# Timer IC 555 Calculator

> Calculation of astable and monostable circuit

Canonical page: [https://chrome-stats.com/d/com.peterhohsy.timer555calculator](https://chrome-stats.com/d/com.peterhohsy.timer555calculator)

## Overview

- **ID:** `com.peterhohsy.timer555calculator`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Peter Ho
- **Category:** TOOLS
- **Downloads:** 270,060
- **Rating:** 4.54 / 5 (2,389 ratings)
- **Version:** 4.0.30
- **Last updated:** 2026-09-03
- **First published:** 2013-12-26
- **Publisher country:** HK
- **Size:** 8.45 MB
- **Data as of:** 2026-09-14
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.peterhohsy.timer555calculator)
- **Privacy policy:** [http://peterho386.weebly.com/uploads/6/7/6/9/6769822/private\_policy\_general.htm](http://peterho386.weebly.com/uploads/6/7/6/9/6769822/private_policy_general.htm)

## Description

Timer IC 555 Calculator is a powerful Chrome extension designed for electronics hobbyists and engineers to efficiently calculate circuits based on the popular IC 555 timer. It supports both monostable and astable circuit calculations, providing accurate frequency and component value computations.

Key features include the ability to compute values for monostable circuits, determine the frequency of astable circuits, and generate component values which can be saved in CSV format for easy documentation or sharing. The PRO version unlocks additional benefits such as selecting preferred resistor and capacitor values, unlimited usage without ads, and sharing CSV files with other applications. For user support, direct email contact is recommended rather than feedback comments.

## Rankings

- #137,289 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.INTERNET`
- `com.android.vending.BILLING`
- `com.android.vending.CHECK_LICENSE`
- `com.peterhohsy.timer555calculator.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`

## Review summary

Users broadly praise the Timer IC 555 Calculator as a very useful, easy-to-use tool that helps with quick timing calculations. It’s described as handy and reliable, with many reviewers calling it excellent or better than similar apps. A few caveats include requests for direct component-value outputs and occasional ad-related delays, but overall the app is well-regarded for its usefulness and informative details.

### Pros

- Very useful tool that explains the necessary details.
- Easy to use and quick for timing/circuit calculations.
- Very handy; users report they use it often.
- Excellent effort and generally better than similar apps.
- Overall well-regarded as a useful and informative calculator.

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.peterhohsy.timer555calculator)