Gear Ratio Calculator
Calculate gear ratios, speed ratios, torque multiplication, and gear specifications.
Or enter diameter/radius (use same units for both)
Or enter diameter/radius (use same units for both)
Gear efficiency in percentage (typical: 90-98%)
Compound Gear Train: Multiple gear pairs in series. Each pair's output becomes the next pair's input.
Gear Pair 1
Output/Input ratio
Number of teeth on input gear
Result:
Current Formula:
Gear Ratio = Driven Teeth / Driver Teeth
Also equals: Output Speed / Input Speed = Input Torque / Output TorqueGear Ratio Guide:
- Speed Reduction (GR > 1):
- • Decreases output speed
- • Increases output torque
- • Example: 3:1 = 3x torque, 1/3 speed
- Speed Increase (GR < 1):
- • Increases output speed
- • Decreases output torque
- • Example: 0.5:1 = 1/2 torque, 2x speed
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