Free online percentage calculator for all your percentage calculation needs.
Calculate percentage of numbers, percentage increase/decrease, and find what percentage one number is of another.
Perfect for students, professionals, and everyday calculations - works instantly with no download required.
Calculate what percentage of a number equals another number
Percentage Of: Calculates X% of a given number
Percentage Change: Finds the % increase/decrease between two values
Find Percentage: Determines what % one number is of another
All calculations update in real-time as you type
Select the type of percentage calculation you need from the three options: Percentage Of, Percentage Change, or Find Percentage
Enter the required values based on your selected calculation type
Choose optional settings like rounding to 2 decimal places or showing calculation breakdown
View your results instantly as you type - no need to click calculate
Use the reset button to clear all fields and start a new calculation
Calculate sale prices after percentage discounts
Calculate percentage change in salary or income
Find what percentage your score is of total marks
Calculate tax amounts based on percentage rates
Track percentage change in weight loss or gain
Students can calculate exam percentages, grade improvements, statistical data analysis, and verify mathematical homework. Essential for mathematics, statistics, and science courses requiring percentage calculations.
Calculate profit margins, price markups, sales tax, commission rates, investment returns, and financial growth metrics. Crucial for business planning, budgeting, and financial analysis.
Calculate discounts during sales, coupon savings, tip amounts, interest calculations, and budget percentages. Helps make informed purchasing decisions and manage personal finances effectively.
Track body fat percentage, weight loss progress, calorie intake percentages, and nutritional data distribution. Useful for fitness goals and health monitoring.
Calculate percentage changes in data sets, survey results, market share analysis, and statistical reporting. Essential for researchers, analysts, and data-driven decision making.
A percentage is a way of expressing a number as a fraction of 100. The word 'percent' literally means 'per hundred,' making it a universal way to compare proportions and ratios. When we say something is 50%, we mean it's 50 out of 100, or half of the whole. This mathematical concept is fundamental in everyday life, from calculating discounts to analyzing statistical data.
The three main types of percentage calculations serve different purposes. 'Percentage Of' helps you find a specific portion of a number - like calculating 20% tax on a purchase. 'Percentage Change' measures growth or decline between two values, essential for tracking progress over time. 'Find Percentage' determines what proportion one number is of another, useful for calculating grades or market share.
Understanding percentages is crucial because they provide a standardized way to compare different quantities. Whether you're calculating a 15% tip at a restaurant, analyzing a 200% stock return, or determining that you've completed 75% of a project, percentages make complex relationships immediately understandable and comparable across different contexts.
Confusing percentage increase with the new total
Remember that a 50% increase means the new value is 150% of the original, not 50%. Always add the percentage change to 100% for the new total value.
Incorrect order in percentage change calculations
For percentage change, always subtract the old value from the new value first, then divide by the original (old) value. Using the wrong order will give you the inverse percentage.
Forgetting to convert decimals to percentages
When your calculator shows 0.25, remember this equals 25%. Multiply decimal results by 100 to get the percentage value, or move the decimal point two places to the right.
Not accounting for compounding in successive percentage changes
When applying multiple percentage changes sequentially (like 10% increase then 10% decrease), you can't simply add them. Calculate each step separately using the new base value each time.
Using wrong base value in calculations
Always identify your base value clearly. In 'Percentage Of' calculations, the base is the number you're taking the percentage of. In percentage change, the base is always the original/starting value.
Our calculator performs three main types: Percentage Of (finds X% of a number), Percentage Change (calculates increase/decrease between two values), and Find Percentage (determines what percentage one number is of another).
Our calculator provides precise results with full decimal accuracy. You can optionally round to 2 decimal places for cleaner results, and the detailed breakdown shows the exact mathematical steps.
Yes, our calculator supports decimal numbers and provides exact results. Whether you're calculating 12.5% of 345.67 or finding percentage change with decimal values, the calculator handles all scenarios accurately.
Yes, completely free! No registration, no ads, and no usage limits. Perform unlimited percentage calculations whenever you need them.
No, all calculations happen in your browser and are not saved or transmitted anywhere. Your privacy is protected, and no calculation history is stored.
Absolutely! The calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers. The interface adapts to your screen size for optimal usability.
For compound changes, calculate each percentage step separately. For example, for a 20% increase followed by a 10% increase, first calculate the 20% increase, then use that result as the base for the 10% increase.
Percentage change measures increase/decrease from an original to new value (directional), while percentage difference measures the relative difference between two values without direction. Our calculator focuses on percentage change for most practical applications.