Percentage Calculator
Calculate percentages, shares, and percentage change between two numbers.
What is X% of Y?
X is what percent of Y?
Percentage change from X to Y
How to use
- Use the first calculator to find X% of a value.
- Use the second to find what percent one number is of another.
- Use the third to find the percentage increase or decrease between two values.
Frequently Asked Questions
How is percentage change calculated?
As (New − Old) / |Old| × 100, so a positive result means an increase and a negative result means a decrease.
Can I use negative numbers?
Yes, all three calculators accept negative values where mathematically valid.
What if I divide by zero?
The calculator shows a warning if the base value is zero, since percentage of/from zero is undefined.