How do you calculate percentage increase?

Subtract the original value from the new value, divide by the original value, and multiply by 100: [ (New - Old) / Old ] × 100.

How do you find what percentage X is of Y?

Divide X by Y and multiply by 100: (X / Y) × 100.

Percentage Calculator

Perform common percentage calculations: find P% of a value, determine what percent X is of Y, calculate percentage growth/decay, and add or subtract percentages.

1. What is P% of X?

What is% of?

Answer: 12

Calculation: (15 / 100) × 80 = 12.00

2. X is what percent of Y?

is what % of?

Answer: 25.00%

Calculation: (18 / 72) × 100 = 25.00%

3. Percentage Increase / Decrease

Fromto

Answer: +50.00% (Increase)

Absolute change: +25 | Formula: [(75 - 50) ÷ |50|] × 100

4. Add or Subtract P%

±%

+ 10%: 132.00- 10%: 108.00

Calculation: 120 + 12.00 = 132.00

How to Calculate Percentages

A percentage represents a fraction or ratio expressed with a denominator of 100. The word stems from the Latin per centum, meaning “by the hundred.”

Common Percentage Formulas

Find P% of X: (P ÷ 100) × X
Find what percent X is of Y: (X ÷ Y) × 100
Percentage Increase / Decrease: ((New Value − Old Value) ÷ |Old Value|) × 100

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