Circular Membrane Frequency Calculator
Calculate selected ideal circular membrane modes from uniform tension, areal mass and radius.
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Result
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Calculation steps
Work through one step at a time or reveal the complete calculation. The steps use your current inputs.
How to calculate
Use selected positive zeros of cylindrical Bessel Jm for a membrane clamped at its circular rim.
fmn=jmn/(2π radius)×sqrt(tension/areal mass)
Worked example
Doubling radius halves every modeled mode frequency at unchanged tension and areal density.
Assumptions and input details
Ideal thin flexible uniformly tensioned membrane, small transverse motion and fixed rim. No bending stiffness, air loading, tension gradients, damping or real drum tuning/safety claim.
Unit definitions
Unit selection is independent of language. Each selector contains only units for its physical quantity. Calculations use defined base units internally.
Choose from 23 length definitions, including explicitly labelled regional measures. Area conversions square the length factor; geometric volumes cube it.
Regional measures are not interchangeable merely because their names look similar. This is a documented selection, not a claim to include every historical unit.
NIST measurement tables · Japanese traditional units · Mainland China and Hong Kong unit distinctions
Using this calculator
Can I enter my own problem?
Yes. Replace the example values with your own inputs. The result, calculation steps, tables and applicable diagrams update from those inputs. Blank or invalid values clear the result; example values are never silently substituted for missing inputs.
Are the results exact?
Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
Is my input uploaded?
The calculation runs in your browser. No account, file upload or external AI service is required. Inputs are not saved between page reloads.
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