Free online calculator
Percentage Calculator
Solve six common percentage calculations instantly, including increases, decreases, markups, and discounts.
Calculate your result
Six percentage calculations
- X% of Y: (X ÷ 100) × Y
- X as a percentage of Y: (X ÷ Y) × 100
- Increase from X to Y: ((Y − X) ÷ |X|) × 100
- Decrease from X to Y: ((X − Y) ÷ |X|) × 100
- Add X% to Y: Y × (1 + X ÷ 100)
- Subtract X% from Y: Y × (1 − X ÷ 100)
Worked example
20% of 150 is 30: 20 ÷ 100 × 150 = 30. Increasing 150 to 180 is a 20% increase; adding 20% to 150 also gives 180.
Frequently asked questions
How do I find X% of Y?
Divide X by 100, then multiply by Y.
Why can the denominator not be zero?
Ratios and changes divide by the whole or starting value. Division by zero is undefined.
Can I use decimals or percentages above 100?
Yes. All modes accept decimals, percentages above 100, and meaningful negative values.
What does a negative increase or decrease mean?
The values moved in the opposite direction from the selected mode.