Acoustic Interface Transmission Calculator
Calculate pressure-amplitude and energy coefficients for normal-incidence sound at a lossless impedance interface.
YOUR CALCULATION
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 real positive characteristic impedances and separate pressure amplitudes from transmitted power.
Pressure r=(Z2−Z1)/(Z2+Z1), t=2Z2/(Z2+Z1); power R=r²,T=4Z1Z2/(Z1+Z2)²
Worked example
Equal impedances give no reflected energy and100% transmitted energy, with pressure transmission amplitude1.
Assumptions and input details
Infinite fluid half-spaces, plane waves, normal incidence and no absorption or solid shear modes. No finite wall, room acoustics, material impedance catalogue, sound insulation rating or safety interpretation.
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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