This gear ratio reference table shows the gear ratio (to 1) for a range of driven gear teeth values, assuming a drive gear teeth of 10. Every figure is computed with the same engine that powers our Gear Ratio Calculator, so the numbers are exact.
| Driven gear teeth | Gear ratio (to 1) |
|---|---|
| 10 | 1.000 |
| 20 | 2.000 |
| 30 | 3.000 |
| 40 | 4.000 |
| 60 | 6.000 |
| 80 | 8.000 |
| 120 | 12.000 |
| 200 | 20.000 |
| 280 | 28.000 |
| 400 | 40.000 |
How to use this table
Find the row closest to your driven gear teeth and read across to the gear ratio (to 1). For a value between two rows, the real figure sits between them — or enter your exact numbers in the Gear Ratio Calculator for a precise answer.
Need a value that is not in the table? — the Gear Ratio Calculator does it instantly, for free, with the formula and a worked example built in.
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