What's New

Fix the dark mode issue and improve performance

App Description

Proportions Calculator is a simple tool for calculating proportions. Just enter any three values and the program will find the fourth. Use it for resizing images and videos, finding tip amounts, calculating sales tax, scaling recipes, converting currency, or anything where proportions are used.

Features
* Any value can be the unknown
* Each entry can be cleared individually
* All entries can be cleared at one time

This App calculates proportions (direct or indirect), also known as "rule of three" by entering three known values and hitting "Calculate". The App will calculate the missing value for you!

A history of calculated values is kept and can be managed within the App.

iPhone Screenshots

(click to enlarge)

Ratio Calculator - Proportion screenshot 1 Ratio Calculator - Proportion screenshot 2 Ratio Calculator - Proportion screenshot 3

App Changes

  • July 10, 2020 Initial release
  • October 04, 2023 New version 1.1
  • October 04, 2023 Price increase: $1.99 -> $4.99