Percentage Calculator
Calculate X% of Y, find what percent X is of Y, or compute percent increase/decrease.
Percentage Calculator
What is X% of Y?
What percent is X of Y?
Percent increase/decrease
How to use the percentage calculator
Our free Percentage Calculator makes everyday percent maths fast and reliable. Use the three simple tools above to:
- Calculate X% of Y — find what a percentage of a number equals (e.g. 15% of 200 = 30).
- Find what percent X is of Y — determine how big a part is compared to a whole (e.g. 50 is 25% of 200).
- Measure percent increase/decrease — compare old and new values to see relative change.
Real-world examples
Here are common scenarios where this calculator is useful:
- Shopping & discounts: Work out sale prices quickly.
- Personal finance: Calculate savings growth or budget percentages.
- School & homework: Check percentage-based problems instantly.
- Business: Measure profitability, margin changes, and KPI differences.
Examples with steps
X% of Y: 12% of 250 = (12 / 100) × 250 = 30.
What percent is X of Y: 45 is what percent of 90? → (45 / 90) × 100 = 50%.
Percent change: Going from 80 to 100 is a 25% increase.
Common questions (FAQ)
Can this calculator handle decimals?
Yes. You can use decimals in all input fields, and the tool will format results clearly. Comma or period decimal separators are accepted.
Do I need an account?
No. The calculator works instantly without login or saving any data. Local storage is used only to remember inputs on your device if you allow it.
Does it work on mobile?
Yes — the interface is responsive and touch-friendly. Inputs and buttons are sized for comfortable tapping.