Question 1

How do I calculate a percentage?

Accepted Answer

To find X% of a number Y, divide X by 100 and multiply by Y. For example, 15% of 200 = (15 / 100) × 200 = 30. This is the most common percentage formula and is used for discounts, tips, taxes, and more.

Question 2

What is percentage change?

Accepted Answer

Percentage change measures how much a value has increased or decreased relative to its original amount. The formula is ((New Value − Old Value) / Old Value) × 100. For example, if a price goes from $80 to $100, the percentage change is ((100 − 80) / 80) × 100 = 25% increase.

Question 3

Is there a limit on numbers?

Accepted Answer

No, you can use any number including decimals and negative numbers. The calculator handles all valid numeric inputs and formats results up to 6 decimal places, stripping trailing zeros for cleaner output.

Percentage Calculator

What is X% of Y?

X is what % of Y?

Percentage Change from X to Y

X + Y% = ?

X − Y% = ?

Frequently Asked Questions

Related Tools & Resources