🔢 Percentage Calculator

About Percentage Calculator

Our comprehensive percentage calculator helps you solve various percentage problems quickly and easily. Whether you're calculating discounts, tips, grade scores, or financial percentages, we've got you covered.

Calculators Available

• What is X% of Y: Calculate a percentage of any number (e.g., 15% of 200 = 30)
• X is what % of Y: Find what percentage one number represents of another (e.g., 50 is 25% of 200)
• Percentage Increase: Calculate the percentage growth between two values (e.g., 100 to 150 = 50% increase)
• Percentage Decrease: Calculate the percentage reduction between two values (e.g., 150 to 100 = 33.33% decrease)
• Add Percentage: Add a percentage to a number (e.g., 100 + 20% = 120)
• Subtract Percentage: Subtract a percentage from a number (e.g., 100 - 20% = 80)

Common Use Cases

• Shopping: Calculate discounts and sale prices.
• Tipping: Determine appropriate tip amounts at restaurants.
• Finance: Calculate interest rates, returns on investment, and loan payments.
• Education: Convert test scores and grades to percentages.
• Business: Calculate profit margins, growth rates, and commission.
• Health: Track weight loss/gain percentages and body composition changes.

How Percentages Work

A percentage is a way to express a number as a fraction of 100. The word "percent" means "per hundred." For example, 50% means 50 per 100, or 50/100, which equals 0.5 or one half.

Percentage Formulas

• Basic: (Percentage / 100) × Number = Result
• Find Percentage: (Part / Whole) × 100 = Percentage
• Percentage Change: ((New - Old) / Old) × 100 = % Change

Tips for Using Percentages

• To convert a decimal to a percentage, multiply by 100 (0.75 = 75%)
• To convert a percentage to a decimal, divide by 100 (75% = 0.75)
• Remember: finding 20% of a number is the same as multiplying by 0.20
• A 50% increase means the final value is 150% of the original (not 50%)