Percentage Calculator

Six everyday percentage calculations in one place: percentage of a number, what percent one number is of another, percentage change, increase or decrease, and more.

Residual Calculator

Residual Percentage

Amount Financed

How this works: This tool covers six everyday percentage jobs. Residual shows the leftover (balloon) value of an asset at the end of a lease term. What is X% of Y? finds a portion of a number (e.g. 20% of 150 = 30) — handy for tips, deposits and commissions. X is what % of Y? tells you what proportion one number is of another (e.g. 15 is 25% of 60) — useful for scores, savings rates and progress. % Change measures the change from a starting value to a new one and tells you if it’s an increase or decrease. Increase / Decrease adds or subtracts a percentage from a value (e.g. a 10% raise or a 20% discount). % Difference compares two values relative to their average, when neither is the “starting point.” Pick the tab that matches your question, enter the numbers, and press Calculate.

Everyday percentage calculations

Percentages come up constantly — tips, discounts, deposits, tax, test scores, price rises and savings rates. This calculator bundles the six most common percentage jobs so you can pick the one that matches your question and get the answer instantly.

Choose a tab, enter your numbers, and the result appears immediately. No formula-hunting or mental arithmetic required.

The formula

The core relationships: X% of Y = (X ÷ 100) × Y; X is what percent of Y = (X ÷ Y) × 100; percentage change = ((new − old) ÷ old) × 100.

Worked example

Item	Value
20% of 150	30
15 is what % of 60	25%
Change from 80 to 100	+25%
Increase 200 by 10%	220

Frequently asked questions

How do I calculate a percentage of a number?

Divide the percentage by 100 and multiply by the number. For example, 20% of 150 is 0.20 × 150 = 30.

How do I work out percentage change?

Subtract the old value from the new value, divide by the old value, and multiply by 100. A rise from 80 to 100 is a 25% increase.

What is the difference between percentage change and percentage difference?

Percentage change compares a new value to a starting value. Percentage difference compares two values relative to their average, when neither is the clear starting point.