About CalcPercentages
A small, independent site that does one thing: percentage arithmetic, quickly and without getting in your way.
What this site is
CalcPercentages is an independent project, not a company. It exists because most percentage calculators online bury a simple tool under pop-ups, forced sign-ups and three screens of scrolling before the input fields appear.
The design goal is that the calculator is usable within a second of the page loading, on a phone, on a slow connection. Everything else on the page — the explanations, the reference tables, the worked examples — sits below the tool, where it helps if you want it and stays out of the way if you do not.
How it works
The site is a static, pre-rendered application. Every page is plain HTML delivered from a CDN, with the interactive calculator taking over once the JavaScript loads. There is no backend and no database.
Calculations happen entirely on your device. Nothing you type is sent anywhere, logged, or stored.
Accuracy
The formulas used are documented openly on each page so you can check the arithmetic yourself. If you find a result that looks wrong, please report it — see the contact page.
Related tools
The same approach is applied to two sibling calculators: a matrix calculator at matrixcalc.net and a working-days calculator at calcworkdays.com.