# RF Link Calc

> Numerical calculation tool for radio engineers modeling RF link characteristics. (iPhone/iPad app by Black Cat Systems.)

- Source: https://appshunter.io/ios/app/rf-link-calc/id303034300 (this page in markdown: same URL + `.md`)
- Developer: [Black Cat Systems](https://appshunter.io/developer/301047032)
- Category: Reference, Utilities
- Price: $2.99
- Rating: 2.30/5 from 3 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 4 MB
- Languages: American English
- Released: 2009-01-23
- Data updated: 2026-08-12
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/rf-link-calc/id303034300/reviews.md

## What is RF Link Calc?

RFLinkCalc is a numerical calculation tool for radio engineers. It models the characteristics of an RF link, including Wireless Internet (WiFi) links. You can compute the maximum distance, required transmitter power level, or gain margin.

You enter in all of the following values (except what you are trying to calculate) and RFLinkCalc does the rest!

Frequency in MHz
Transmitter Power in dBm
Transmitter Antenna Gain in dBi
Transmitter Cable Loss in dB
Distance in miles or kilometers
Receiver Sensitivity in dBm
Receiver Antenna Gain in dBi
Receiver Cable Loss in dB
Gain Margin in dB

The Free Space Loss and Received Signal values are also calculated. 

The EIRP/ERP Calculator computes the EIRP (Effective Isotropic Radiated Power) and ERP (Effective Radiated Power) in both watts and dBm from the transmitter power and antenna gain. The field strength in dBuV/m is also computed for distances of 3 and 10 meters. 

The Field Strength Calculator converts between the following units:
V/m (volts per meter)
dBuV/m (dB relative to one microvolt per meter)
dBuA/m (dB relative to one microamo per meter)
pT (pico Tesla)
dBpT (dB relative to one pico tesla)
Tesla
Gauss
A/m (amperes per meter)
mW/cm² (milliwatts per square centimeter)
W/m² (watts per square meter)

## Key features

- RF link modeling
- Wireless internet link calculations
- Maximum distance computation
- Transmitter power calculation
- Gain margin calculation
- EIRP/ERP calculator
- Field strength calculator

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/rf-link-calc/id303034300/reviews.md

### 1/5 — ******

*2018-07-24*

This apps is not working as it should  and dose not respond to input.
   Please refund my purchase .

### 1/5 — Not what I wonted

*2016-02-17*

Not what I wonted please reinbers me ty

### 5/5 — Awesome app!!!!!!

*2015-11-26*

This is one great app I love all the.  It very helpful.  I also have learned a lot from it.  It took a friend to so me how I can use it but now w I find myself using it a lot.

### 2/5 — This is just a calculator !! Doesn't measure anything

*2014-02-13*

It's a calculator great, not a measuring app

### 1/5 — Consumer advocate

*2009-02-15*

Free app avail.  Search "RF"

## Frequently asked questions about RF Link Calc

### What is RF Link Calc used for?

RF Link Calc is a numerical calculation tool designed for radio engineers. It helps model the characteristics of an RF link, including wireless internet (WiFi) links, to compute parameters like maximum distance, required transmitter power, or gain margin.

### What parameters can I input into RF Link Calc?

You can input frequency (MHz), transmitter power (dBm), transmitter antenna gain (dBi), transmitter cable loss (dB), distance (miles or kilometers), receiver sensitivity (dBm), receiver antenna gain (dBi), and receiver cable loss (dB). The app then calculates the remaining values.

### Does RF Link Calc calculate EIRP and ERP?

Yes, the EIRP/ERP Calculator within RF Link Calc computes the Effective Isotropic Radiated Power (EIRP) and Effective Radiated Power (ERP) in both watts and dBm, based on transmitter power and antenna gain.

### What units does the Field Strength Calculator in RF Link Calc support?

The Field Strength Calculator converts between V/m, dBuV/m, dBuA/m, pT, dBpT, Tesla, Gauss, A/m, mW/cm², and W/m².

### What is the price of RF Link Calc?

RF Link Calc is a paid application priced at $2.99.

### On which devices can I use RF Link Calc?

RF Link Calc is supported on iPhone, iPad, and iPod devices.

### How often is RF Link Calc updated?

The latest version of RF Link Calc is 3.0, and it was last updated on July 28, 2025. It was initially released on January 23, 2009.

### What is the age rating for RF Link Calc?

RF Link Calc has an age rating of 4+.

## Version history (last 5 releases)

### 3.0 — 2025-07-28

Bug fixes and performance improvements.

### 2.0 — 2022-06-09

Bug fixes and performance improvements

### 1.4 — 2017-05-10

Updates for iOS 10.3

### 1.3 — 2013-11-22

Support for iOS 7

### 1.2 — 2013-03-19

Added Field Strength calculations
Added EIRP/ERP calculations

## Apps similar to RF Link Calc

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Mass Time: Find Catholic Mass](https://appshunter.io/ios/app/mass-time-find-catholic-mass/id1438037116) | 4.8 (4,047) | Free | Reference |
| [DoD Systems Engineering](https://appshunter.io/ios/app/dod-systems-engineering/id505317207) | 3.8 (4) | Free | Reference |
| [ClawShelf: OpenClaw Docs](https://appshunter.io/ios/app/clawshelf-openclaw-docs/id6758986679) | — | Free | 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)
- [dB Calc](https://appshunter.io/ios/app/db-calc/id303470503)
- [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

---

*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.*