Percentage Calculator

CalculateQuick Percentage Calculator brings the most‑used percentage tools into a single, lightweight Chrome extension. • Five calculators – Percentage of a number – What percentage one number is of another – Percentage change between two values – Increase / decrease a value by a percentage – Find the original number from a known percentage • Real‑time results as you type • One‑click copy to clipboard • Keyboard‑friendly input flow • Clear, accessible interface optimised for a 400 px popup • No data collection, no external requests, no ads Ideal for finance, sales, grading, discounts, and everyday maths.