# 555 Timing Circuit Calculator

> 555 Timing Circuit Calculator (iPhone/iPad app by Margaret Brown.)

- Source: https://appshunter.io/ios/app/555-timing-circuit-calculator/id1665208630 (this page in markdown: same URL + `.md`)
- Developer: [Margaret Brown](https://appshunter.io/developer/1665208632)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 11.0 · 15 MB
- Languages: English, Chinese
- Released: 2023-01-19
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/555-timing-circuit-calculator/id1665208630/reviews.md

## What is 555 Timing Circuit Calculator?

The 555 timer is a commonly used integrated circuit that can be configured to generate a square wave output. In the astable configuration, the output is a free running square wave output. In monostable mode, the output is a single high pulse generated for a single input event.
This app can quickly calculate the duty cycle (%), high level time (s), low level time (s), frequency (Hz) by inputting parameters such as R1 (ohm), R2 (ohm), C (F) )


## Version history (last 1 release)

### 1.0 — 2023-01-19

No release notes.

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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 2026-05-19.*