Cariko Luthier Tools

Monopole Mobility Calculator

Enter the measured guitar-top deflection, uncoupled top resonance, and test weight to calculate stiffness, effective modal mass, and monopole mobility.

mm
Example: 0.15 mm
Hz
Example: 155 Hz
kg
Example: 1 kg
Static stiffness 65,378 N/m
Effective modal mass 68.9 g
Monopole mobility 14.90 × 10−3 s/kg
Mobility indicator High mobility
14.90
6 10 14 18 22

This result indicates a relatively responsive top. Mobility should be considered alongside structural strength, voicing goals, and the instrument’s overall design.

View calculation formulas

Force: test mass × gravitational acceleration

Static stiffness: force ÷ deflection

Effective modal mass: stiffness ÷ (2π × resonance frequency)²

Monopole mobility: 1000 ÷ √(stiffness × effective modal mass)

This calculator is intended as a measurement and comparison tool. Results should be interpreted within the context of the guitar’s construction, materials, bracing, and design goals.