# Radio & dB Calc

> Radio engineering calculator for dB, noise, and reflection coefficient conversions. (iPhone/iPad app by Dioptase.)

- Source: https://appshunter.io/ios/app/radio-and-db-calc/id376559672 (this page in markdown: same URL + `.md`)
- Developer: [Dioptase](https://appshunter.io/developer/376559675)
- Category: Utilities
- Price: Free
- Rating: 2.00/5 from 1 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 1 MB
- Languages: American English
- Released: 2010-06-12
- Data updated: 2026-08-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/radio-and-db-calc/id376559672/reviews.md

## What is Radio & dB Calc?

Some tools often needed in radio engineering :
- add and subtract values in dB unit
- convert Noise Factor, Equivalent Input Noise Temperature, Spectral Power Noise Density
- convert Return Loss, Reflection Coefficient, VSWR
- compute maximum mismatch loss

## Key features

- Add/subtract dB values
- Convert Noise Factor
- Convert Equivalent Input Noise Temperature
- Convert Spectral Power Noise Density
- Convert Return Loss
- Convert Reflection Coefficient
- Convert VSWR
- Compute maximum mismatch loss

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/radio-and-db-calc/id376559672/reviews.md

### 5/5 — Appli de conversion très pratique

*2023-05-13, version 2.1*

Merci pour ce convertisseur très pratique !

### 5/5 — Super appli !

*2017-04-18, version 2.0*

Merci pour cette mise à jour. 
Vivement linket sur IOS !!

### 5/5 — Great app! Very smart ! Thank you.

*2013-09-18, version 1.2*

Very convenient tool, can we get more like this?

### 5/5 — Great

*2010-06-13*

I've been waiting for an app like this for a while.  Thank you.

## Frequently asked questions about Radio & dB Calc

### What are the main functions of Radio & dB Calc?

Radio & dB Calc helps with adding and subtracting dB values, converting various radio engineering metrics like Noise Factor, Equivalent Input Noise Temperature, Spectral Power Noise Density, Return Loss, Reflection Coefficient, and VSWR. It can also compute maximum mismatch loss.

### Is Radio & dB Calc free to use?

Yes, Radio & dB Calc is available for free. It does not have any in-app purchases or advertisements.

### What devices is Radio & dB Calc compatible with?

Radio & dB Calc is designed for iPhone and iPod devices. It requires iOS 4.0 or later.

### How often is Radio & dB Calc updated?

The latest version of Radio & dB Calc is 2.1, which was released on February 18, 2018. The app has not been updated since then.

### What is the age rating for Radio & dB Calc?

Radio & dB Calc has an age rating of 4+, making it suitable for a wide range of users.

### What is the user feedback on Radio & dB Calc?

Based on the available data, Radio & dB Calc has a rating of 2.0 stars from 1 rating. This indicates a low user satisfaction score.

### Does Radio & dB Calc have ads?

No, Radio & dB Calc does not contain advertisements. It is a completely ad-free application.

### Who developed Radio & dB Calc?

Radio & dB Calc was developed by Dioptase.

## Version history (last 5 releases)

### 2.1 — 2018-02-18

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

Update for iPhone X

### 2.0 — 2017-04-18

Update for iOS10

### 1.2 — 2010-07-18

"Get result" button added to simplify recursive calculation

### 1.1 — 2010-07-02

Tested with iOS 4

### 1.0 — 2010-06-12

No release notes.

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## More apps by Dioptase

- [SatRadio](https://appshunter.io/ios/app/satradio/id1497481844)
- [GeoTrackEvolab](https://appshunter.io/ios/app/geotrackevolab/id1523010581)

All apps by Dioptase: https://appshunter.io/developer/376559675

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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 2026-08-07.*