What is X% of Y?
X is what percent of Y?
Percentage Increase / Decrease
Percentage Difference
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. Example: 25% of 80 = (80 × 25) ÷ 100 = 20.
What is the formula for percentage increase?
((New Value - Original Value) ÷ Original Value) × 100. Example: $50 to $75 = ((75-50)÷50)×100 = 50% increase.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100. Example: 25 is what % of 200? (25÷200)×100 = 12.5%.
How do I calculate a 15% tip?
Multiply the bill by 0.15. For $50: $50 × 0.15 = $7.50. Quick: find 10% ($5) + half ($2.50) = $7.50.
Can percentages be greater than 100%?
Yes! Over 100% means greater than the whole. 150% increase means new value is 2.5× the original.
How do I convert a fraction to a percentage?
Divide numerator by denominator, multiply by 100. Example: 3/4 = 0.75 × 100 = 75%.
What is percentage difference vs percentage change?
Change measures from an original value. Difference compares two values using their average as reference.
How do I convert a percentage to a decimal?
Divide by 100 or move decimal two places left. Example: 75% = 0.75.
What is a percentage point?
Absolute difference between percentages. 5% to 7% = 2 percentage points, but 40% relative increase.
How do I calculate compound percentage change?
Multiply the factors. 10% increase then 10% decrease: 1.10 × 0.90 = 0.99 (1% overall decrease).