Noise Reduction Coefficient Calculator

Analyze sound flanking transmission paths. Input the STC of the direct path and each flanking path (walls, floor, ceiling) to find the apparent STC and weakest link.

Inputs

Direct path STC

Flanking wall 1 STC

Flanking wall 2 STC

Flanking floor STC

Flanking ceiling STC

Tab to move between fields

Results

Apparent STC

47.4

Flanking penalty (dB)2.6

Weakest path (0-4)0

Weakest path contribution (%)54.6

Max achievable STC50

Improvement potential (dB)2.6

How to Use This Calculator

Enter Direct path STC, Flanking wall 1 STC, and Flanking wall 2 STC.
Set Flanking floor STC and Flanking ceiling STC.
Review the Apparent STC result.
Use Flanking penalty (dB) and Weakest path (0-4) to inform your decision.

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