Calcolatrice percentuale gratuita online
Four ways to calculate percentages instantly.
What is X% of Y?
X is what % of Y?
Percentage Change
Increase / Decrease by %
How Percentages Work
A percentage is a fraction of 100. The word itself comes from the Latin "per centum," meaning "by the hundred." When you say 25% of 200, you're saying 25 out of every 100, so 25/100 x 200 = 50. Percentages are used everywhere: discounts, tax rates, tips, grades, statistics, financial returns, and data analysis.
This calculator provides four common percentage operations that cover virtually every calculation you might need. All math happens instantly in your browser · no server involved.
Common Uses
- Calculate sale discounts and final prices
- Figure out tips at restaurants
- Determine tax amounts on purchases
- Track investment gains or losses
- Calculate grade percentages for school
- Compare price changes over time
Frequently Asked Questions
What is the formula for percentage of a number?
To find X% of Y: multiply Y by X and divide by 100. Formula: (X / 100) * Y. For example, 15% of 200 = (15 / 100) * 200 = 30.
How do I calculate percentage change?
Percentage change = ((New Value - Old Value) / |Old Value|) * 100. If a stock goes from $50 to $65, that's ((65-50)/50)*100 = 30% increase.
What is the difference between percentage and percentage points?
If an interest rate goes from 5% to 7%, that is a 2 percentage point increase, but a 40% percentage increase (because 2/5 = 0.40). Percentage points describe the absolute difference; percentage describes the relative change.