Percentage Calculator
Calculate a percentage of a number, find what percentage one value is of another, or calculate percentage change.
About this percentage calculator
A simple percentage calculator for discounts, tax checks, margins, growth, school marks and everyday calculations.
Three common percentage calculations
Use the calculation selector for “A% of B”, “A is what % of B?”, or percentage change from one value to another. These cover common discount, markup, score, growth and comparison calculations without changing the formula manually.
For financial decisions, keep the original values and units consistent—mixing monthly and yearly figures is a common source of incorrect percentage comparisons.
How to use Percentage Calculator
- Choose the percentage calculation type.
- Enter Value A and Value B as required by the selected calculation.
- Calculate and verify which value is the base/reference before using the percentage.
Frequently asked questions
Is Percentage Calculator free?
Yes. Divya Tools can be used without creating an account.
Does Percentage Calculator work on mobile?
Yes. The interface is responsive and works in current mobile and desktop browsers.
Are the results official?
No. The tool provides a practical calculation or format check. For regulated, tax or legal use, confirm the latest official rules or portal data.
Editorial note: This page was manually reviewed on 16 September 2026 for tool behaviour, examples and limitations.
Three percentage questions that look similar but are not
“What is 18% of ₹10,000?” asks for a part of a base and gives ₹1,800. “₹1,800 is what percent of ₹10,000?” asks for a ratio and gives 18%. “₹10,000 increased to ₹11,800 — what is the percentage increase?” compares the change with the original value and also gives 18%. Using the wrong base is the most common percentage error.
Percentage change formula
Percentage change is (new − old) ÷ old × 100. The old value is the denominator because it is the starting point. If a price drops from ₹1,000 to ₹800, the change is −₹200 and the percentage change is −20%. Returning from ₹800 to ₹1,000 requires a 25% increase, not 20%, because the base is now ₹800.
Business example
If a product costs ₹80,000 and the selling price is ₹1,00,000, the gross markup on cost is 25%. But the gross margin on selling price is 20%. Those are different measures. A generic percentage calculator can do the arithmetic, but accounting decisions depend on which base your business actually uses.
Rounding
Keep extra decimal places during intermediate steps and round only the final result. Repeated rounding can create small differences in tax, interest or allocation calculations.