Percentage Calculator
Find percentages, percentage of a number, and percentage differences instantly.
25% of 100
25.00
📝 Quick Examples
Formulas
X% of Y:
(X / 100) × Y
X is what % of Y:
(X / Y) × 100
Y increased by X%:
Y + (Y × X / 100)
Y decreased by X%:
Y - (Y × X / 100)
Percentage change:
((New - Old) / Old) × 100
💡 Percentage Tips
- • Percentages are always out of 100
- • 50% = 0.5, 25% = 0.25, 100% = 1
- • To increase by X%, multiply by (1 + X/100)
- • To decrease by X%, multiply by (1 - X/100)
- • Negative percentage change means a decrease
How it works
X% of Y = (X / 100) × Y X is what % of Y = (X / Y) × 100 Y increased by X% = Y + (Y × X / 100) Y decreased by X% = Y - (Y × X / 100) Percentage Change = ((New - Old) / Old) × 100 Examples: 20% of 150 = (20 / 100) × 150 = 30 45 is what % of 200 = (45 / 200) × 100 = 22.5% 100 increased by 25% = 100 + (100 × 25 / 100) = 125
The percentage calculator helps you perform common percentage calculations instantly. Choose from five calculation modes: find a percentage of a number, find what percentage one number is of another, calculate increases and decreases, or determine percentage change between two values. Simply enter your numbers and get the answer immediately.
Why this matters
Percentage calculations are essential for everyday math in finance, shopping, school, and business. Whether calculating discounts, tax, tips, growth rates, or exam scores, understanding percentages is crucial. This calculator makes quick work of percentage problems without manual calculation.
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The complete guide to percentage calculator
Formulas, examples, and tips explained in plain English