# iAttenuation — Passive attenuator calculator

> Calculates resistor values for passive attenuator networks in audio and RF applications. (iPhone/iPad app by Black Cat Systems.)

- Source: https://appshunter.io/ios/app/iattenuation/id305626528 (this page in markdown: same URL + `.md`)
- Developer: [Black Cat Systems](https://appshunter.io/developer/301047032)
- Category: Reference, Utilities
- Price: $2.99
- Rating: 3.00/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 15.6 · 1 MB
- Languages: American English
- Released: 2009-02-21
- Data updated: 2026-06-05
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/iattenuation/id305626528/reviews.md

## What is iAttenuation?

Passive attenuators are two port / four terminal resistive networks that are designed to reduce (or attenuate, hence their name) the power between a source and load. They can also match the impedance between the source and load. They are used in a variety of audio and radio / RF applications.

iAttenuation calculates resistor values for the following types of attenuator networks:

Tee Network
Pi Network
H (Balanced Tee)
O (Balanced Pi)
Minimum Loss Pad

Just enter in the input and output impedance values, and the desired attenuation, and iAttenuation does the rest!

iAttenuation can also adjust the calculated resistor values to match the nearest standard 1%, 5%, or 10% tolerance values.

## Key features

- Calculates resistor values for passive attenuator networks
- Supports Tee, Pi, H, O, and Minimum Loss Pad configurations
- Input and output impedance calculation
- Desired attenuation input
- Adjusts resistor values to standard tolerances (1%, 5%, 10%)


## Frequently asked questions about iAttenuation

### What types of attenuator networks does iAttenuation calculate?

iAttenuation calculates resistor values for Tee Network, Pi Network, H (Balanced Tee), O (Balanced Pi), and Minimum Loss Pad configurations.

### What information do I need to provide to use iAttenuation?

You need to input the desired input and output impedance values, and the desired attenuation level for your circuit.

### Can iAttenuation help with component sourcing?

Yes, iAttenuation can adjust the calculated resistor values to match the nearest standard 1%, 5%, or 10% tolerance values, making it easier to find readily available components.

### What devices is iAttenuation available on?

iAttenuation is supported on iPhone, iPad, and iPod devices.

### How often is iAttenuation updated?

The latest version, 4.0, was released on June 25, 2025, indicating active development and updates.

### What is the age rating for iAttenuation?

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

### What is the price of iAttenuation?

iAttenuation is a paid application, priced at $2.99.

### What is the user feedback on iAttenuation?

Based on available data, iAttenuation has a rating of 3.0 stars from 2 ratings, suggesting mixed user reception.

## Version history (last 4 releases)

### 4.0 — 2025-06-25

Changes for new iOS versions/updates.

### 3.0 — 2022-05-30

Updates for new iOS versions.

### 2.0 — 2016-09-19

Added support for the iPad.
Added calculation of nearest 1%, 5%, and 10% resistor values.

### 1.0.0 — 2009-02-21

No release notes.

## Apps similar to iAttenuation

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Base - Base Converter](https://appshunter.io/ios/app/base-base-converter/id1403216682) | — | $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)
- [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

[iattenuation](https://appshunter.io/ios/topics/iattenuation)

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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 2026-06-05.*