Math Tool

📊 Percentage Calculator

Solve any percentage problem instantly — find X% of Y, what percent X is of Y, percentage increase or decrease, and add or subtract a percentage.

Percentage (%)

Of value

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Enter values above

Input Values

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Decimal Form

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Fraction Form

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Result
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📋 Percentage Formulas

What is X% of Y?

result = (X ÷ 100) × Y

X is what % of Y?

percentage = (X ÷ Y) × 100

Percentage change from X to Y

change = ((Y − X) ÷ X) × 100

Add X% to Y

result = Y × (1 + X ÷ 100)

Subtract X% from Y

result = Y × (1 − X ÷ 100)

🧠 How to Use This Calculator

Pick the mode that matches your problem — X% of Y, X is what % of Y, percentage change, or add/subtract a percent.
Enter your numbers. The result updates live as you type — no submit button needed.
Use the example chips below the inputs to see how each mode works.
Copy the result with the button below the answer.
Scroll down to see the formula used for your calculation.

Tip: For shopping discounts, use mode 4 (subtract a %) — e.g., "1200 − 25%" gives you the sale price instantly.

❓ Frequently Asked Questions

How do I calculate a percentage?

To find what is X% of Y, multiply Y by X and divide by 100. For example, 15% of 200 = (15 × 200) ÷ 100 = 30.

How do I find what percent one number is of another?

Divide the first number by the second, then multiply by 100. Example: 30 is what percent of 150? (30 ÷ 150) × 100 = 20%.

How do I calculate percentage increase or decrease?

Subtract the original from the new value, divide by the original, then multiply by 100. Example: from 80 to 100 = ((100 − 80) ÷ 80) × 100 = +25%. From 250 to 200 = ((200 − 250) ÷ 250) × 100 = −20%.

How do I add or subtract a percentage from a number?

To add, multiply by (1 + percent ÷ 100). To subtract, multiply by (1 − percent ÷ 100). Example: 200 + 10% = 200 × 1.10 = 220. 500 − 15% = 500 × 0.85 = 425.

What is the difference between percentage change and percentage difference?

Percentage change compares a new value to an original (used for growth or decline). Percentage difference compares two values without a clear original, using their average as the base.

Is my data stored anywhere?

No. All calculations run in your browser. No numbers are sent anywhere. No tracking, no ads.

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