# Rule of 3 - Direct & Inverse

> Quick proportion calculator

Canonical page: [https://chrome-stats.com/d/id6801684563](https://chrome-stats.com/d/id6801684563)

## Overview

- **ID:** `id6801684563`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** LUIS ANGEL RODRIGUEZ MARCOS
- **Category:** Utilities
- **Version:** 1.1
- **Last updated:** 2026-09-11
- **First published:** 2026-08-24
- **Size:** 351 KB
- **Data as of:** 2026-09-23
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/rule-of-3-direct-inverse/id6801684563)
- **Privacy policy:** [https://inventronics.com.mx/politica-de-privacidad-regla-de-3/](https://inventronics.com.mx/politica-de-privacidad-regla-de-3/)

## Description

Type three values and the empty box solves itself. Direct and inverse rule of three. Free, no ads, works offline.

Rule of 3 - Direct & Inverse: solve any proportion in seconds.

Type three values and the empty box is calculated automatically. No formulas to remember.

HOW IT WORKS
- Direct rule of three: the more, the more. If 3 items cost $45, how much do 7 cost?
- Inverse rule of three: the more, the less. If 4 workers take 6 hours, how long do 8 take?
- The result updates instantly as you type
- Your numbers are saved automatically: take a call, come back, everything is still there

SIMPLE ON PURPOSE
- Works completely offline
- No accounts, no ads, no data collection
- Free

Perfect for shopping, cooking, work and school: scaling recipes, converting units, calculating prices, percentages and much more.

## Rankings

- #1,838,205 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6801684563)