Percentage Calculator
Calculate percentages instantly with our free online percentage calculator. Perfect for percent increase, percent decrease, discounts, tips, grades, and finance calculations. Get accurate results in seconds.
Common Percentage Calculator Examples
20% of 100
Basic percentage
100 + 10%
Increase
100 - 10%
Decrease
80 → 100
Difference
Percentage Calculator Formulas & How to Calculate Percentages
| Calculation Type | Formula | Example |
|---|---|---|
| Basic Percentage | (Percentage × Whole) ÷ 100 | 20% of 100 = (20 × 100) ÷ 100 = 20 |
| Percentage Increase | Original + (Original × Percentage ÷ 100) | 100 + 10% = 100 + (100 × 10 ÷ 100) = 110 |
| Percentage Decrease | Original - (Original × Percentage ÷ 100) | 100 - 10% = 100 - (100 × 10 ÷ 100) = 90 |
| Percentage Difference | |New - Original| ÷ Original × 100 | 80 → 100 = |100 - 80| ÷ 80 × 100 = 25% |
Real-World Percentage Calculator Applications
Discount Calculator & Sales
Calculate sale prices and discounts during shopping. Use our percentage calculator to find how much you save. For example, a $50 item with 20% off would be $40.
Tip Calculator & Gratuity
Calculate tips for services using our percentage calculator. A 15% tip on a $60 bill would be $9, making the total $69.
Finance & Investment Calculator
Track investment growth and calculate percentage returns. A $1,000 investment growing 7% annually becomes $1,070 after one year.
Weight Loss
Track fitness progress. Losing 10% of body weight from 200 lbs means losing 20 lbs.
Scientific Data
Analyze experimental results. A chemical reaction efficiency improving from 75% to 90% is a 20% increase.
Grade Calculator & Test Scores
Calculate grades and test score percentages. Scoring 45 out of 50 on a test is 90%. Perfect for students and teachers.
Frequently Asked Questions - Percentage Calculator
How do I use this free percentage calculator?
Our online percentage calculator helps you find the percentage of a number, calculate percentage increase or decrease, and determine what percentage one number is of another. Simply enter your values and get instant results.
Can I calculate percentage increase and percentage decrease?
Yes. Our percentage calculator can determine both percentage increase and percentage decrease between two values. Perfect for calculating finance growth, discounts, price changes, and statistical analysis.
How do I calculate what percentage one number is of another?
Use the basic percentage calculator tab. Enter the part and the whole values, and our calculator will instantly compute the percentage that the part represents of the whole. Great for grades, statistics, and data analysis.
Is this percentage calculator free for students and professionals?
Absolutely. It’s helpful for quick percentage calculations in academics, business, finance, and everyday math problems.
Why Use Our Free Online Percentage Calculator?
Instant & Accurate Results
Get precise percentage calculations instantly. Our calculator handles basic percentages, percentage increase, percentage decrease, and percentage difference with 100% accuracy.
Multiple Calculation Types
Calculate percentages for any scenario - discounts, tips, grades, finance growth, weight loss, and statistical analysis. Perfect for students, professionals, and everyday use.
Free & No Registration
Completely free percentage calculator with no sign-up required. Access all features instantly from any device - desktop, tablet, or mobile phone.
Easy to Use Interface
Simple, intuitive design makes percentage calculations effortless. Just enter your numbers and get results immediately. Perfect for quick calculations on the go.