How do I find what percent one number is of another?

Choose “Share in %” and enter the part and the whole. For example, 30 of 120 is 25%. The calculator divides the part by the whole and multiplies by 100.

How do I calculate percentage change?

The “Change in %” mode shows how much a value has grown or dropped. Enter the old and new values — growth shows with a plus sign, a decrease with a minus.

Can I enter decimal numbers?

Yes. Use a dot or a comma as the decimal separator — both work.

Is my data saved or sent anywhere?

No. All calculations run right in your browser; nothing is stored or sent to a server.

What's the difference between a percent of a number and a percentage change?

A percent of a number takes a share of one value (20% of 1500). A percentage change compares two values and shows how much one grew or dropped versus the other.

How do I quickly find 10% or 50% of a sum?

10% is the number with the decimal point moved one place left (of 250 → 25); 50% is half. The calculator works out any percent exactly.

Percentage calculator

Percentage calculator online: find a percent of a number, what percent one number is of another, and add or subtract a percent from a sum. No formulas, no separate calculator.

Percent, %

Number

How to use it

1

Pick the calculation type

Percent of a number, the share of one number in another, or a percentage change — switch the mode at the top.

2

Enter two values

For example, to find 15% of 2000, enter 15 and 2000. The fields are labeled for the selected mode.

3

See the result instantly

The answer updates automatically as you type — there's nothing to click.

Why it's useful

Percentages come up every day: store discounts, deposit interest, tips, the share of a plan completed, a price going up or down. Not everyone can do them quickly in their head, and a single misplaced digit changes the result dramatically.

This calculator covers the three most common tasks: find a percent of an amount, work out what share in percent one number is of another, and calculate the percentage change between two values. That handles most everyday and work situations without dredging up school formulas.

FAQ

Choose the “Percent of a number” mode and enter the percent and the number. For example, 20% of 1500 = 300. The formula is simple: multiply the number by the percent and divide by 100.

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