# Decibel calculator

> Calculates addition and subtraction of decibel sound levels. (iPhone/iPad app by ZPP.)

- Source: https://appshunter.io/ios/app/decibel-calculator/id496124114 (this page in markdown: same URL + `.md`)
- Developer: [ZPP](https://appshunter.io/developer/496124117)
- Category: Utilities
- Price: $0.99
- Age rating: 4+
- Requires: iOS 12.0 · 1 MB
- Languages: American English
- Released: 2012-01-26
- Data updated: 2026-07-03
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/decibel-calculator/id496124114/reviews.md

## What is Decibel calculator?

Sound levels are usually expressed in a logarithmic scale called the decibels (dB). The decibels cannot be added or subtracted directly.
Each operation between decibel values requires to convert the sound level back to a linear scale using an antilog function.
The dB calculator app allows the direct addition or subtraction of dB levels. The app uses the following formula:

A + B = 10*LOG10(10^(A/10) + 10^(B/10)) 

For instance, 5dB + 5dB returns 8dB (3dB is added when doubling the sound level)  or 1dB + 2dB = 4.5dB.

## Key features

- Add decibel levels
- Subtract decibel levels
- Convert dB to linear scale
- Logarithmic scale calculations
- Demonstrates dB addition examples

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/decibel-calculator/id496124114/reviews.md

### 1/5 — Crashes on Launch

*2016-10-02*

I can't actually review the app because it doesn't open on my iPhone 6s Plus running iOS 10. I hope this is a temporary bug.

### 4/5 — Nice little App

*2012-01-26*

Useful if you need to add or subtract dB levels.

## Frequently asked questions about Decibel calculator

### What is the price of Decibel calculator?

Decibel calculator is a paid app priced at $0.99. This one-time purchase grants you access to all its features without any recurring fees.

### Does Decibel calculator have ads?

No, Decibel calculator is ad-free. You can perform your decibel calculations without any interruptions from advertisements.

### What devices is Decibel calculator compatible with?

Decibel calculator is available for iPhone and iPod devices. It is designed to run on these Apple mobile platforms.

### How often is Decibel calculator updated?

The app was last updated on December 14, 2025, indicating recent development and support. This suggests the developer is actively maintaining the application.

### What is the age rating for Decibel calculator?

Decibel calculator has an age rating of 4+. This means it is suitable for users of all ages and does not contain any mature content.

### Can Decibel calculator measure current sound levels?

No, Decibel calculator is designed for mathematical operations on existing decibel values. It does not function as a real-time sound level meter.

### What is the primary function of Decibel calculator?

The primary function of Decibel calculator is to allow users to directly add and subtract decibel (dB) levels, which cannot be done using simple arithmetic due to their logarithmic nature.

## Version history (last 5 releases)

### 2.2.1 — 2025-12-14

Updated age ratings questions.

### 2.2.0 — 2025-02-17

Ensuring the app runs smoothly in iOS 18.

### 2.1.1 — 2021-11-02

correct version number

### 2.1.0 — 2021-11-01

- clarify App Privacy: this app does not collect any data
 - ensure app is running smoothly with iOS 15

### 2.0.4 — 2018-07-25

This app has been updated by Apple to display the Apple Watch app icon.

Works with iOS 11.4.

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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 2026-07-03.*