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Differential Gear Ratio Calculator
Final drive ratio, engine rpm and speed from differential and tyre sizes.
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Differential ratio
Compare Your Options And Get Clear Answers
Final drive ratio, engine rpm and speed from differential and tyre sizes.
Differential Gear Ratio Estimator
Enter your numbers below for an instant estimate.
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💡 Tip: Ratio = ring teeth / pinion teeth.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Differential Quick Guide
Typical values for reference.
| Ring | Pinion | Top gear | Ratio |
|---|---|---|---|
| 41 | 10 | 1 | 4.10:1 |
| 41 | 11 | 0.75 | 3.73:1 |
| 37 | 10 | 1 | 3.70:1 |
| 43 | 11 | 1 | 3.91:1 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Differential Gear Ratio Calculator FAQ
Answers to common questions about this calculator.
Ring gear teeth divided by pinion teeth.
The pinion turns 3.73 times for each wheel turn.
Yes, taller tyres act like a taller gear.
Ignores slip.