About the Percentage Calculator
Percentages come up everywhere: marks, discounts, salary hikes and price changes. This calculator handles the three most common percentage questions instantly.
How to use the Percentage Calculator
- Pick the question you want to answer.
- Type your two numbers.
- Read the answer instantly.
- Use % change for marks, prices or salary growth.
Formula used
X% of Y = X × Y ÷ 100. X as a % of Y = X ÷ Y × 100. % change = (new − old) ÷ old × 100.
Frequently asked questions
How do I calculate marks percentage?
Divide marks obtained by total marks and multiply by 100. For example, 450 out of 500 is 90%.
How do I calculate a percentage increase?
Subtract the old value from the new value, divide by the old value and multiply by 100.
What is 20% of 500?
20 × 500 ÷ 100 = 100.
Last reviewed: November 7, 2026