Percentage Calculator.

Use the first mode, what is X percent of Y, to work out the GST amount, then add it to your base price. Suppose you sell an item for 2,500 rupees before tax and it attracts 18 percent GST. Enter 18 in the percentage box and 2500 in the number box, and the tool returns 450, which is the GST amount. Your final price including tax is therefore 2,950 rupees. For an item at 5 percent GST priced at 1,000 rupees, enter 5 and 1000 to get 50 rupees of tax and a final price of 1,050 rupees. This works for every GST slab in India, whether 5, 12, 18 or 28 percent, because you simply change the percentage you enter. If you want the calculator to split the figure into CGST and SGST or to remove GST from a tax-inclusive price, our dedicated GST calculator does that automatically, but for a quick add-on this mode is the fastest way.

Use the third mode, percentage increase or decrease, with last period figure as the original value and this period figure as the new value. Say your shop did 80,000 rupees of sales in May and 1,00,000 rupees in June. Enter 80000 as the original and 100000 as the new value, and the tool reports a 25 percent increase. If sales fell instead, from 1,00,000 to 90,000, you would enter those two numbers and see a 10 percent decrease, shown with a clear label so you never misread the direction. The same method works for orders, footfall, followers or any number you track over time. The key is order: always put the earlier value first and the later value second, otherwise the percentage and the direction will be wrong. Tracking month on month growth this way gives you an honest figure to share with your team or a lender, rather than a rough guess about whether business is up or down.

The three modes answer three different everyday questions, and picking the right one matters. The first mode, X percent of Y, finds a portion of a number, which is what you want for tax, tips, commissions and discounts, for example 18 percent of 2,500. The second mode, X is what percent of Y, works backwards to find a share, which is what you want when you know two amounts and need the proportion, for example what percent 45 orders are of 360 total orders, giving 12.5 percent. The third mode, percentage increase or decrease, compares two values over time or across options to measure change, for example how much a price rose from 800 to 1,000 rupees, giving a 25 percent increase. A simple way to choose: if you have a percentage and want an amount, use the first; if you have two amounts and want a percentage share, use the second; if you have a before and an after and want the change, use the third. The labels above the input boxes update to match each mode so you always know which number goes where.

No, nothing you type is stored or sent anywhere. Every calculation runs entirely inside your own browser using a small piece of JavaScript on the page, so your figures never travel to our servers or to any third party. That means you can safely enter sensitive numbers, such as your actual sales, costs or margins, without worrying that they are being logged or shared. Because there is no account and no saved history, the tool simply forgets your numbers the moment you change them or close the tab, which keeps it fast and private. If you want to keep a result, copy it or note it down before you navigate away, since nothing is preserved between visits. This local-only design also means the calculator works even if your connection drops after the page has loaded, because all the maths happens on your device rather than over the network.

You can do this two ways with the percentage calculator. To find the rupee value of a discount, use the first mode: if a product costs 1,500 rupees and you are offering 20 percent off, enter 20 and 1500 to get 300 rupees, so the customer pays 1,200 rupees. To find what discount percentage a price drop represents, use the third mode: enter the original price as the first value and the reduced price as the second, for example 1,500 and 1,200, and the tool shows a 20 percent decrease. Both approaches are useful, the first when you set the discount and want the saving, the second when you see a final price and want to know how deep the discount is. If you regularly run sales, our dedicated discount calculator shows the final price, the amount saved and a reverse mode in one place, but for a quick check either of these modes gets you the answer in seconds.

Yes, with a little care about what you are measuring. There are two common figures: markup and margin, and they are not the same. Markup is profit as a percentage of cost, while margin is profit as a percentage of selling price. To find markup, use the third mode with cost as the original value and selling price as the new value, for example 800 cost and 1,000 selling price gives a 25 percent markup. To find margin, use the second mode: first work out your profit, here 200 rupees, then enter 200 as the part and 1,000, the selling price, as the total, which gives a 20 percent margin. Both numbers are useful, but lenders and accountants usually mean margin when they ask, so be clear which one you are quoting. Mixing them up is a common mistake that makes a business look more or less profitable than it really is, so decide whether you are measuring against cost or against price before you start.

Many real percentages do not land on whole numbers, and that is perfectly normal. If 45 orders out of 360 came through one channel, the exact share is 12.5 percent, and if it were 47 out of 360 it would be about 13.06 percent. The calculator keeps two decimal places so your figure stays accurate, which matters when you are working with money or reporting growth, because rounding too early can quietly distort a total. For everyday communication you can round the displayed figure to a whole number, saying roughly 13 percent rather than 13.06, but for invoices, margins and anything that adds up across many lines it is safer to keep the decimals until the final step. The numbers are also formatted in the Indian style, with commas placed for lakhs and crores, so large values are easy to read at a glance. If you ever see a long string of decimals, it simply reflects that the underlying division does not come out evenly, not an error in the tool.