Free Percentage Calculator – Calculate Percentages, Increase, Decrease & More
Percentage Calculator
Calculate percentages quickly and accurately for school, exams, marks, shopping, discounts, business, salary changes, profit and loss, GST helpers, and everyday calculations.
What is X% of Y?
The most common percentage calculation.
A is what percentage of B?
Find what percentage one value represents of another.
Quick Percentage Table
Enter any number to instantly see common percentages.
| Percentage | Amount |
|---|
Percentage Increase
Calculate the increase from an original value to a new value.
Percentage Decrease
Calculate the decrease from an original value to a new value.
Percentage Change
Shows whether a value increased, decreased, or stayed the same.
Percentage Difference
Useful when neither value is treated as the original or baseline.
Percentage Points
Compare two percentages without confusing percentage points with relative percentage change.
Reverse Percentage
Find the original value when the final value and percentage change are known.
Discount Calculator
Calculate discount amount and final sale price.
Original Price from Discounted Price
Reverse a discount correctly instead of simply adding the discount percentage.
Markup Calculator
Calculate markup amount and selling price from cost.
Price Increase
Calculate an increased price after applying a percentage.
Price Decrease
Calculate a reduced price after applying a percentage.
Profit Percentage
Profit percentage is calculated against the cost price.
Loss Percentage
Loss percentage is calculated against the cost price.
Profit Margin
Profit margin uses selling price as the denominator, unlike markup.
Marks Percentage Calculator
Calculate your percentage from marks obtained and maximum marks.
Attendance Percentage
Calculate current attendance and estimate additional classes needed to reach a target.
Multi-Subject Marks Calculator
Add subjects and calculate total marks and overall percentage. Maximum 100 subjects.
| Subject | Marks Obtained | Maximum Marks | Action |
|---|
Target Percentage Calculator
Find how many additional marks are required to reach a target percentage, assuming a fixed total.
Salary Percentage Change
Compare old and new salary. This is a percentage helper, not payroll or tax advice.
Salary After Percentage Change
GST / Tax Percentage Helper
A simple mathematical tax percentage helper. It is not official tax advice.
Fraction to Percentage
Convert a fraction into a percentage.
Percentage to Decimal & Fraction
Convert a percentage into its decimal form and a simplified fraction where practical.
Custom Percentage Calculator
Apply a percentage increase or decrease to any number.
What Is a Percentage?
A percentage is a way of expressing a number as a part of 100. The word percentage means “per hundred”. For example, 25% means 25 parts out of 100, or 25/100.
How to Calculate a Percentage
To calculate a percentage of a number, multiply the number by the percentage and divide by 100.
Percentage of a number = (Percentage ÷ 100) × Number
For example, 20% of 500 is 100 because 20 ÷ 100 × 500 = 100.
Common Percentage Formulas
- Percentage of a number: (Percentage ÷ 100) × Number
- What percentage is A of B: (A ÷ B) × 100
- Percentage increase: ((New − Original) ÷ Original) × 100
- Percentage decrease: ((Original − New) ÷ Original) × 100
- Percentage difference: |A − B| ÷ ((A + B) ÷ 2) × 100
- Profit percentage: Profit ÷ Cost Price × 100
- Loss percentage: Loss ÷ Cost Price × 100
- Profit margin: Profit ÷ Selling Price × 100
How Percentage Increase Works
Percentage increase measures how much a value has increased relative to its original value. For example, if a value changes from 100 to 125, the difference is 25 and the percentage increase is 25%.
How Percentage Decrease Works
Percentage decrease measures how much a value has fallen relative to the original value. For example, if a price falls from 200 to 150, the decrease is 50 and the percentage decrease is 25%.
How to Calculate Discounts
To calculate a discount, multiply the original price by the discount percentage and divide by 100. Subtract the resulting discount amount from the original price to get the sale price.
How to Calculate Marks Percentage
Divide marks obtained by total marks and multiply by 100. For example, 450 marks out of 500 gives a percentage of 90%.
How to Calculate Profit and Loss Percentage
Profit is the difference between selling price and cost price when the selling price is higher. Loss is the difference when the selling price is lower. Profit and loss percentages normally use the cost price as the denominator.
Percentage vs Percentage Points
Percentage points describe the direct difference between two percentages. For example, moving from 20% to 35% is an increase of 15 percentage points. The relative percentage increase is 75%.
