About the Gear Ratio Calculator Online Free Tool

The Gear Ratio Calculator Online Free Tool computes a simple driven-to-driver tooth ratio and the resulting output speed for a single gear stage.

How to Use the Gear Ratio Calculator Online

1. Enter driver and driven gear tooth counts.
2. Enter the input speed in rpm.
3. Run the calculator to see the gear ratio and output speed.

Choosing Options Correctly

Use actual tooth counts for one meshing stage. Multi-stage gearboxes require multiplying stage ratios, and real output torque depends on efficiency, tooth strength, bearings, lubrication, and service factor.

Common Use Cases

• Estimate speed reduction for a gear pair.
• Compare alternate tooth-count combinations.
• Check whether a motor speed matches a target output speed.

Quick FAQ

Does this calculate torque?
It reports speed and ratio relationships. Torque change is proportional to ratio only in an ideal system; real drives need efficiency and load checks.

Can I use it for belts or chains?
Yes for simple driver/driven ratio checks when the effective pitch diameters or tooth counts are known.

What input mistake causes bad ratios?
Reversing driver and driven values flips the speed result. Check which member is powered before using the output.

Does it account for gear efficiency?
No. Gear mesh losses, bearing losses, lubrication, and load conditions must be applied separately for design work.