# dB Calc — dB / Neper / Power / Voltage

> RF signal measurement unit converter for decibels, nepers, power, and voltage ratios. (iPhone/iPad app by Black Cat Systems.)

- Source: https://appshunter.io/ios/app/db-calc/id303470503 (this page in markdown: same URL + `.md`)
- Developer: [Black Cat Systems](https://appshunter.io/developer/301047032)
- Category: Reference, Education
- Price: $0.99
- Rating: 5.00/5 from 5 App Store ratings · 10 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 1 MB
- Languages: American English
- Released: 2009-01-28
- Data updated: 2026-08-12
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/db-calc/id303470503/reviews.md

## What is dB Calc?

Need to quickly convert between various RF signal measurement units? dB Calc performs lots of decibel related conversions: 

Decibel / Neper / Ratio Conversions: 
Enter in either the dB, Np (nepers), power or voltage ratio, and the other values will be calculated.

Decibel / Power / Voltage Calculations: 
Enter in the one known value, and the others will be calculated. Select the correct units before entering in the value. You can change the units of the displayed (calculated values) by selecting the new units. Enter in the resistance before entering in the known value. 

The following units are available: 
dBmW - dB ref to 1 mW power 
dBuV - dB ref to 1 uV 
dBu - dB ref to 0.7746 V (audio) 
dBV - dB ref to 1 V 

uW - microwatts 
mW - milliwatts 
W - watts 

uV - microvolts 
mV - millivolts 
V - volts 

RMS Waveforms Conversions: 
Conversion between rms, peak, peak-peak voltage and current values for a user entered resistance. Sine, square, and triangle waveforms are supported.

Get your copy of dB Calc today, and take the hassle out of dB related conversions.

## Key features

- Decibel/Neper/Ratio Conversions
- Decibel/Power/Voltage Calculations
- Multiple Unit Support (dBmW, dBuV, Watts, Volts)
- RMS Waveform Conversions
- Sine, Square, Triangle Waveform Support
- Resistance Input for Calculations

## Recent user reviews (10 of 10)

All indexed reviews: https://appshunter.io/ios/app/db-calc/id303470503/reviews.md

### 5/5 — Several year user

*2024-06-09*

Been using for five years for repeater maintainence. Quick and easy to use. An amazing range of tests and scales. I couldn’t work without it since I retired my slide rule. The battery wore out(!).

### 5/5 — please

*2022-07-28*

I don’t need any upgrades of function but please fix display forced landscape I still need this app

### 5/5 — M

*2015-01-26*

Very handy. I use it all the time to check progress when designing and building tube guitar amps.

### 5/5 — Excellent tool for quick calculations

*2014-08-07*

Use the app every day and find it to be very useful and accurate.

### 5/5 — Perfect

*2013-11-20*

Use it daily.

### 5/5 — A very useful application.

*2013-11-18*

I find this application to be very useful in my day-to-day work as an RF engineer it's really quite nice.

### 2/5 — Good start

*2010-10-06*

A nice app but needs a lot more.  I would delete the top section and expand on the middle section to include additional RF and dB conversions.  It will then become a nice and handy tool.

### 4/5 — A handy app

*2009-11-21*

A handy app for E.E.'s, but personally I'd drop the Neper to make room for V1 V2 fields in addition to the ratio field.

### 2/5 — dB

*2009-09-25*

Bis auf ein redet oder clear Button der fehlt, ist alles okay. für 79 Cent bietet das App. leider zu wenig settings. Update der Bedienung und weitere . Wünsche mir ein update mit einzelner db Berechnung bei der zwischen Pegel dbspl dbu Pa USW. geswitcht werden kann.

### 5/5 — Specialized and useful

*2009-04-28*

This app was exactly what I was looking for. Quick conversion between dB based units. Very useful. Creator very responsive to feedback and requests.

## Frequently asked questions about dB Calc

### What RF signal units can dB Calc convert between?

dB Calc supports conversions for decibels (dB), nepers (Np), power ratios (mW, W), and voltage ratios (uV, mV, V). It also includes specific units like dBmW and dBuV.

### Does dB Calc support waveform conversions?

Yes, dB Calc can convert between RMS, peak, and peak-peak voltage and current values for sine, square, and triangle waveforms, given a user-entered resistance.

### What devices is dB Calc available on?

dB Calc is available for iPhone, iPad, and iPod devices.

### How often is dB Calc updated?

The latest version of dB Calc was released on July 9, 2025, indicating active development and updates.

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

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

### What are the different unit options in dB Calc?

dB Calc offers units such as dBmW, dBuV, dBu (audio), dBV, uW, mW, W, uV, mV, and V for various calculations.

### How does dB Calc handle resistance in calculations?

You need to enter the resistance value before performing calculations involving power or voltage ratios, especially for RMS waveform conversions.

### What is the price of dB Calc?

dB Calc is a paid application, priced at $0.99.

## Version history (last 5 releases)

### 3.0 — 2025-07-09

Changes and improvements for new iOS updates.

### 2.0 — 2022-05-04

Updates for latest iOS

### 1.6 — 2017-05-09

Updates for iOS 10.3

### 1.5 — 2013-10-28

Updates for iOS 7

### 1.4 — 2013-01-04

Updates for iOS 6

## Apps similar to dB Calc

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [BO6 Camo Tracker](https://appshunter.io/ios/app/bo6-camo-tracker/id6733240293) | 4.6 (123) | $0.99 | Reference |

## More apps by Black Cat Systems

- [WireCalc](https://appshunter.io/ios/app/wirecalc/id301047029)
- [Transmission Line Calc](https://appshunter.io/ios/app/transmission-line-calc/id302734281)
- [RF Link Calc](https://appshunter.io/ios/app/rf-link-calc/id303034300)
- [Drill Calc](https://appshunter.io/ios/app/drill-calc/id304434324)
- [Photon Calc](https://appshunter.io/ios/app/photon-calc/id304436071)

All apps by Black Cat Systems: https://appshunter.io/developer/301047032

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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 2026-08-12.*