Percentage Formulas
- X% of Y: Result = X × Y / 100
- X is what % of Y: Result = (X / Y) × 100
- % change from X to Y: Result = ((Y - X) / X) × 100
- Increase X by Y%: Result = X × (1 + Y/100)
- Decrease X by Y%: Result = X × (1 - Y/100)
Frequently Asked Questions
How do I calculate a percentage increase?
Subtract the original from the new value, divide by the original, then multiply by 100. For example: from 80 to 100 = (100-80)/80 × 100 = 25% increase.
What is a percentage point vs percent?
A percentage point is an absolute change in percent values. Going from 10% to 15% is a 5 percentage point increase but a 50% relative increase.