Work out a percentage of a number, what percent one number is of another, the percentage change between two values, a value increased or decreased by a percentage, the whole from a part, and the percentage difference between two numbers.
What does this tool do?
Solves the three everyday percentage problems: what is X% of Y, what percentage X is of Y, and percentage increase/decrease between two numbers. Type any two values and the answer appears instantly — no formula memorising.
Because the math runs locally, the Percentage Calculator works offline after the page loads and never queues behind a server — handy during load-shedding or on slow mobile data. There is nothing to install and no account to create; the page is the whole application, ready in the time it takes to open a tab.
How do I use this tool?
Enter your figures below — every result updates the instant you type, so comparing scenarios is just a matter of changing a number and watching the answer move.
- Open the tool — it loads ready to use, no setup needed.
- Follow the on-screen controls; results update live.
- Copy or download the result when you are happy.
How does it work?
Three formulas cover everything: X% of Y = (X/100) × Y; X as % of Y = (X/Y) × 100; percentage change = ((new − old)/old) × 100. The tool detects which values you entered and applies the matching formula, showing the result with the working.
Precision is full floating-point throughout; only the displayed result is rounded for readability. Intermediate steps are not rounded, which avoids the small compounding errors you get from rounding mid-calculation on a phone calculator.
Use cases in Pakistan
Percentages run Pakistani commerce: shop discounts (“20% off”), BISE marks percentages, GST added to bills, salary increments, and profit margins for karyana stores. Students convert CGPA-adjacent marks to percentages for foreign university applications; everyone else checks whether a sale price is honest.
Families use it for household budgeting and school-fee planning; small businesses for pricing and payroll math; students for everything from BISE numericals to CSS preparation. Wherever the same calculation is repeated monthly — bills, salaries, savings targets — this page replaces the phone-calculator ritual.
Limitations
The tool computes the arithmetic you ask for — it cannot tell you which percentage question to ask (e.g. margin vs markup give different answers from the same numbers). For money, it does not round to paisa conventions; and percentage points vs percent change are different things the tool will not disambiguate for you.
Assumptions are stated on the page — read them before trusting the headline number for money, health or legal decisions. A calculator amplifies the quality of its inputs: careful numbers in, trustworthy numbers out.
Frequently asked questions
How do I calculate X% of a number?
Divide X by 100 and multiply by the number — e.g. 15% of 200 = 0.15 × 200 = 30. The tool does this instantly above. For figures that go into applications or documents, double-check the inputs against the source — the math is exact, but only for the numbers you enter.
What is the difference between percent and percentage points?
A rise from 10% to 15% is 5 percentage points, but a 50% increase. Mixing them up is the most common percentage mistake. Try varying one input at a time to see which assumption drives the result; that sensitivity check is often more valuable than the headline number.
How do I find percentage increase?
Subtract the old value from the new, divide by the old value, multiply by 100. Enter both numbers above for the instant answer. Save or screenshot the result with its inputs when the figure matters later — reconstructing “what did I enter?” is harder than it sounds.
Why do sale discounts sometimes look wrong?
Shops may discount the already-taxed price or stack percentages multiplicatively (20% then 10% is 28% off, not 30%). Compute from the pre-tax price to check. For figures that go into applications or documents, double-check the inputs against the source — the math is exact, but only for the numbers you enter.
Is my data uploaded or stored?
No. This tool runs entirely in your browser — what you type or paste never leaves your device, is never sent to a server, and is never stored. Closing the tab removes all trace. Try varying one input at a time to see which assumption drives the result; that sensitivity check is often more valuable than the headline number.
Is it really free? Do I need an account?
Yes, free, and no account needed. Open the page and use it — no sign-up, no trial, no watermark on results. Save or screenshot the result with its inputs when the figure matters later — reconstructing “what did I enter?” is harder than it sounds.
Updated October 2026 · Built and tested by Sharjeel Tahir · How our tools are tested