- Section 1 answers 'what is X% of Y' — for example, 15% of 200 is 30.
- Section 2 answers 'X is what % of Y' — for example, 30 is 15% of 200.
- Section 3 gives the percentage change from X to Y, shown as + or − for increase or decrease.
- All results update together with one click, so you can cross-check the same numbers across all three.
Home › Percentage Calculator
Percentage Calculator — Three Calculations in One
The three percentage questions everyone asks, answered in one place: what is X% of Y, X is what percentage of Y, and the percentage change (increase or decrease) between two values. Enter your numbers and press calculate.
1. What is X% of Y?
Result: 30
2. X is what % of Y?
Result: 15%
3. Percentage change from X to Y
Result: +25%
How the percentage calculator works
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100 — or simply multiply by the decimal form: 15% of 200 is 200 × 0.15 = 30.
How do I calculate percentage increase?
Percentage change = (new − old) ÷ old × 100. If a price rises from 80 to 100, that's (100−80)/80 × 100 = +25%.
How do I calculate a discount?
Use section 1: a 20% discount on a $50 product is 20% of 50 = $10 off, so you pay $40.
What is the difference between percent and percentage?
'Percent' means a rate per hundred (with a number: 15 percent), while 'percentage' refers to a portion of a whole in general usage — in practice the terms are used interchangeably.
Estimates are for guidance only and are based on published 2025/2026 rates. Always confirm with a qualified professional for financial decisions.