels will poke, tuck, or sit flush.

The Offset/Backspacing converter handles the math between these two common fitment measurements. Just enter the wheel width and either value, and the other is calculated instantly.

Privacy First

Everything happens in your browser. Offset Wiz does not collect, store, or transmit any of the information you enter. There are no accounts, no logins, and no tracking of your inputs. We use Google Analytics to understand general traffic patterns, but your calculator inputs never leave your device.

Part of the Wiz Network

Offset Wiz is part of a growing collection of free, no-nonsense calculator tools. Each one is designed to do one thing well — fast, ad-supported, and free to use. You can explore the full collection at Fave Wiz.

Get in Touch

Have a question, suggestion, or found a bug? We'd love to hear from you. Reach out through our contact page.