Percentage Calculator
Calculate percentages with 5 different modes. Fast, accurate, and completely free.
Select Calculation Mode
How do these calculations work?
A% of B: (A / 100) × B. Example: 20% of 100 = 20
A is what % of B: (A / B) × 100. Example: 25 is 50% of 50
A is B% of what: (A × 100) / B. Example: 25 is 50% of 50
% increase: ((B - A) / A) × 100. Example: 50 to 75 = 50% increase
% decrease: ((A - B) / A) × 100. Example: 100 to 75 = 25% decrease
Percentage Calculator FAQs
How do I calculate percentage increase?
To calculate percentage increase: subtract the original value from the new value, divide by the original value, then multiply by 100. Formula: ((New - Old) / Old) × 100. Example: price increased from $50 to $75 = ((75-50)/50) × 100 = 50% increase.
What's the difference between percentage increase and percentage decrease?
Percentage increase calculates how much something grew (new value is larger). Percentage decrease calculates how much something shrank (new value is smaller). Both use the original value as the baseline for calculation.
How do I find what percent one number is of another?
Divide the first number by the second number, then multiply by 100. Formula: (A / B) × 100. Example: "What percent is 25 of 200?" = (25/200) × 100 = 12.5%
Can I calculate percentage of a percentage?
Yes! Use the "A% of B" mode. For example, to find 20% of 50%, enter 20 in field A and 50 in field B. The result is 10% (since 20% of 50% = 0.20 × 50 = 10).