Percentage Calculator
Calculate percentages, percentage increases and decreases, discounts, tips, and more. Professional percentage calculator used by millions of students, teachers, and professionals worldwide.
Basic % Calculator
Common Use Cases
💰 Shopping & Discounts
Calculate sale prices, discounts, and savings on purchases.
📈 Business & Finance
Calculate profit margins, growth rates, and financial metrics.
🎓 Academic & Grades
Calculate test scores, grade percentages, and academic performance.
🍽️ Tips & Service
Calculate restaurant tips, service charges, and gratuities.
Quick Reference
Percentage Formulas
(Part/Whole) × 100(% × Number) ÷ 100((New-Old)/Old) × 100Common Percentages
💡 Pro Tips
- • Use percentage increase for salary negotiations and business growth
- • Calculate discounts before shopping to budget effectively
- • Track percentage changes to monitor progress over time
- • Round percentages for quick mental math approximations
- • Double-check important financial percentage calculations
Understanding Percentages
What is a Percentage?
A percentage is a way of expressing a number as a fraction of 100. The word "percent" comes from the Latin phrase "per centum," meaning "by the hundred." It's denoted by the symbol %.
Real-World Applications
Percentages are used everywhere: sales tax, interest rates, statistical data, academic grades, business metrics, and scientific measurements. They make comparing proportions easy.
Calculation Tips
To convert decimals to percentages, multiply by 100. To find a percentage of a number, multiply the number by the percentage and divide by 100. Practice with real examples.
About Percentage Calculator
Master percentage calculations with our comprehensive calculator supporting all percentage types.
Common Use Cases
Calculate discounts, sale prices, and savings on products and services for shopping decisions.
Analyze investment returns, salary increases, and financial growth percentages over time.
Calculate test scores, grade percentages, and academic performance metrics for students.
Measure revenue growth, profit margins, and business performance indicators.
Calculate sales tax, service fees, tips, and other percentage-based charges.
Analyze survey results, demographic data, and statistical percentages for research.
Calculate body fat percentages, weight loss progress, and fitness improvement metrics.
Calculate commission rates, property value changes, and real estate percentage calculations.
Measure conversion rates, engagement percentages, and marketing effectiveness metrics.
Calculate percentage allocation for budgets, expense ratios, and financial planning.
Examples & Demonstrations
A $200 jacket is 25% off. Calculate: 25% of $200 = $50 discount. Final price: $200 - $50 = $150.
Input:
Shopping Discount Calculation
Output:
A $200 jacket is 25% off. Calculate: 25% of $200 = $50 discount. Final price: $200 - $50 = $150.
Salary increases from $50,000 to $55,000. Percentage increase: (($55,000 - $50,000) / $50,000) × 100 = 10%.
Input:
Salary Increase Analysis
Output:
Salary increases from $50,000 to $55,000. Percentage increase: (($55,000 - $50,000) / $50,000) × 100 = 10%.
Student answers 42 out of 50 questions correctly. Grade percentage: (42 / 50) × 100 = 84%.
Input:
Test Score Calculation
Output:
Student answers 42 out of 50 questions correctly. Grade percentage: (42 / 50) × 100 = 84%.
Investment grows from $1,000 to $1,200. Return percentage: (($1,200 - $1,000) / $1,000) × 100 = 20%.
Input:
Investment Return Analysis
Output:
Investment grows from $1,000 to $1,200. Return percentage: (($1,200 - $1,000) / $1,000) × 100 = 20%.
Tips & Best Practices
Remember that a change from 10% to 15% is a 5 percentage point increase, but a 50% relative increase.
For percentage change: ((New Value - Old Value) / Old Value) × 100. For percentage of: (Part / Whole) × 100.
Round to 2 decimal places for money, 1 decimal for percentages, and consider context for precision needs.
Double-check results by working backwards - if 20% of 50 is 10, then 10/50 should equal 0.2 or 20%.
Multiple percentage changes compound - two 10% increases equal 21% total increase, not 20%.
Percentages make comparing different scales easier - 5% growth is the same relative increase regardless of base size.
Percentage decreases result in negative values - a 25% decrease from 100 gives 75, not -25.
Remember: 0.15 = 15%, 1.5 = 150%. Move decimal point two places when converting.
Related Tools
Frequently Asked Questions
How do I calculate percentage increase?
Use the formula: ((New Value - Old Value) / Old Value) × 100. For example, if a value goes from 80 to 100, the increase is ((100 - 80) / 80) × 100 = 25%.
What's the difference between percentage and percentage points?
Percentage points measure absolute change in percentages. If something goes from 10% to 15%, that's a 5 percentage point increase and a 50% relative increase.
How do I calculate what percentage one number is of another?
Divide the part by the whole and multiply by 100: (Part / Whole) × 100. For example, 25 is what percentage of 200? (25 / 200) × 100 = 12.5%.
Can percentages be greater than 100%?
Yes! Percentages over 100% indicate the value is greater than the reference point. A 150% increase means the new value is 2.5 times the original.
How do I handle multiple percentage changes?
Multiple percentage changes compound. For two 10% increases: first gives 110%, then 110% × 1.10 = 121%, which is a 21% total increase.
Why Choose Percentage Calculator?
Our percentage calculator stands out from other online tools with its precision, speed, and user-friendly interface. Built by engineers for professionals, students, and everyday users, it provides accurate results instantly without requiring any software installation or registration.
With robust error handling, multiple format support, and responsive design, this tool works seamlessly across all devices and browsers. Trust ConvertLarge for all your conversion and calculation needs.