Percentage Calculator

How to use the Percentage Calculator

1. Pick a mode: % of a number, what % is X of Y, or % increase/decrease.
2. Enter the two numbers.
3. Read the answer instantly.

Percentage Calculator example

25 is 12.5% of 200. And 20% of 1,500 is 300 — the same two modes the calculator offers.

Who uses the Percentage Calculator?

Students, shoppers, teachers and shopkeepers working out marks, discounts and shares.

About Percentage Calculator

Calculate any percentage instantly — what percent is X of Y, percent of a number, and increase or decrease. Free percentage calculator for marks, no sign-up. Everything runs in your browser, so your data stays private and results appear instantly. No signup and no payment — free to use.

What Is a Percentage?

A percentage is a way of writing a fraction out of 100. The word itself means "per hundred": 25% means 25 out of every 100. Percentages are useful because they let you compare things of different sizes. A student who scores 45 out of 50 and a student who scores 720 out of 800 have both scored 90%, even though their raw marks are very different. That single number — the percentage — makes the comparison fair and instant. Shops, banks, schools, and exam boards all use percentages for the same reason: they turn any two numbers into one number everyone understands.

How to Calculate a Percentage (Step by Step)

Step 1: Pick a mode. Choose "% of a number", "what % is X of Y", or "% increase / decrease" — the mode that matches your question.

Step 2: Enter the two numbers. For "what % is X of Y", enter the part first and the total second. For "% of a number", enter the percentage and then the number. For increase or decrease, enter the old value and the new value.

Step 3: Read the answer instantly. The result appears as soon as you type, with no button to press and no page to reload.

The formulas behind the modes are simple. Percent of a number: (percentage ÷ 100) × number. What percent is X of Y: (X ÷ Y) × 100. Percentage increase: (new value − old value) ÷ old value × 100. You never need to remember them — the calculator applies them for you — but knowing them helps you check that an answer makes sense.

Percentage of Marks — A Guide for Students

The most common use of this tool in Pakistan and India is marks. To find your percentage, divide the marks you obtained by the total marks and multiply by 100. For example, 762 marks out of 1,100 is (762 ÷ 1,100) × 100 = 69.27%. The same method works for any exam: Matric, FSc, a class test, or an entry test. If your result card shows a grade instead of a percentage, this calculation gives you the exact figure behind it.

Students also use the percentage increase mode to track improvement: if you scored 60% in one test and 75% in the next, that is a 25% increase on your earlier score, calculated as (75 − 60) ÷ 60 × 100. And the "percent of a number" mode answers questions like "what is 20% of 1,500?" — the answer is 300 — which is the same calculation a shop uses for a discount.

Who Uses This Tool?

Students use it for exam marks, class tests, and entry-test scores. Teachers use it to convert raw marks into percentages for result cards. Shoppers use it to check a discount before paying — 20% off 1,500 means paying 1,200, not guessing at the counter. Shopkeepers use it to set sale prices and work out profit margins. Anyone comparing two numbers — a salary rise, a price increase, a score improvement — uses percentages, and this tool does the arithmetic.

Benefits of This Calculator

The first benefit is speed: the answer appears as you type, so a marks calculation that takes a minute on paper takes a second here. The second is accuracy: the calculator does not make the classic mistake of dividing by the wrong number. The third is the three modes in one place — you do not need a different tool for a discount and a different one for marks. And it is free, with no sign-up, so you can use it in an exam hall's waiting room, in a shop, or at home, on any phone.

Worked Example

Three questions, three answers. First, what percentage is 25 of 200? Divide 25 by 200 to get 0.125, multiply by 100, and the answer is 12.5%. Second, what is 20% of 1,500? Take 20 ÷ 100 = 0.2, multiply by 1,500, and the answer is 300 — so a 20% discount on 1,500 saves you 300 and leaves 1,200 to pay. Third, what is the percentage increase from 400 to 500? Subtract to get 100, divide by the old value 400 to get 0.25, multiply by 100, and the answer is a 25% increase. Try all three in the calculator above: pick the mode, type the two numbers, and check that your answers match.

Percentage Points Are Not the Same as Percent

One confusion causes more mistakes than any other: percentage points are not the same as a percentage change. If a pass rate rises from 20% to 25%, that is a rise of 5 percentage points — but as a relative change it is a 25% increase, because 5 is a quarter of 20. News reports, exam results and price changes all use both ideas, and mixing them up makes a small change sound huge or a huge change sound small. When someone says a rate 'rose by 5%', check whether they mean 5 percentage points or 5% of the original value — the two answers are very different, and the calculator's increase mode gives you the relative change, while simple subtraction gives you the points.