What is the Percentage Calculator?
A percentage is a number out of 100. Our percentage calculator answers the four questions people search most: "what is 15% of 2,500", "850 is what percent of 1,100", "what is the percentage increase from 200 to 250" and "what is 1,000 plus 10%".
Students use it to work out marks percentage, shoppers to check a discount, and employees to see the size of a pay rise. Every box updates as you type, so there is no Calculate button to press.
How to use the Percentage Calculator
- Pick the question that matches your problem: percent of a number, what percent, percentage change, or add/subtract a percentage.
- Type the two numbers into that calculator.
- Read the answer in the highlighted box. Change either number and the answer updates instantly.
Formula
X% of Y = Y × X ÷ 100 · X as a % of Y = X ÷ Y × 100 · % change = (new − old) ÷ old × 100
Example
Marks percentage: 850 out of 1,100 = 850 ÷ 1,100 × 100 = 77.27%.
Salary increase: from Rs 80,000 to Rs 92,000 = (92,000 − 80,000) ÷ 80,000 × 100 = 15% increase.
Percent of a number: 18% of Rs 4,500 = 4,500 × 18 ÷ 100 = Rs 810.
How to calculate percentage by hand
Finding a percentage of a number
Multiply the number by the percentage and divide by 100. To find 25% of 640, work out 640 × 25 ÷ 100 = 160.
Finding what percent one number is of another
Divide the part by the whole and multiply by 100. 45 out of 60 is 45 ÷ 60 × 100 = 75%.
Percentage increase and decrease
Subtract the old value from the new value, divide by the old value and multiply by 100. A negative answer is a decrease.
Percentage points vs percent
If an interest rate moves from 10% to 12%, it rose by 2 percentage points but by 20 percent. Mixing these up is the most common percentage mistake.
Where percentages are used every day
- Exam results and CGPA to percentage conversions
- Shop discounts and sale prices
- Sales tax, GST and VAT
- Bank profit rates, loan interest and inflation
- Salary increments and bonus calculations
Frequently asked questions
How do I calculate the percentage of marks?
Divide your obtained marks by the total marks and multiply by 100. For example, 950 out of 1,100 is 86.36%.
How do I calculate a percentage increase?
Subtract the old value from the new one, divide by the old value and multiply by 100. From 200 to 250 is a 25% increase.
How do I find 20% of a number?
Multiply the number by 20 and divide by 100, or simply multiply by 0.2. 20% of 3,500 is 700.
How do I reverse a percentage to find the original price?
Divide the final amount by (1 + rate ÷ 100). If a price after 18% tax is 1,180, the price before tax was 1,180 ÷ 1.18 = 1,000.
What is the difference between percentage and percentile?
A percentage is a share out of 100. A percentile is a rank: the 90th percentile means you scored higher than 90% of people.
Can a percentage be more than 100?
Yes. If a value more than doubles, the increase is over 100%. Going from 50 to 150 is a 200% increase.
Is the Percentage Calculator free to use?
Yes. The Percentage Calculator on Custom Converter is completely free, with no sign-up, no daily limit and no watermark.
Does the Percentage Calculator work on mobile phones?
Yes. It is built mobile-first and works on Android phones, iPhones, tablets and computers in any modern browser, with no app to install.