How do I calculate percentage increase?

Percentage increase = ((New Value - Old Value) ÷ Old Value) × 100. For example, if a price goes from $50 to $65, the percentage increase is ((65-50) ÷ 50) × 100 = 30%.

How do I calculate percentage decrease?

Percentage decrease = ((Old Value - New Value) ÷ Old Value) × 100. For example, if a price drops from $80 to $60, the percentage decrease is ((80-60) ÷ 80) × 100 = 25%.

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

To find what percentage A is of B, use the formula: (A ÷ B) × 100. For example, 25 is what percent of 200? (25 ÷ 200) × 100 = 12.5%.

Can I use this for discount calculations?

Yes! You can calculate sale prices, discounts, tips, tax amounts and any other percentage-based calculation quickly and easily.

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Q: How do I calculate percentage of a number?

To find X% of a number, multiply the number by X and divide by 100. For example, 20% of 150 = (150 × 20) ÷ 100 = 30. Our calculator does this instantly for you.

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Quick Reference

10%1/100.10

20%1/50.20

25%1/40.25

33.3%1/30.333

50%1/20.50

66.7%2/30.667

75%3/40.75

100%1/11.00

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Frequently Asked Questions

How do I calculate percentage of a number?

To find X% of Y, multiply Y by X and divide by 100. For example, 25% of 200 = (200 × 25) / 100 = 50.

How do I calculate percentage change?

Percentage change = ((New - Old) / Old) × 100. For example, from 80 to 100: ((100-80)/80) × 100 = 25% increase.

What is percentage difference?

Percentage difference = (|A - B| / ((A + B) / 2)) × 100. It measures the relative difference between two values compared to their average.

How to increase a number by percentage?

To increase a number by X%, multiply it by (1 + X/100). For example, 200 increased by 15% = 200 × 1.15 = 230.

Is my data stored?

No! All calculations run in your browser. Nothing is sent to any server. Calculation history is stored only in your current session and is cleared when you close the page.