# Transmission Line Calc — RF transmission line calc

> RF transmission line calculator for impedance, attenuation, SWR, and power. (iPhone/iPad app by Black Cat Systems.)

- Source: https://appshunter.io/ios/app/transmission-line-calc/id302734281 (this page in markdown: same URL + `.md`)
- Developer: [Black Cat Systems](https://appshunter.io/developer/301047032)
- Category: Reference, Lifestyle
- Price: $2.99
- Rating: 4.10/5 from 8 App Store ratings · 8 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 3 MB
- Languages: American English
- Released: 2009-01-22
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/transmission-line-calc/id302734281/reviews.md

## What is Transmission Line Calc?

Transmission Line Calc allows you to perform several calculations related to RF transmission lines.

After selecting from one of 53 different transmission lines, you specify the length and operating frequency. The characteristic impedance and velocity factor of the cable is displayed, and the attenuation (loss) as well as electrical length (in wavelengths and degrees) is displayed.

Next, you can specify the impedance (both resistive and reactive) and whether this is measured at the input to the transmission line or the load. The impedance at the other end of the transmission line is calculated, as well as the SWR (Standing Wave Ratio) for both ends.

The loss due to the SWR is then calculated and displayed, as well as the total loss.

Next, you can enter in the input power, the loss due to the cable as well as SWR is displayed, and the net power out.

Supported cable types:
Belden 8215 (RG-6A)
Belden 8237 (RG-8)
Belden 9913 (RG-8)
Belden 9258 (RG-8X)
Belden 8213 (RG-11)
Belden 8261 (RG-11A)
Belden 8240 (RG-58)
Belden 9201 (RG-58)
Belden 8219 (RG-58A)
Belden 8259 (RG-58C)
Belden 8212 (RG-59)
Belden 8263 (RG-59B)
Belden 9269 (RG-62A)
Belden 83241 (RG-141A)
Belden 8216 (RG-174)
Belden 8267 (RG-213)
Davis RF Bury-Flex
TMS LMR-100A
TMS LMR-200
TMS LMR-240
TMS LMR-400
TMS LMR-600
TMS LMR-900
300 ohm Tubular
450 ohm Window
600 ohm Open
Andrew Heliax LDF4-50A
Andrew Heliax LDF5-50A
Andrew Heliax LDF6-50A
Generic 300 ohm Tubular
Generic 450 ohm Window
Generic 600 ohm Open
CommScope 6 Series Plenum
CommScope 11 Series Plenum
CommScope 59 Series Plenum
CommScope 6 Series Drop
CommScope 11 Series Drop
CommScope QR 320 Drop
CommScope 59 Series Drop
Aircell 5
Aircell 7
Aircom Plus
Ecoflex 10 Standard
Ecoflex 10 Plus
Ecoflex 15 Standard
Ecoflex 15 Plus
Ecoflex 10 Plus HTX
MACX350A 3-1/8" Rigid Line
MACX450A 4-1/16" Rigid Line
MACX650A 6-1/8" Rigid Line
MACX775A 7-3/16" Rigid Line
MACX850A 8-3/16" Rigid Line

## Key features

- Calculate characteristic impedance and velocity factor
- Determine attenuation and electrical length
- Calculate impedance at the other end
- Compute SWR and loss due to SWR
- Calculate net power out
- Supports over 50 transmission line types

## Recent user reviews (8 of 8)

All indexed reviews: https://appshunter.io/ios/app/transmission-line-calc/id302734281/reviews.md

### 5/5 — Handy RF Tool

*2026-02-28*

I use Transmission Line Calc frequently to estimate the insertion loss of an RF cable.  If I can perform a measurement of the cable’s insertion loss with an RF analyzer, having this app gives me confidence that the measurement was good when the calculated loss and the measured loss are within a dB.  The app has a nice selection of coaxial cables to choose.

### 5/5 — David, Technical Support Engineer

*2024-01-09*

I use the LineCalc app more often than any other technical app. I have worked in RF communications for over 40 years and I use this app almost daily. Highly recommended for the RF field engineer and amateur radio (ham) operator.

### 2/5 — Broken on my iPhone X

*2018-04-06*

Have been trying to use app for first time on iPhone X. Cut constantly crashes after parameters are changed. Very painful...

### 5/5 — Great app !

*2016-10-03*

Very handy and useful.

### 4/5 — Make better choices in antenna design

*2014-09-07*

Antenna system designs need the insight provided by this tool along with an antenna analyzer. These two tools have made a great improvement in my antenna building & transmission line selections, since choices are not only from recommendations of others. Antenna tuning is satisfying with the easy results provided by this app.

VE9BP

### 5/5 — Nice to have

*2011-12-19*

Great little app for educating yourself on transmission lines and their effects. Wish it had a larger cable database, or the ability to add your own cable and characteristics.

### 3/5 — Nice app

*2010-07-31*

Would be more useful if we could add our own xmsn line parms or type to the database.  Would be handy to be able to enter power in various forms as well as other misc losses/gains.  Heck why not through a freespace loss calc as well.  One other thing, would be nice to be able to populate all the fields we like without backing out each time with "done"

### 5/5 — Extremely useful app

*2010-04-20*

Does exactly as it says on the tin. 

Could you add RG223 and U67 please as I use these two every day.

## Frequently asked questions about Transmission Line Calc

### What calculations can Transmission Line Calc perform?

Transmission Line Calc can calculate characteristic impedance, velocity factor, attenuation, electrical length, SWR, and net power out for RF transmission lines.

### How many transmission line types does Transmission Line Calc support?

Transmission Line Calc supports over 50 different transmission line types, including various Belden, Davis RF, TMS, and Andrew Heliax cables, as well as generic and rigid lines.

### What information do I need to input into Transmission Line Calc?

You need to specify the transmission line type, its length, and the operating frequency. You can also input impedance and input power for more detailed calculations.

### Is Transmission Line Calc available on Android?

Transmission Line Calc is currently available for iOS devices, including iPhone, iPad, and iPod.

### How often is Transmission Line Calc updated?

The app was last updated on June 5, 2022, with version 2.0 being the latest release.

### What is the price of Transmission Line Calc?

Transmission Line Calc is a paid application, priced at $2.99.

### Does Transmission Line Calc have ads?

No, Transmission Line Calc is ad-free, providing an uninterrupted user experience.

### What is the age rating for Transmission Line Calc?

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

## Version history (last 5 releases)

### 2.0 — 2022-06-05

Updates for new iOS versions.

### 1.4 — 2015-10-23

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

Added data for several sizes of rigid line.
You can enter in cable impedance, velocity factor, and loss values for your own transmission lines.
Updates for iOS 9.

### 1.3 — 2013-12-02

iOS 7 support
Added additional cable types

### 1.2 — 2012-10-30

Added seven additional types of coax cable

### 1.1 — 2010-06-23

iPad support.

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## More apps by Black Cat Systems

- [WireCalc](https://appshunter.io/ios/app/wirecalc/id301047029)
- [RF Link Calc](https://appshunter.io/ios/app/rf-link-calc/id303034300)
- [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

## Related topics

[transmission line calc](https://appshunter.io/ios/topics/transmission-line-calc)

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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 2026-06-10.*