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Gear Mesh Frequency Calculator

Calculate GMF, Shaft Frequencies, and Sidebands for Gearbox Analysis

Gear Mesh Frequency (GMF) = Number of Teeth × Shaft RPM ÷ 60

Gear Train Visualization
Input 25 teeth Output 50 teeth GMF 1800 RPM 900 RPM Ratio: 2.00:1

Understanding Gear Mesh Frequencies

GMF appears at tooth count × shaft speed. Sidebands spaced at shaft speed indicate wear or damage.

Hunting Tooth Frequency = GMF ÷ (Assembly Phase × Common Factor). Indicates pattern of tooth contact.
Input Shaft Speed
1800 RPM
100 RPM Input Shaft Freq: 30.0 Hz 10000 RPM
Gear Configuration
Stage 1 (Input Mesh)
+ Add Gear Stage (for multi-stage gearboxes)
Common Gearbox Presets
Calculated Frequencies
Input Shaft
30.0
Hz
1.00x input speed
Input shaft rotation frequency
Output Shaft
15.0
Hz
0.50x input speed
Output shaft rotation frequency
Gear Mesh Frequency (GMF)
750.0
Hz
25.00x input speed
Teeth × Shaft Speed
2x: 1500.0 | 3x: 2250.0
Hunting Tooth Freq
0.60
Hz
0.02x input speed
Full mesh pattern repeat
GMF Sidebands (Indicates Gear Wear)
GMF - 2×Input: 690.0 Hz
GMF + 2×Input: 810.0 Hz
GMF - 1×Input: 720.0 Hz
GMF + 1×Input: 780.0 Hz
GMF - 1×Output: 735.0 Hz
GMF + 1×Output: 765.0 Hz
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