Percent calculator

Free Online Percent Calculator — Calculate Percentages, Increases, and Decreases Instantly

Use our free Percent Calculator to quickly find percentage values, percentage increase or decrease, and what percent one number is of another. Whether you’re working with discounts, taxes, or data analysis, this smart calculator makes percentage math simple and accurate.

How to use calculator

1. Enter the numbers in the fields — for example, “What is 25% of 200?”
2. See instant results for each type of calculation.

Types of Percentage Calculations Supported

• What is X% of Y? — instantly find a part of a number.
• X is what percent of Y? — determine percentage relations.
• Percentage increase/decrease — compare old and new values.

Why Use Our Online Calculator?

• ⚡ Instant, automatic calculations without manual math.
• 💻 100% browser-based — no downloads or logins required.
• 📱 Mobile-friendly design for phones, tablets, and desktops.
• 🎯 Ideal for students, finance professionals, and everyday users.

Example Calculations

Example 1: What is 20% of 150? → 30
Example 2: 45 is what percent of 120? → 37.5%
Example 3: Increase from 80 to 100 → +25%
Example 4: Decrease from 200 to 150 → −25%

This free online percentage calculator helps you make fast, reliable calculations for finance, shopping discounts, business analysis, and school math problems. Get accurate results instantly — no need for formulas or spreadsheets.