How do I calculate what percentage X is of Y?

Divide X by Y and multiply by 100. For example, 25 is 50% of 50 because 25 / 50 × 100 = 50.

How do I calculate percentage change?

Percentage change = ((new value - old value) / old value) × 100. A positive result is an increase and a negative result is a decrease.

What is reverse percentage?

Reverse percentage finds the original value before a percentage was applied. For example, if a price is $80 after a 20% discount, the original price was $100.

Can I calculate tip with this tool?

Yes. Use the percentage of a value calculator to find the tip amount, or use the dedicated Tip Calculator tool.

📊 Free Online Tool

Percentage Calculator

Instantly calculate any percentage — find X% of Y, percentage change, reverse %, discount, markup, tip and more.

🔢X% of Y

❓What %?

📈% Change

What is X% of Y?

e.g. What is 25% of 200?

Quick %

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25%

50%

75%

Percentage (%)

Number

Result

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X is what % of Y?

e.g. 50 is what % of 200? → 25%

Number (X)

Total (Y)

Result

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Percentage Change

Calculate increase or decrease between two values.

Original Value

New Value

Change

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