About Gear Ratio & Gear Train Speed Calculator
Calculate gear ratios for single-stage and 2-stage compound gear trains. Determine output rotational speed (RPM), output torque multiplication (N·m), mechanical advantage, and mesh transmission power losses.
Key Capabilities & Features
- Supports Single-Stage gear pairs and 2-Stage Compound gear trains
- Calculates total gear ratio factor and standard notation (e.g. 5.00:1)
- Computes output shaft speed (RPM) based on input driver speed
- Computes output torque multiplication incorporating mechanical efficiency (η)
- Calculates mechanical advantage and speed reduction factors
How to Use Gear Ratio & Gear Train Speed Calculator
Choose Train Configuration
Select Single Gear Pair or 2-Stage Compound Reduction Train.
Enter Tooth Counts
Input driver pinion teeth and driven bull gear teeth for each stage.
Review Speed & Torque Output
Inspect resulting output shaft RPM and multiplied output torque.
Privacy & In-Browser Execution Guarantee
Client-side transmission engineering engine.
Frequently Asked Questions
What is the formula for a gear ratio?
The gear ratio is the ratio of driven gear teeth (Z2) to driver gear teeth (Z1): Gear Ratio = Z2 / Z1. For compound trains, total ratio is the product of all stage ratios: GR_total = GR1 × GR2.
Does a reduction gearbox increase horsepower?
No. Energy is conserved. A reduction gearbox reduces output speed while increasing output torque, minus a slight percentage (~2% per stage) lost to gear friction.