Free Percentage Calculator & Percentage Change Tool

Calculate percentages, percentage increase/decrease, what percentage of X is Y, and discounts with 1-click step-by-step mathematical explanations.

🔒 100% In-Browser & Zero Server Uploads

About Percentage Calculator (All-in-One)

Multi-mode percentage calculator for everyday math: 1) What is X% of Y? 2) X is what % of Y? 3) Percentage increase or decrease from X to Y.

How to Use Percentage Calculator (All-in-One) Online

  1. Choose calculation mode from the dropdown.
  2. Enter numbers X and Y.
  3. View the calculated result and mathematical formula explanation.

Frequently Asked Questions

What is the formula to calculate percentage change?
Percentage Change = ((New Value - Old Value) / |Old Value|) × 100.