# BasicATTCalc

> BasicATTCalc (iPhone/iPad app by TAKAHIKO FUKUYAMA.)

- Source: https://appshunter.io/ios/app/basicattcalc/id947238679 (this page in markdown: same URL + `.md`)
- Developer: [TAKAHIKO FUKUYAMA](https://appshunter.io/developer/857468511)
- Category: Productivity
- Price: $1.99
- Age rating: 4+
- Requires: iOS 14.5 · 7 MB
- Languages: American English
- Released: 2014-12-19
- Data updated: 2025-12-20
- User reviews in markdown: https://appshunter.io/ios/app/basicattcalc/id947238679/reviews.md

## What is BasicATTCalc?

Basic Attenuator Calculator (BasicATTCalc) helps you calculate various resistive attenuators which are used in many audio, video and RF circuit design applications.
The standard resistance values based on E-series numbers are outputted in inputting necessary conditions such as source impedance, load impedance and attenuation.

Features
The calculable attenuators and impedance converters are as follows:
- Type T
- Type Pi (π)
- Type H
- Type O
- Type Bridged T
- Type Bridged H
- Type L (Impedance converter)
- Type U (Impedance converter)

Calculated resistance values are displayed with ideal values or the following E-series number specified either.
E12, E24, E48, E96, E192

The most suitable values are calculated in selecting priority calculation whether Simple or Precision.
- Simple:
Perform calculations that the nearest values are derived to desired impedances and attenuation by the simple structure
- Precision:
Perform calculations that the nearest values are derived to desired impedances and attenuation by consisting of up to 4 resistors per an element

In addition to resistance values, this application provides you with input impedance, output impedance and calculated attenuation with mismatch loss.

If necessary, it is able to calculate power dissipated by each resistor and parameters such as reflection coefficient, VSWR, return loss and mismatch loss.

Attention
Because the standard resistors are used, the following restriction is set up.
- Range of resistance value: 1Ω ~ 10MΩ (except ideal values)


## Version history (last 5 releases)

### 2.3.0 — 2024-01-12

Fix an issue that text fields, labels and clear buttons are not displayed correctly because of operating system updates.
Fix an issue that the priority setting does not hold its previous state.

### 2.2.0 — 2023-02-04

Support for all screen sizes of iPhone/iPad/iPod touch.
Fix an issue that a specific resistance value is not displayed correctly in Type Bridged T and Type Bridged H.

### 2.1.0 — 2019-10-04

Support for all display sizes of iPhone/iPod touch.
Add support for iPad and adjust the UI size to the number of pixel.
Fix a issue that part of power calculation is not displayed correctly in Type Bridged T and Type Bridged H.

### 2.0.0 — 2016-07-22

Support for calculation up to 4 resistors because of accuracy improvement.
Change selection name of priority calculation to Simple/Precision.
Change to unified user interface design for Type Bridged T and Type Bridged H.
Fix a issue that parts of texts are not displayed properly on iOS9.

### 1.0.0 — 2014-12-18

No release notes.

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## More apps by TAKAHIKO FUKUYAMA

- [RCircuitCalc](https://appshunter.io/ios/app/rcircuitcalc/id857468508)
- [CCircuitCalc](https://appshunter.io/ios/app/ccircuitcalc/id1435462075)

All apps by TAKAHIKO FUKUYAMA: https://appshunter.io/developer/857468511

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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 2025-12-20.*