Percentage Calculator
Calculate percentages, increase or decrease values by a percentage. Perfect for calculating discounts, tips, tax, or any percentage-based calculations. All processing happens locally in your browser.
Choose a Calculator
Select a percentage calculation mode
Find Percentage
Work out a percentage of a number, such as 15% of 2,400
Increase by %
Increase a value by a certain percentage
Decrease by %
Decrease a value by a certain percentage
% Difference
Calculate the percentage change between two values
How to use the percentage calculators
Four calculators, each answering one kind of percentage question.
- 01
Match your question to a calculator
Find gives a percentage of a number. Increase and Decrease add or take off a percentage. Change compares an old and a new value. The table below shows which question each one answers.
- 02
Enter your numbers
Results update as you type and each calculator shows the formula it used, so you can check the logic or copy it into a spreadsheet.
Which calculator answers your question
Most percentage confusion comes from using the right numbers in the wrong formula. Start from the question you're actually asking:
| Your question | Use | Formula | Answer |
|---|---|---|---|
| What is 15% of ₹2,400? | Find Percentage | 2,400 × 15 ÷ 100 | ₹360 |
| What's ₹2,400 after a 15% rise? | Increase by % | 2,400 × 1.15 | ₹2,760 |
| What's ₹2,400 after 15% off? | Decrease by % | 2,400 × 0.85 | ₹2,040 |
| ₹2,400 became ₹2,760. By what percent? | Percentage Change | (2,760 − 2,400) ÷ 2,400 × 100 | +15% |
| What percent of 60 is 45? | Any calculator; just divide | 45 ÷ 60 × 100 | 75% |
The last row has no calculator of its own because it's a single division: part ÷ whole × 100. A phone calculator does it in seconds, and it's the formula behind exam scores (510 out of 600 is 85%) and survey results.
Percent, percentage points and the reverse trap
If an interest rate rises from 4% to 5%, that's a rise of one percentage point but a 25% increase in the rate itself. News reports mix these up often, and the difference matters: a loan rate going from 8% to 9% adds a point but raises the interest you pay by 12.5%.
Percentage changes also don't reverse symmetrically. A price that goes up 20% and then down 20% ends lower than it started: 100 becomes 120, then 96. To undo a 20% rise you need a 16.67% fall, because the fall is measured from the bigger number. The Increase and Decrease pages each have a full table of these pairs.
Mistakes worth avoiding
Adding percentages that apply one after another is the most common. Two 10% rises make 21%, not 20%, and 30% off followed by an extra 20% off is 44% off, not 50%. Multiply the factors instead: 1.10 × 1.10 = 1.21.
Averaging percentages is the second. If one shop's sales rose 50% from ₹10,000 and another's fell 10% from ₹1,00,000, the average of the two percentages is +20%, but total sales actually fell from ₹1,10,000 to ₹1,05,000, a 4.5% drop. Work out percentages from totals, not from other percentages.
Reading percentages in news and reports
Headlines often give the relative change because it sounds bigger. Say a study finds a risk goes from 2 in 1,000 people to 3 in 1,000. That's a 50% increase in relative terms, and it's true. But in absolute terms the risk rose by 0.1 percentage points, from 0.2% to 0.3%. Both numbers matter, and a fair report gives both.
Check the base, too. "Sales up 200%" from a tiny starting figure can mean very little in money terms, while a 2% rise on a huge one can be worth more. Whenever you see a percentage, ask "percent of what?" and look for the actual numbers behind it.