Percentage Calculator
Calculate percentages, percentage changes, and find what percentage one number is of another. Perfect for financial calculations, statistics, and data analysis.
Basic Percentage Calculator
Percentage Calculator Features
Basic Calculations
Find percentage of any number
Percentage Change
Calculate increases and decreases
Part of Total
Find what percentage part is of total
Financial Analysis
Perfect for profit/loss calculations
Statistics
Calculate percentages for data analysis
Precise Results
Accurate calculations with decimal precision
How to Use Our Percentage Calculator
Step-by-Step Guide
- 1Enter your original value or starting amount
- 2Enter the percentage you want to calculate
- 3Choose calculation type (percentage of, percentage change, etc.)
- 4Get instant results with detailed breakdown
Calculation Types
- Percentage of: What is X% of Y?
- Percentage Change: How much did it change?
- Reverse Percentage: What was the original?
- Compound: Multiple percentage changes
- Percentage Points: Absolute difference
When to Use Our Percentage Calculator
Financial Planning
Calculate interest rates, investment returns, loan payments, and financial growth percentages.
Business Analysis
Analyze sales growth, profit margins, market share changes, and business performance metrics.
Academic & Research
Calculate statistical percentages, survey results, test scores, and research data analysis.
Shopping & Discounts
Calculate sale prices, discount amounts, tax percentages, and price comparisons.
Health & Fitness
Track weight loss/gain percentages, body fat changes, fitness progress, and health metrics.
Data Analysis
Analyze data trends, calculate growth rates, compare values, and interpret statistical changes.
Frequently Asked Questions
How do I calculate percentage increase or decrease?
Enter the original value and the new value in our calculator. It will automatically compute the percentage change, showing whether it's an increase (positive percentage) or decrease (negative percentage). For example, if a price goes from $100 to $120, that's a 20% increase. If it drops from $100 to $80, that's a 20% decrease. The formula is: ((New Value - Original Value) / Original Value) × 100. This calculation is essential for analyzing price changes, salary adjustments, sales growth, stock performance, and population changes.
What is the difference between percentage and percentage points?
Percentage is a relative measure expressing a proportion out of 100 (e.g., 10% of 100 = 10), while percentage points measure the absolute difference between two percentages (e.g., from 15% to 20% = 5 percentage points, NOT a 5% increase). This distinction is crucial in finance and statistics. For example, if interest rates rise from 3% to 5%, that's a 2 percentage point increase, but a 66.7% relative increase. Confusing these can lead to misunderstanding data. Use percentage points when comparing two percentage values directly.
Can I calculate compound percentage changes?
Yes! Our calculator can handle multiple percentage changes in sequence, giving you the final result after all changes are applied. Compound changes don't simply add up—if you have a 10% increase followed by a 10% decrease, you don't end up at the original value (you get 99% of the original). For example, $100 increased by 10% = $110, then decreased by 10% = $99 (not $100). This principle is critical for investment returns, inflation calculations, and sequential discounts. Each change applies to the new value, not the original.
Is the percentage calculator free to use?
Absolutely! Our percentage calculator is completely free to use with no registration, hidden fees, or premium features required. You can make unlimited calculations, compare different scenarios, and use all calculation types without any restrictions. The tool works entirely in your browser with no data stored or transmitted. Use it for business calculations, homework, shopping discounts, financial planning, tip calculations, or any percentage-related math as many times as you need.
What types of percentage calculations are supported?
We support comprehensive percentage calculations: 1) Percentage of a number (What is 25% of 200?), 2) Percentage change/increase/decrease (from 50 to 75 = 50% increase), 3) Reverse percentage (45 is 30% of what number?), 4) Percentage difference between two numbers, 5) Compound percentage changes (sequential increases/decreases), 6) Find what percentage one number is of another (25 is what % of 100?). These cover virtually all common percentage calculations for business, finance, education, and everyday use.
How accurate are the percentage calculations?
Our calculator provides high-precision results with up to 10 decimal places for maximum accuracy in financial, scientific, and statistical calculations. It uses JavaScript's native number handling, which follows IEEE 754 double-precision floating-point format. For most practical purposes (business, finance, education), the accuracy is more than sufficient. Results are typically accurate to 15-17 significant digits. For accounting or when exact precision is critical, round results to your required number of decimal places (e.g., 2 decimals for currency).
What are common real-world uses for percentage calculations?
Percentage calculations are used daily in countless scenarios: calculating sales tax and discounts while shopping, determining tip amounts at restaurants, analyzing investment returns and portfolio performance, computing salary increases and pay raises, understanding loan interest and mortgage payments, tracking sales growth and business metrics, comparing price changes and inflation rates, calculating test scores and grades, analyzing survey results and statistics, determining commission payments, and evaluating success rates. Mastering percentage math improves financial literacy and decision-making across all areas of life.
How do I calculate a percentage of a number?
To find a percentage of a number, multiply the number by the percentage and divide by 100. For example, 25% of 200 = (25 × 200) ÷ 100 = 50. Or use the decimal equivalent: convert the percentage to decimal (25% = 0.25) and multiply (200 × 0.25 = 50). Our calculator handles this instantly—just enter the percentage and the number. This calculation is useful for finding discounts (30% off $50), calculating tips (15% of a $80 bill), determining sales tax (7% of purchase price), or computing commission (5% of sales).
What is reverse percentage calculation?
Reverse percentage finds the original value when you know the final value and the percentage change. For example, if $75 represents 150% of the original price (50% increase), the original was $50. The formula is: Original Value = Final Value ÷ (1 + Percentage Change ÷ 100). This is useful for finding pre-discount prices, calculating original salaries before raises, determining base prices before tax, or finding initial investment amounts before returns. It's essentially working backwards from the result to find the starting point.
Does the calculator store my calculation data?
No! All percentage calculations happen entirely in your browser using JavaScript. Your numbers, values, and calculation results are never sent to or stored on our servers. Your financial data, business metrics, personal calculations, and sensitive information remain completely private on your device. The calculator works offline once loaded and doesn't require an internet connection for calculations. Even your browser history doesn't store the values you enter. This ensures complete privacy for all your percentage calculations, whether personal or professional.
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