Percentage Calculator

Instantly calculate the percentage of a number, what percentage one number is of another, and percentage increase/decrease.

Runs 100% in your browser — the numbers you enter are never sent to a server.

What is the percentage of a number?

Result
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What percentage is one number of another?

Percentage
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Percentage increase / decrease

Percentage change from an old value to a new value

Change
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Increase/decrease a number by a percentage

New value
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What Is Percentage Calculation Used For?

A percentage (%) expresses the size of each part when a whole is divided into a hundred equal parts, and it's the most commonly used ratio unit in everyday life. The three modes in this tool bring together three different percentage questions you might run into, all on one page: finding a given percentage of a number (what is 15% of 200?), finding what percentage one number is of another (what percentage of 200 is 30?), and calculating the percentage increase/decrease between two values or increasing/decreasing a number by a given percentage. All three modes rely on the same underlying ratio relationship (number, percentage and result); which equation gets solved just depends on which variable is unknown.

When to use it: finding a discounted price or the price before a discount while shopping, working out a tip rate on a bill, comparing VAT-inclusive and VAT-exclusive amounts, calculating what percentage an exam score represents, expressing a monthly/yearly change in sales, visitors or salary as a percentage, or roughly comparing an investment's return or the interest portion of a loan installment — useful in both everyday and business situations.

Tip: a “percentage point” and a “percentage change” are two different concepts that are often confused — when a rate rises from 20% to 25%, that's a 5 percentage point increase, but it also means a ((25−20)/20)×100 = 25% percentage change; clarifying which one is meant prevents misunderstandings. Also remember that applying several discounts or increases in a row (say, 10% off, then another 10% off) doesn't produce the simple sum you might expect; calculate each step separately.

All the numbers you enter are calculated entirely in your browser with JavaScript; no value is ever sent to a server or stored — so you can safely use this tool for salary, price or other private calculations. Results are rounded to two decimal places; this level of precision is enough for everyday use, but for transactions that must be exact to the last cent — such as an accounting entry — we recommend double-checking with an official calculator or software.

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Frequently Asked Questions

To find the percentage of a number, multiply the number by the percentage value and divide by 100: Result = Number × Percentage / 100. For example, 15% of 200 is 200 × 15 / 100 = 30.

Divide the number by the total and multiply by 100: Percentage = (Number / Total) × 100. For example, 30 is (30/200)×100 = 15% of 200.

The percentage change between two values is found with the formula ((New − Old) / Old) × 100; a positive result means an increase, a negative result means a decrease. To increase a number by a given percentage, multiply it by (1 + percentage/100); to decrease it, multiply by (1 − percentage/100).

A percentage point is the absolute difference between two rates; a percentage change is that difference expressed relative to the old value. For example, if an interest rate rises from 20% to 25%, that's a 5 percentage point increase, but a 25% percentage change (the rate itself grew by a quarter). These two concepts are frequently confused in news and reports.

You can find the original price by dividing the discounted price by (1 − discount rate/100). For example, the original price of a product discounted 20% to 80 TL is 80 / (1 − 0.20) = 100 TL.

No. Consecutive discounts are multiplicative, not additive: after a 10% discount, the second 10% discount is applied to the remaining 90%, which comes out to roughly a 19% total discount (1 − 0.90×0.90 = 0.19). To find the real total discount, you need to apply each discount separately, in sequence.

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