Percentage Calculator
Free online percentage calculator — find what percent one number is of another, calculate percentage increase or decrease, and solve percentage problems instantly.
What is X% of Y?
% of=
5
X is what % of Y?
is what % of=
30%
Percentage Change
→=
+25%
How to Calculate Percentages
A percentage is a fraction expressed as a value out of 100. The basic formulas are:
X% of Y = (X / 100) × Y
X is what % of Y = (X / Y) × 100
% Change = ((New - Old) / Old) × 100
Common Percentage Questions
- Tips: What is 20% of a $85 bill? Answer: $17
- Discounts: A $40 shirt is on sale for $30 — that's 25% off
- Growth: Sales went from 200 to 250 — a 25% increase
- Grades: You got 42 out of 50 correct — that's 84%