# dB Calc Pro — Acoustic Math for Engineers

> Acoustic Math for Engineers (iPhone/iPad app by Matthias Schorer.)

- Source: https://appshunter.io/ios/app/db-calc-pro/id910023114 (this page in markdown: same URL + `.md`)
- Developer: [Matthias Schorer](https://appshunter.io/developer/290579382)
- Category: Utilities
- Price: $2.99
- Age rating: 4+
- Requires: iOS 17.6 · 16 MB
- Languages: American English, German (Germany)
- Released: 2014-09-21
- Data updated: 2026-08-17
- User reviews in markdown: https://appshunter.io/ios/app/db-calc-pro/id910023114/reviews.md

## What is dB Calc Pro?

Precision Engineering for Acoustic Professionals dB Calc Pro is a specialized utility designed for acoustic engineers, environmental consultants, and sound technicians who require rapid, accurate, and field-ready decibel calculations. Moving beyond basic arithmetic, this app handles the complex logarithmic nature of sound with a suite of industry-standard formulas.

Key Technical Capabilities:
- Logarithmic Summation & Averaging: Effortlessly calculate the total energy sum or arithmetic mean of multiple sound pressure levels.
- Background Noise Correction: Isolate target signal levels by subtracting interference and background noise using professional compensation algorithms.
- Distance-Based Propagation: Predict sound reduction over distance from a point source in a free field, accounting for slant distance and height.
- Enclosing Surface (Box Source) Analysis: Seamlessly convert between sound power level and sound pressure level based on the dimensions of a boxr-shaped surface.
- Wizard-Style Entry: Minimize input errors with a structured, step-by-step entry system for complex multi-parameter calculations.

Optimized for the Field:
- Left-Handed Ergonomics: A dedicated mode that mirrors the interface, placing the numeric keypad on the left for comfortable one-handed operation.
- Technical Precision: Results are formatted according to engineering standards, featuring scientific subscripts and precise units
- Reference Guide: Integrated formula library for on-the-spot verification of acoustic principles.


## Version history (last 5 releases)

### 3.1 — 2026-01-05

- Safety Guardrails: Integrated input validation prevents physically impossible decibel entries (> 200 dB) while allowing for unrestricted distance and dimension inputs.
- Adaptive Layouts: Bug fixed for large iPhone screens and landscape use with an "elastic" keypad and flexible UI components that prevent clipping.

### 3.0 — 2026-01-02

- Advanced Calculation Wizards: Specialized modules for Sound Level Summation/Averaging, Interference Compensation, Distance-based Propagation, and Box-Shaped Source (Enclosing Surface) analysis.
- Slot-Based Data Logic: A robust entry system that remembers specific parameter slots. Deleting a measurement now intelligently prompts for that specific missing value.
- Smart Keypad Behavior: Enhanced "C" and "CA" logic—clear your current typing buffer with one tap, or reset the entire calculation with two.
- Ergonomic Layouts: Built-in Left-Handed Mode flips the interface for optimal one-handed operation in the field.

### 2.0 — 2019-08-29

Support for iPhones with FaceID

### 1.5 — 2016-10-11

Uses taptic engine on devices where it is available

### 1.4 — 2015-04-24

fixed crash on iOS 8.3

## More apps by Matthias Schorer

- [VI Reference](https://appshunter.io/ios/app/vi-reference/id293621569)
- [dBMeter Pro](https://appshunter.io/ios/app/dbmeter-pro/id296264086)
- [RevMeter Pro](https://appshunter.io/ios/app/revmeter-pro/id357421594)
- [Trek Quest HD](https://appshunter.io/ios/app/trek-quest-hd/id391294299)
- [Phaser Type I](https://appshunter.io/ios/app/phaser-type-i/id413053673)
- [Tutum Nube](https://appshunter.io/ios/app/tutum-nube/id469814979)

All apps by Matthias Schorer: https://appshunter.io/developer/290579382

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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 2026-08-17.*