# 555 Calc

> Utilities

Canonical page: [https://chrome-stats.com/d/id868058244](https://chrome-stats.com/d/id868058244)

## Overview

- **ID:** `id868058244`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Jibiki Works
- **Category:** Utilities
- **Rating:** 4.00 / 5 (3 ratings)
- **Version:** 1.7
- **Last updated:** 2026-01-02
- **First published:** 2014-04-29
- **Size:** 18 MB
- **Data as of:** 2026-09-24
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/555-calc/id868058244)
- **Privacy policy:** [https://jibikiworks.com/en/privacy-policy/555-calc-privacy-policy.html](https://jibikiworks.com/en/privacy-policy/555-calc-privacy-policy.html)

## Description

This App calculates registors value, when designing the circuit using Timer IC 555.

How to
(1) Input Frequency value.
(2) Input Duty Ratio.
(3) Input C1 Value.
(4) Touch ‘Calculate’ button.
(5) Registors value will be displayed.

Note.
* Set Duty Ratio to 50 ~ 99.
* If you set Duty Ratio to 50, R1 value will be set to 0.

## Rankings

- #595,722 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id868058244)