Percentage Calculator
Find X% of Y, compute percentage change, calculate discounts, markup and margin — five powerful modes in one tool.
Markup and Margin Are Not the Same Thing — and Confusing Them Costs Money
A shopkeeper buys something for ₹400 and sells it for ₹600. The profit is ₹200. Now here is where people go wrong: the markup is 50% (profit over cost), but the margin is only 33.3% (profit over selling price). Both numbers describe the same transaction — but they measure different things. If you are quoting "50% margins" to an investor when you actually have 50% markup, you are overstating profitability by a significant amount. The Markup/Margin mode in this percentage calculator shows both numbers side by side so you always know which one you are working with.
This tool covers five distinct percentage calculations in one place — no switching between different pages or remembering which formula goes where. Enter your numbers once, get your answer immediately, see the formula that produced it. Works for shopping, salary, taxes, exam scores, business pricing, and investment returns.
Why a 50% Drop Does Not Cancel a 50% Rise
This is one of the most misunderstood properties of percentages, and it shows up everywhere — in stock markets, salary negotiations, and sale pricing. Start with ₹1,000. A 50% increase gives ₹1,500. Then a 50% decrease on ₹1,500 gives ₹750 — not ₹1,000. The two operations are not inverses at the same percentage rate because each one is applied to a different base. To recover from a 50% loss, you need a 100% gain, not another 50%.
Use the % Change mode to figure out the exact recovery percentage after any loss. Enter the original value as Old and the current depressed value as New — the tool tells you the percentage drop. Then flip the inputs to see what percentage gain brings you back. It also colour-codes increases in green and decreases in red, making direction immediately obvious without reading the sign of the number.
GST, Salary Hikes, and Everyday Calculations Indians Actually Use
The X% of Y mode handles the calculations that come up constantly in daily life. GST at 18% on a ₹5,000 invoice: enter 18 and 5000, result is ₹900 tax and ₹5,900 total. Your salary is ₹45,000 and you got a 12% hike: enter 12 and 45000, result is ₹5,400 — new salary ₹50,400. You scored 67 out of 80 in an exam: switch to What % is X of Y, enter 67 and 80, result is 83.75%.
The Discount mode is built for shopping comparisons. Enter the original price and the discount percentage — you instantly see both the amount saved and the final price you pay. The slider makes it easy to compare different discount rates on the same product without retyping. For deeper analysis of trends or averages across datasets, pair this tool with the Mean, Median & Mode Calculator. For compound growth calculations, the Scientific Calculator handles eˣ and power functions.
Percentage Points vs Percentage Change — a Distinction That Matters
These two phrases are used interchangeably in casual conversation, but they mean completely different things in data reporting. If a loan interest rate rises from 8% to 12%, that is a 4 percentage point increase — but a 50% change in the rate itself. Newspapers routinely confuse these, leading to headlines that dramatically over- or understate what actually happened.
The % Change mode in this calculator measures relative change — the percentage by which one value differs from another. Percentage point change is just arithmetic subtraction between two percentage figures, which you can do directly. Knowing which one a statistic is reporting is the key to not being misled by numbers that are technically correct but contextually misleading. All calculations run entirely in your browser — nothing is sent to any server.
✓Verified by ToollyX Team · Last updated June 2026