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📊 Percentage Calculator

Calculate percentages, increases, and decreases

What is X% of Y?

What is % of ?
Answer: 30

X is what % of Y?

is what % of ?
Answer: 20%

Percentage Change

From to
Change: +25%

Increase/Decrease by %

%
Result: 125

Common Percentage Formulas

X% of Y

(Y × X) ÷ 100

X is what % of Y

(X ÷ Y) × 100

% Change

((New - Old) ÷ Old) × 100

Increase by X%

Y × (1 + X/100)

Frequently Asked Questions

How do I calculate percentage of a number?

To find the percentage of a number, multiply the number by the percentage and divide by 100.

Example: 20% of 150 = (150 × 20) ÷ 100 = 30

How do I calculate percentage increase?

Formula: ((New Value - Original Value) ÷ Original Value) × 100

Example: Going from 80 to 100:
((100 - 80) ÷ 80) × 100 = 25% increase

How do I calculate percentage decrease?

Formula: ((Original Value - New Value) ÷ Original Value) × 100

Example: Going from 100 to 75:
((100 - 75) ÷ 100) × 100 = 25% decrease

How do I convert a fraction to a percentage?

Divide the numerator by the denominator and multiply by 100.

Example: 3/4 = (3 ÷ 4) × 100 = 75%

How do I convert a decimal to a percentage?

Multiply the decimal by 100.

Examples:

  • 0.25 = 25%
  • 0.5 = 50%
  • 1.5 = 150%