How do I calculate what X% of Y is?

Use Mode 1: enter the percentage in the first field and the total in the second field. The result updates automatically.

How do I find what percentage X is of Y?

Use Mode 2: enter both values and the calculator shows what percentage the first number is of the second.

How do I calculate percentage change?

Use Mode 3: enter the original value and the new value. The calculator shows the percentage increase or decrease between them.

Can I calculate the original price before a discount?

Yes — in Mode 1, if you know the discounted amount and the percentage, you can rearrange: the original price equals the discounted amount divided by (1 - discount%). Mode 3 also works for finding the starting value from a final value and a percentage change.

Percentage Calculator

Calculate percentages instantly — three modes for every percentage problem.

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Mode 1 — What is X% of Y?

What is% of?

Mode 2 — X is what % of Y?

is what % of?

Mode 3 — % change from X to Y

Fromto

How to Percentage Calculator

Choose a calculator mode: "What is X% of Y", "X is what % of Y", or "% change from X to Y".
Enter the known values in the input fields.
The result updates instantly — no need to press calculate.
Use the Clear button to reset the fields.

Why Use This Tool?

Percentage calculations come up constantly — in finance, shopping discounts, grades, statistics, and everyday life. This tool gives you three modes to cover every common percentage question: finding a percentage of a number, working out what percentage one number is of another, and calculating the percentage change between two values.