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Percentage Calculator

Calculate percentages, increase and decrease, marks percentage, discounts, and profit or loss — free, accurate, and easy to use.

Start calculating How it works

Calculator

Choose a calculation type, enter your numbers, then calculate. Each result shows the formula used.

Results use precise decimal arithmetic. Double-check figures for exams, invoices, or financial decisions.

Money examples use PKR (Pakistan).

Example amount: Rs 5,000.00

What is X% of Y?

Find a percentage of a number.

%
Example: 20
Example: 500

How to use this percentage calculator

Pick the calculation that matches your question. Enter the numbers, press Calculate, and review both the result and the formula. This page covers everyday percentage math used in exams, shopping discounts, and simple business checks.

Common formulas

X% of Y = X × Y ÷ 100

X is what % of Y = X ÷ Y × 100

Percentage increase = (New − Old) ÷ Old × 100

Marks % = Obtained ÷ Total × 100

What is a percentage?

A percentage expresses a number as parts per hundred. It is a clear way to compare sizes, scores, discounts, and changes without relying on raw totals alone.

Percentage increase and decrease

Increase and decrease answers always use the original value as the base. That is different from percentage difference, which uses the average of two values and is useful when neither number is the “starting” point.

Marks, discounts, and profit or loss

Students often need obtained ÷ total × 100 for exam scores. Shoppers use discount amount and final price. Sellers use cost and selling price to see profit or loss percentage.

Frequently asked questions

How do I calculate a percentage of a number?

Multiply the percentage by the number, then divide by 100. For example, 20% of 500 is 20 × 500 ÷ 100 = 100.

How do I find what percentage one number is of another?

Divide the part by the whole, then multiply by 100. For example, 100 is 100 ÷ 500 × 100 = 20% of 500.

What is the difference between percentage increase and percentage difference?

Percentage increase compares a new value with an old baseline. Percentage difference compares two values using their average as the base, so neither value is treated as the original.

How is marks percentage calculated?

Divide obtained marks by total marks and multiply by 100. For example, 425 ÷ 500 × 100 = 85%.

How does the discount calculator work?

Discount amount equals original price × discount% ÷ 100. Final price equals original price minus discount amount.

How is profit or loss percentage calculated?

Subtract cost price from selling price to get profit or loss, then divide that amount by cost price and multiply by 100.

Can I enter decimal values?

Yes. All modes accept decimal numbers. Results use precise arithmetic and clear rounding for display.