# Distance Attenuation Calc — Sound Level dB in Distance

> Physics calculator for sound level decrease with distance. (iPhone/iPad app by Tan Chia Ling.)

- Source: https://appshunter.io/ios/app/distance-attenuation-calc/id1410067988 (this page in markdown: same URL + `.md`)
- Developer: [Tan Chia Ling](https://appshunter.io/developer/321121189)
- Category: Utilities, Productivity
- Price: $2.99
- Rating: 3.70/5 from 3 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 13 · 1 MB
- Languages: American English
- Released: 2018-07-30
- Data updated: 2026-07-07
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/distance-attenuation-calc/id1410067988/reviews.md

## What is Distance Attenuation Calc?

The Distance Attenuation Calculator is a physics/math calculator designed to find the sound level in dB decreases with distance from the sound source quickly and easily.

Features:
- Instant calculation.
- Results are copyable to other apps.
- Formulas are included as reference.
- Supports up to 16 decimal places.
- Supports various units for each input.
- Works seamlessly on both iPhone and iPad.
- Lightweight, compact app optimized for everyday use.
- Ad-free and built with privacy in mind.

Distance attenuation is defined as the way in which a sound level [dB] reduces as a listener moves away from a sound source. As sound travels from the source, the area over which the sound is spread increases like ripples on a pond. This means that the same amount of acoustic energy is dispersed over a greater area, and as a result, the sound level at any position on this area reduces as the distance from the source is increased.

Sound attenuation describes how the SPL [dB] changes with increasing distance from the sound source.

The sound attenuation formula is as follows:

SPL₂ = SPL₁ - 20 * log (D₂ / D₁)

Where:
SPL₁ - Sound Pressure Level [dB] at point 1
SPL₂ - Sound Pressure Level [dB] at point 2
D₁ - Distance from the sound source to point 1
D₂ - Distance from the sound source to point 2

Thanks for your support, and do visit nitrio.com for more apps for your iOS devices.

## Key features

- Instant sound level calculation
- Copyable results
- Included reference formulas
- Supports 16 decimal places
- Multiple unit support
- Ad-free and privacy-focused

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/distance-attenuation-calc/id1410067988/reviews.md

### 1/5 — Loved it - now not so much

*2023-12-10*

Might be IO updates but can’t change values anymore

## Frequently asked questions about Distance Attenuation Calc

### What is Distance Attenuation Calc?

Distance Attenuation Calc is a physics and math calculator that helps you determine how sound levels in decibels (dB) decrease as you move further away from a sound source. It offers instant calculations and includes the relevant formulas for reference.

### How does Distance Attenuation Calc work?

The app uses the principle of distance attenuation, where sound energy disperses over a larger area as it travels. It applies the formula SPL₂ = SPL₁ - 20 * log (D₂ / D₁) to calculate the reduced sound pressure level (SPL₂) at a new distance (D₂).

### Does Distance Attenuation Calc have ads?

No, Distance Attenuation Calc is ad-free. The app is built with privacy in mind and is optimized for everyday use without interruptions from advertisements.

### What devices is Distance Attenuation Calc compatible with?

Distance Attenuation Calc works seamlessly on both iPhone and iPad devices. It is designed to be a lightweight and compact utility for your iOS devices.

### What is the price of Distance Attenuation Calc?

Distance Attenuation Calc is available for a one-time purchase of $2.99. This price grants you access to all its features without any recurring fees or in-app purchases.

### How often is Distance Attenuation Calc updated?

The latest version of Distance Attenuation Calc is 1.3, last updated on February 23, 2026. While specific update frequency isn't detailed, this indicates ongoing support and development.

### What is the age rating for Distance Attenuation Calc?

Distance Attenuation Calc has an age rating of 4+. This indicates it is suitable for users of all ages and does not contain any content that would be considered inappropriate for younger audiences.

### Can I copy the results from Distance Attenuation Calc?

Yes, the results calculated by Distance Attenuation Calc are copyable. This feature allows you to easily transfer the computed sound level data to other applications for further use or documentation.

## Version history (last 4 releases)

### 1.3 — 2026-02-23

- Updated for the newest devices.
- Minor bugs fixed.

### 1.2 — 2024-04-01

- Updated for the newest devices.
- Minor UI update.
- Minor bugs fixed.

### 1.1 — 2021-01-23

- Update for Newest Devices
- Bug Fixed

### 1.0 — 2018-07-20

No release notes.

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## More apps by Tan Chia Ling

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All apps by Tan Chia Ling: https://appshunter.io/developer/321121189

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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 2026-07-07.*