Percentage Calculator

Use our free Percentage Calculator to solve all your percentage-based math problems. Whether you're calculating a tip, figuring out a discount, determining percentage increase or decrease, or comparing values in everyday life, this tool makes percentage calculations quick, simple, and accurate.

What is a Percentage?

A percentage is a way of expressing a number as a fraction of 100. The symbol "%" means "per hundred." For example, 45% means 45 out of 100. Percentages are widely used in finance, sales, health, statistics, education, and daily life to compare proportions and changes.

Common uses of percentages include calculating discounts, interest rates, taxes, exam scores, tips, and population growth or reduction.

Common Percentage Problems Solved by This Tool

What is X% of Y? – e.g., What is 25% of 200?
X is what percent of Y? – e.g., 50 is what percent of 250?
Percentage increase or decrease – e.g., If a product goes from $80 to $100, what is the percentage increase?
Percent change between two values – e.g., From 120 to 90, what’s the percent decrease?
Reverse percentage – e.g., If a price after 20% discount is $80, what was the original price?

Our calculator includes separate input modes for each of these problems, so you can focus on your specific scenario.

Percentage Formulas Explained

To find X% of Y: (X / 100) × Y
To find what percent X is of Y: (X / Y) × 100
To find percent increase: ((New – Old) / Old) × 100
To find percent decrease: ((Old – New) / Old) × 100
To find original value from percent decrease: Final ÷ (1 – (P / 100))

These formulas are built into our tool, so you don't need to remember them — just enter your values and get instant results.

Real-Life Uses of Percentages

Sales & Discounts: Calculate how much you'll save or spend during promotions.
Tips at Restaurants: Easily figure out 10%, 15%, or 20% tips on your bill.
Grades: Convert raw scores into percentages for exam and coursework evaluations.
Data Analysis: Compare proportions, differences, and trends over time.
Health & Fitness: Track body fat percentage, nutrient breakdown, or progress improvements.
Finance: Determine return on investment (ROI), tax rates, or interest earned.

In short, percentages are everywhere. This calculator is a must-have tool for students, professionals, and everyday users alike.

Who Can Use This Tool?

This tool is for anyone who needs to calculate percentages accurately and quickly:

Students: For math homework, exam scoring, and solving word problems.
Shoppers: To calculate sale prices, savings, and discount amounts.
Business owners: To compute taxes, profit margins, and pricing strategies.
Teachers: To grade assignments or create problem sets involving percentages.
Investors: To measure percent returns, risk exposure, and portfolio changes.
Anyone: For everyday number crunching without a calculator or spreadsheet.

Benefits of Using Our Percentage Calculator

Speed: Get instant answers — no formulas to memorize, no manual math.
Clarity: Clear labels and examples help reduce confusion, even with tricky problems.
Accuracy: Avoid errors in mental math or spreadsheet formulas.
Accessibility: Use it on any device — desktop, tablet, or mobile.
Free to use: No registration, login, or ads — just fast, useful math.

FAQs

Q: Can I calculate percentage change between two values?

A: Yes! Just input the original and new values, and the calculator will tell you the percentage increase or decrease.

Q: Can I find out what percent one number is of another?

A: Yes, that's one of the most popular uses — enter two numbers and you'll get the result instantly.

Q: Is this tool accurate?

A: Absolutely. It uses well-established mathematical formulas and handles decimals precisely.

Q: Can I use this calculator offline?

A: Once the page is loaded, it can still work offline in most browsers. We recommend bookmarking it for quick access.

Q: Do you store my data?

A: No. This calculator runs entirely in your browser — we never store or transmit your inputs.

Start Calculating Now

Whether you’re figuring out how much a 30% discount saves you, checking if your investment grew by 12%, or simply doing your child’s math homework, our Percentage Calculator is the fastest and easiest way to get accurate results. Bookmark this page and use it whenever you need a percentage — no spreadsheet, no formulas, no fuss.