How do I convert a percentage to a decimal?

Divide by 100. For example, 45% = 0.45. To go the other way, multiply by 100.

What is the difference between percentage points and percent change?

Percentage points measure the absolute difference between two percentages (10% to 12% is +2 points). Percent change measures the relative difference (10% to 12% is a 20% increase).

Percentage Calculator

Calculate percentages, percentage change, and percentage of a number.

Inputs

What do you want to calculate?*

Value A*

The first number (see the question above for what it means).

Value B*

The second number (see the question above for what it means).

Enter your values to see results instantly.

How this works

Formula

percent = (part / whole) × 100

A percentage expresses a number as a fraction of 100. "20%" means 20 out of every 100, or 0.20 in decimal form.

To find a percentage of a number, convert the percent to a decimal (divide by 100) and multiply. For example, 20% of 150 = 0.20 × 150 = 30.

Percentage change compares how much a value grew or shrank relative to its starting point: (new − old) ÷ |old| × 100. A positive result is an increase; a negative is a decrease.

Worked example

What is 20% of 150?

Value A (percent)20

Value B (number)150

ModeWhat is X% of Y?

Result

20% of 150 is 30. Convert 20% to 0.20, then multiply by 150.

Frequently asked questions

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