Calculate percentages instantly — find % of any number, calculate percentage increase or decrease, reverse percentage, and much more. No signup, no ads blocking results.
Example: What is 20% of 500?
Example: 45 is what % of 180?
Find % change between two values
Find original value before % change
Add or subtract a % from any number
Calculate percentage from marks obtained
Percentage is one of the most used mathematical concepts in daily life. Whether you're calculating discounts at a shop, checking your exam marks, finding profit or loss in business, or analyzing data at work — percentage calculations come up constantly. Our free percentage calculator handles all of these calculations instantly so you don't need to do mental math or remember formulas.
The word "percent" comes from the Latin "per centum" meaning "per hundred." A percentage is simply a way to express a number as a fraction of 100. So when we say 25%, it means 25 out of every 100 parts. Percentages make it easy to compare different quantities on a common scale.
In mathematics, a percentage is denoted by the symbol %. For example, 45% means 45/100 = 0.45 in decimal form.
This simple formula is the foundation of all percentage calculations. If you know any two of the three values (percentage, part, or whole), you can always find the third one.
This is the most common percentage calculation. To find what X percent of Y is:
Example: What is 30% of 500? → (30 ÷ 100) × 500 = 0.30 × 500 = 150
This type of calculation is extremely useful for calculating discounts. If a product costs Rs. 2,000 and there is a 20% discount, you save Rs. 400 (20% of 2,000) and pay Rs. 1,600.
Percentage increase tells you how much something has grown relative to its original value. This is used in business for profit calculation, in finance for investment returns, and in studies for comparing test scores.
Example: If your salary was Rs. 30,000 and it increased to Rs. 36,000, the percentage increase = ((36,000 – 30,000) ÷ 30,000) × 100 = (6,000 ÷ 30,000) × 100 = 20% increase.
Percentage decrease works the same way but applies when a value goes down. Common uses include price drops, weight loss tracking, or measuring cost reductions.
Example: A product was priced at Rs. 5,000 but now costs Rs. 4,000. Decrease = ((5,000 – 4,000) ÷ 5,000) × 100 = 20% decrease.
Sometimes you know the final price after a percentage increase or decrease, and you want to find out what the original price was. This is called reverse percentage or back percentage calculation.
Example: A product now costs Rs. 1,200 after a 20% increase. What was the original price? → 1,200 ÷ (1 + 20/100) = 1,200 ÷ 1.2 = Rs. 1,000.
Students often need to find their percentage score from total marks. The formula is straightforward and our calculator handles it automatically:
Example: You scored 450 out of 600 marks. Percentage = (450 ÷ 600) × 100 = 75%. This is particularly useful for calculating matric results, FSc results, university GPA conversions, and competitive exam scores.
Here are some everyday percentage problems our calculator can solve in seconds:
While our calculator gives instant results, it helps to know some mental math tricks for quick estimates:
Our free online percentage calculator saves time when you need accurate results fast. Bookmark this page so you always have it handy for exams, shopping, business calculations, or any daily math task.