Speedometer Gear Calculator
Calculates the speedometer gear teeth needed for a given tire size, rear gear ratio, and speedometer gear teeth.
Speedometer Gear Calculator gives you a faster way to work through practical calculation scenarios without rebuilding the same calculation from scratch every time. Start with Tire Circumference (inches), Rear Gear Ratio, Speedometer Gear Teeth, and Driven Gear Teeth (usually 1 or 2) and use the live outputs to estimate Calculated Speedometer Gear Teeth and Speedometer Error (mph) in one pass. This page is built to help you compare scenarios quickly, validate rough assumptions, and move into a related calculator when you need a second angle on the same problem.
Use The Calculator In A Few Steps
Work through the inputs deliberately, then compare outputs instead of relying on a single scenario.
Scenario Checks
Use these examples to verify the behavior of the calculator before you run your own values.
What Users Usually Need Next
Keep the calculator open while you skim these answers so you can test the scenario that matters.
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