---
title: "Percentage Calculator — Documentation & FAQ"
description: "How to use Percentage Calculator, plus answers to common questions."
canonical: "https://www.razi.pro/tools/percentage-calculator/docs"
tags: ["percentage calculator", "percent change calculator", "percent of calculator"]
source: "razi.pro"
---

# Percentage Calculator — Documentation & FAQ

Documentation for [Percentage Calculator](https://www.razi.pro/tools/percentage-calculator) — Solve percentage increase, decrease, and ratio problems in seconds.

## Quick start

Enter values to calculate percentage increase/decrease, or find what percent one number is of another.

## Frequently asked questions

### How do I calculate percentage increase?

Enter the original value and the new value, and the tool will calculate the percentage increase or decrease. For example, going from 50 to 75 is a 50% increase.

### How do I find what percentage one number is of another?

Enter the part and the whole. For example, to find what percentage 25 is of 200: enter 25 as the part and 200 as the total. The answer is 12.5%.