Percentage Calculator
Three calculators in one — find X% of a number, calculate what percentage one value is of another, or work out the percentage change between two numbers.
What is ?% of ??
How percentages work
A percentage is a number expressed as a fraction of 100. The word comes from the Latin per centum — "per hundred." Percentages appear in everyday finance: interest rates, tax rates, discounts, investment returns, and salary changes are all expressed as percentages.
The three most common percentage questions each have a simple formula. This calculator handles all three so you never need to remember which to use.
Examples
X% of Y
15% of $240
$36 result
tip, discount, tax
X is what %
45 out of 180
25% of total
score, share, ratio
% Change
$80,000 → $95,000 salary
+18.75% increase
raise, price change, growth
Frequently asked questions
How do I calculate what percentage one number is of another?
Divide the part by the whole and multiply by 100. For example: 30 is what % of 200? → (30 ÷ 200) × 100 = 15%.
How do I find X% of a number?
Multiply the number by the percentage and divide by 100. For example: 15% of 200 → (15 ÷ 100) × 200 = 30.
How do I calculate percentage change?
Subtract the original value from the new value, divide by the original value, and multiply by 100. Example: from 100 to 150 → ((150 − 100) ÷ 100) × 100 = +50%.
What is the difference between percentage and percentage points?
A percentage point is an absolute difference between two percentages. If interest rates rise from 3% to 5%, that is a 2 percentage point increase — but a 66.7% relative increase. Always check which is meant when reading financial data.
How do I calculate a percentage increase in price?
Use the % change formula: ((new price − old price) ÷ old price) × 100. If a product goes from $80 to $100, the increase is ((100 − 80) ÷ 80) × 100 = 25%.
Disclaimer: For informational purposes only. Results are mathematical calculations based on the values you enter.