Math Lab

Percent Calculator

Numbers & arithmetic

p% of n; n is what % of m; % change a→b.

p% of n

15% of 20030

(15 ÷ 100) × 200 = 30

n is what % of m

30 is what % of 12025%

(30 ÷ 120) × 100 = 25%

% change from a to b

Change from 80 to 100+25%

((b − a) ÷ |a|) × 100 = ((10080) ÷ 80) × 100 = 25%

Net gain

Frequently asked questions

What kinds of percentage problems does this solve?

It handles the three classic forms: what is x percent of y, x is what percent of y, and percentage increase or decrease between two values. For example, 18 percent of 2500 is 450, useful for quick GST checks. Just type the numbers and the answer updates without any submit button.

How do I calculate percentage marks for school or college?

Enter the marks you scored as the first number and the total marks as the second. The tool gives the percentage in one tap. For a board exam with 425 out of 500, the result is 85 percent. You can also reverse it : find what marks you need to score to reach a target percentage.

How do I compute GST or discount in this tool?

For GST, take the base price and find 18 percent of it, then add to the base. For a 999 rupee item with 18 percent GST, you pay 1178.82 rupees. For a discount, find x percent of the MRP and subtract it. A 40 percent discount on 2500 rupees means you save 1000 rupees and pay 1500.

What is the difference between percentage points and percent?

If interest rises from 6 percent to 8 percent, that is a rise of 2 percentage points, or a 33 percent increase. The two phrases mean different things and news headlines often mix them up. Use percentage points when comparing two percentages directly, and percent when comparing the change to the original.

Percentage increase versus percentage of: where do students go wrong?

Finding 20 percent of 500 gives 100. But increasing 500 by 20 percent gives 600, not 100. Many students get tripped up on this in word problems. This calculator has separate modes for each case, so you pick the right operation and avoid that very common slip in exams.

Can I find the original price before discount or tax?

Yes. If a shirt costs 1500 rupees after a 25 percent discount, divide 1500 by 0.75 to get the original 2000 rupees. For GST-inclusive prices, divide by 1.18 to peel off 18 percent. The reverse-percentage mode of this tool does the division for you, which is great for verifying restaurant or invoice bills.