Percentage Calculator

Three percentage tools in one page — percent of, percent of a total, and percent change.

FREE TOOL · WORKS OFFLINE · NO SIGN-UP

1️⃣ What is X% of Y?

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2️⃣ X is what % of Y?

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3️⃣ Percentage Increase / Decrease

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🧮 How to Use This Percentage Calculator

  1. 1.Percent of a number (tool 1). For discounts, tips and taxes: "15% of 240" means 240 × 0.15 = 36. Useful for sale prices and exam marks.
  2. 2.What percent is X of Y (tool 2). For scores and shares: 45 out of 150 is 30%. Divide the part by the whole, then multiply by 100.
  3. 3.Percent change (tool 3). For price rises, salary changes and growth: compare any two values and see the increase or decrease as a percentage of the starting value.
  4. 4.Everything updates instantly. All three tools recalculate as you type — no buttons, no waiting, no sign-up.

❓ FAQ

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 15% of 240 = 240 × 15 ÷ 100 = 36. A shortcut: dividing by 100 first (240 × 0.15) gives the same answer.

How do I calculate percentage increase or decrease?

Subtract the old value from the new value, divide by the old value, then multiply by 100. From 80 to 100: (100 − 80) ÷ 80 × 100 = +25%. A negative result means the value decreased.

What is the difference between percent and percentage points?

A change from 4% to 5% is an increase of 1 percentage point, but a 25% relative increase (because 1 is 25% of 4). News and financial reports often mix these up — this calculator works in relative percent change.

Is this percentage calculator free?

Yes — 100% free, no sign-up, no limits. Everything runs in your browser; none of your numbers are uploaded or saved.