Percentage Calculator
Free percentage calculator — work out what is X percent of Y, percentage increase or decrease, discounts and percentage difference instantly online.
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About the Percentage Calculator
Our free Percentage Calculator helps you solve any percentage problem instantly. Calculate what percent one number is of another, find a percentage of any number, or determine the percentage change between two values. Perfect for homework, shopping discounts, grade calculations, and everyday math problems.
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Practical use cases
For Students & Exams
- Calculate test scores — got 42 out of 50? That's 84%. Track more with our Grade Calculator.
- Convert fractions to percentages for math homework.
- Calculate weighted assignment contributions to final grades.
For Shopping & Finance
- Calculate sale discounts — 25% off $80 = $20 savings.
- Figure out tip amounts at restaurants (15%, 18%, 20%).
- Determine interest rates on savings or loans.
For Teachers
- Quickly grade papers and calculate class averages.
- Determine grade distributions and pass rates.
- For classroom use, teachers can also use tools like Random Student Picker and Classroom Timer.
When to use it
Students: Calculate test scores, assignment grades, or find percentages for math homework.
Shoppers: Determine sale prices and how much you'll save with discount percentages.
Teachers: Quickly grade assignments and calculate class averages.
Business: Calculate profit margins, price increases, or budget allocations.
Finance: Determine interest rates, investment returns, or tip amounts.
Examples
Calculating a Sale Price
If an item is $80 and there's a 25% discount, use '25% of 80' to find the discount amount ($20), then subtract from the original price to get $60.
Finding Your Test Score
If you got 42 questions right out of 50, use 'X is % of Y' with X=42 and Y=50 to find you scored 84%.
Calculating Price Increase
If gas went from $3.50 to $4.20, use '% Change' to find it increased by 20%.
Compared to alternatives
Percentage vs Fraction vs Decimal
25% = 1/4 = 0.25. Percentages are fractions out of 100, making them easier to compare. Fractions are exact ratios. Decimals are used in calculations. All three represent the same value differently.
Use this section to compare purpose, output, and the best-fit tool for the task.
Percentage Increase vs Percentage Points
Going from 10% to 15% is a 5 percentage point increase but a 50% increase. This distinction matters in statistics, finance, and reporting. The percentage calculator shows the relative change.
Use this section to compare purpose, output, and the best-fit tool for the task.
Percentage Calculator vs Grade Calculator
This tool solves general percentage math, while our Grade Calculator specifically handles weighted academic grades with multiple assignments and letter grade conversion.
Use this section to compare purpose, output, and the best-fit tool for the task.
Reference
Quick-look benchmarks and standards.
- Standard tip
- 15–20%
- Sales tax (US avg)
- 6–10%
- Passing grade
- 60–70%
- A grade
- 90–100%
- Half
- 50%
- Quarter
- 25%
- Third
- 33.3%
- Two-thirds
- 66.7%
Verified benchmarks
Frequently asked questions
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How to Improve Focus While Studying
Calculate Your Final Grade
Use weighted grade calculations to track your academic performance across assignments.
Grade CalculatorPractice with Free Worksheets
Generate printable math, English, spelling, and handwriting worksheets to lock in what you've learned.
Generate WorksheetsFor classroom use, teachers can use this calculator for live demonstrations of percentage concepts. Tools like Random Student Picker and Classroom Timer can enhance interactive math lessons.
Study mode
Don’t just calculate — understand better
Practice related problems, build confidence, and retain concepts faster with guided learning tools.