Gear Ratio & RPM Calculator — Free Online Calculator & Formula Guide
Calculate output RPM, output torque, or gear ratio for any gear system. Supports speed reduction, overdrive, and compound gear train analysis.
✓ Formula verified: January 2026
Gear Ratio
Results below
Enter Values
Output Speed
600 RPM
Gear Ratio
3:1
Type
Speed Reduction / Torque Multiplication
Output Torque (95% efficiency)
▲ 285 N·m
What if your input rpm changes? 1620 RPM → 540 RPM · 1800 RPM → 600 RPM · 1980 RPM → 660 RPM
Scenario Comparison
Conservative (5%)
$16,470.09
$6,470.09 interest
Your scenario (7%)
$20,096.61
$10,096.61 interest
Aggressive (10%)
$27,070.41
$17,070.41 interest
High-risk (14%)
$40,224.71
$30,224.71 interest
Best return
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Gear Ratio
Gear Ratio
3:1
Speed Reduction / Torque Multiplication
Output Speed
600 RPM
Output Torque (95% efficiency)285 N·m
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