Percentage Calculator

Solve any percentage problem instantly percentage of a number, change, increase, decrease, and more.

What is X% of Y?

% of = —

X is what % of Y?

is — % of

Percentage change from X to Y

From to = —

Increase / Decrease Y by X%

% = —

X out of Y as a percentage

out of = —

About This Tool

This calculator solves the most common percentage problems in one click: finding what percent one number is of another, calculating a percentage of a number, computing percentage increase or decrease, and working backwards from a percentage to find the original value. All calculations run instantly in your browser using standard arithmetic formulas no page reload required.

How to Use

  1. Choose the type of calculation you need from the tabs — "% of number", "what % is X of Y", "% change", etc.
  2. Fill in the known values in the input fields.
  3. The result calculates automatically as you type.
  4. Click Copy to copy the result to your clipboard.

Frequently Asked Questions

How do I calculate a percentage increase?

Percentage increase = ((New Value − Old Value) / Old Value) × 100. For example, a price rising from $80 to $100 is a 25% increase: (100 − 80) / 80 × 100 = 25%.

What is X% of Y?

Multiply: X/100 × Y. For example, 15% of 200 = 0.15 × 200 = 30. Use the "% of number" tab to calculate this instantly with any values.

How do I find what percentage X is of Y?

Divide and multiply: (X / Y) × 100. For example, 45 is what percent of 180? (45 / 180) × 100 = 25%. Use the "what % is X of Y" tab.