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SnapCalculations

Percentage Calculator

Solve the three most common percentage problems instantly. Just fill in any row.

What is X% of Y?

What is % of ?
30
Show steps
  1. 1

    Turn the percentage into a decimal

    15 ÷ 100 = 0.15

  2. 2

    Multiply by the number

    0.15 × 200 = 30

X is what percent of Y?

is what % of ?
25%
Show steps
  1. 1

    Divide the part by the whole

    30 ÷ 120 = 0.25

  2. 2

    Multiply by 100 to get a percentage

    0.25 × 100 = 25%

Percentage increase / decrease

From to
+25%
Show steps
  1. 1

    Find the difference

    100 − 80 = 20

  2. 2

    Divide by the starting value

    20 ÷ 80 = 0.25

  3. 3

    Multiply by 100 (positive = increase)

    0.25 × 100 = 25%

How it works

  • X% of Y = X ÷ 100 × Y.
  • A is what % of B = A ÷ B × 100.
  • Percentage change from A to B = (B − A) ÷ |A| × 100.

Worked examples

15% of 200

What is 15% of 200?

  1. Convert the percentage to a decimal: 15 ÷ 100 = 0.15.
  2. Multiply: 0.15 × 200.

Answer: 30

Try this example

A price rising from 80 to 100

What is the percentage increase when a price goes from 80 to 100?

  1. Change = 100 − 80 = 20.
  2. Divide by the starting value: 20 ÷ 80 = 0.25.
  3. Multiply by 100.

Answer: A 25% increase

Try this example

Frequently asked questions

What is the difference between percent and percentage points?

Going from 10% to 15% is a 5 percentage-point increase but a 50% relative increase.

Why can't I calculate change from zero?

A change from 0 is undefined as a percentage because you would be dividing by zero.

Results are estimates for general information and are not financial, medical or professional advice.