# TR15 Acoustic Calculator — Sound transmission calculator

> Sound transmission calculator (iPhone/iPad app by American Wood Council.)

- Source: https://appshunter.io/ios/app/tr15-acoustic-calculator/id1507190662 (this page in markdown: same URL + `.md`)
- Developer: [American Wood Council](https://appshunter.io/developer/380481346)
- Category: Business, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 8.0 · 157 MB
- Released: 2020-04-10
- Data updated: 2026-06-11
- User reviews in markdown: https://appshunter.io/ios/app/tr15-acoustic-calculator/id1507190662/reviews.md

## What is TR15 Acoustic Calculator?

Based upon the data and methodologies compiled in American Wood Council's Technical Report No. 15 (TR15), this calculator simplifies the calculation of sound transmission through wood-frame floor and ceilings.  Sound transmission class (STC) and Impact insulation class results are given as well as the following detail data at ⅓ octave band center frequency ranging from 125 Hz to 4000 Hz:

TL / STC:
- Floor Layer Estimated Transmission Loss
- Ceiling Layer Estimated Transmission Loss
- System Effect
- Estimated Transmission Loss
- ASTM E413 Reference Contour
- STC shifted Reference Contour
- Estimated Transmission Loss Deficiencies

ISPL / IIC:
- STC Transmission Loss 
- ISPL Adjustment
- Estimated Impact Sound Pressure Level
- ASTM E989 Reference Contour
- Shifted Reference Contour
- Impact Insulation Deficiencies


## Version history (last 3 releases)

### 1.0.6 — 2020-07-01

Improved diagnostics

### 1.0.5 — 2020-06-09

Fixed:
- Insulation options for G.C. Topped assemblies;

### 1.0.2 — 2020-04-10

No release notes.

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All apps by American Wood Council: https://appshunter.io/developer/380481346

## Related topics

[tr15 acoustic calculator](https://appshunter.io/ios/topics/tr15-acoustic-calculator)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-11.*