Percentage Calculator

Calculate percentages quickly and easily with our free online calculator. Perfect for discounts, tax calculations, tips, and more.

Features

• Multiple calculation types:
  • What is X% of Y?
  • X is what percentage of Y?
  • Increase a number by X%
  • Decrease a number by X%
• Real-time calculations
• Clear explanations
• Mobile-friendly interface
• No registration required

How to Use

1. Choose the type of calculation you need
2. Enter your numbers
3. Get instant results with explanations
4. Switch between calculation types as needed

Common Applications

Shopping

• Calculate discounts
• Add sales tax
• Figure out tips
• Compare prices

Finance

• Interest calculations
• Investment returns
• Tax calculations
• Budget planning

Education

• Grade calculations
• Test scores
• Statistical analysis
• Learning percentages

Business

• Profit margins
• Growth rates
• Market share
• Commission calculations

Understanding Percentages

Percentages are everywhere—sales, grades, tips, taxes, statistics. They're just a way of expressing parts of a whole as a fraction of 100. The word "percent" literally means "per hundred," so 50% means 50 out of 100, or half. Simple enough in theory, but calculating percentages can get confusing when you're doing it in your head.

A percentage is basically a fraction with 100 as the denominator. 50% is 50/100, which simplifies to 1/2. 25% is 25/100, or 1/4. 75% is 75/100, or 3/4. Once you see percentages as fractions, they make more sense. Converting between percentages and fractions is just moving decimal points around—50% is 0.50, 25% is 0.25, 10% is 0.10.

The basic percentage calculation is straightforward. To find what X% of Y is, you multiply Y by X and divide by 100. Or easier, convert the percentage to a decimal (move the decimal point two places left) and multiply. So 20% of 150 is 0.20 × 150, which is 30. Finding what percentage X is of Y is the opposite—divide X by Y and multiply by 100. So 30 is what percent of 150? 30 ÷ 150 = 0.20, times 100 is 20%.

Shopping and discounts constantly involve percentages. That shirt on sale for 30% off—what's the final price? If it's $50, 30% off is $15, so you pay $35. Or calculate it directly: 70% of $50 (since you're paying 70% after the 30% discount) is $35. Sales tax is a percentage added on. If your total is $100 and tax is 8%, you add $8. Tips are percentages—15%, 18%, 20% of the bill. Calculating these quickly helps you make informed spending decisions.

Finance uses percentages constantly. Interest rates are percentages. If you're earning 3% interest on $1000, that's $30 per year. Investment returns are percentages. A 10% return on a $5000 investment is $500. Loans have interest rates as percentages. Credit cards charge interest as percentages. Understanding percentage calculations helps you make better financial decisions.

Grades and school work involve percentages. If you got 45 out of 50 questions right on a test, that's 90%. If the test is worth 20% of your grade and you got 90%, you earned 18 points toward your final grade. Weighted grades, course percentages, assignment values—they all involve percentage calculations.

Business uses percentages for profit margins, growth rates, market share, and more. A company's profit margin might be 15%, meaning for every $100 in revenue, they keep $15 as profit. Growth rates show percentage increases. If sales grew from $100,000 to $120,000, that's a 20% increase. Market share percentages show what portion of the market a company controls.

Statistics and data analysis rely heavily on percentages. Polls show results as percentages—60% of people support something. Survey results are percentages. Population statistics use percentages. When you're analyzing data, converting raw numbers to percentages makes them easier to compare and understand.

Percentage change calculations show increases or decreases. To find the percentage increase from an old value to a new value, subtract the old from the new, divide by the old, and multiply by 100. If something went from 100 to 120, that's (120 - 100) ÷ 100 × 100 = 20% increase. Percentage decrease works the same way. If something dropped from 200 to 150, that's (200 - 150) ÷ 200 × 100 = 25% decrease.

Real-world problems constantly involve percentages. Restaurant bills need tips calculated. Paychecks have tax percentages deducted. Sale prices need discount calculations. Test scores need percentage conversions. Budget planning involves percentage allocations. Recipes sometimes need percentage adjustments when scaling up or down.

Percentage points are different from percentages, which can be confusing. If something increases from 10% to 12%, that's a 2 percentage point increase, but it's a 20% increase (2 is 20% of 10). Understanding the difference helps when reading statistics or analyzing data.

Calculating percentages mentally can be tricky, especially with non-round numbers. What's 17% of 243? That's harder than 10% or 20%. Breaking it down helps—10% of 243 is 24.3, 7% would be about 17, so 17% is roughly 41.3. But for accuracy, especially with money or important calculations, using a calculator is better.

This calculator handles all the common percentage calculations. Find what percentage one number is of another. Calculate a percentage of a number. Increase or decrease a number by a percentage. Calculate percentage change between two values. No need to do the math manually or risk making mistakes. Just enter your numbers and get instant, accurate results.

Common Conversions

• 50% = 1/2
• 25% = 1/4
• 75% = 3/4
• 20% = 1/5
• 10% = 1/10

Why Use Our Calculator

• Instant calculations
• Multiple calculation types
• Clear explanations
• User-friendly interface
• Works offline
• Free to use