% Percentage Calculator
Three percentage tools in one: find what percent of a number is, calculate percentage change between two values, or determine what percentage one number is of another.
What is X% of Y?
Percentage Formulas
Worked Examples
Example 1 — % of Number
What is 15% of 200?
Example 2 — % Change
Price went from $80 to $100. What is the increase?
Example 3 — X is what % of Y
25 is what percent of 200?
Frequently Asked Questions
Divide the percentage by 100 and multiply by the number. For example, 20% of 150 = (20/100) × 150 = 30.
Percentage change measures the relative difference between an old and new value. Use it when comparing prices, statistics, or any value that has changed over time. The formula is ((New − Old) / |Old|) × 100.
Yes. If a value doubles, that's a 100% increase. If it triples, that's a 200% increase. There is no upper limit on percentage increase, though a decrease can never exceed −100%.
To find the original value before a percentage was added, divide by (1 + rate/100). For example, if $120 is after a 20% increase, the original is 120 / 1.20 = $100.
Percentage points express the arithmetic difference between two percentages. If interest rises from 2% to 5%, that is a 3 percentage point increase, but a 150% relative increase. The distinction matters in finance and statistics.
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