How do I calculate a discount?

Use 'Subtract X% from Y' calculation type. Enter the discount percentage (e.g., 20) and the original price (e.g., 100). Result shows the discounted price (e.g., $80 for 20% off $100). Alternatively, use 'X% of Y is?' to find the discount amount, then subtract from original.

How do I calculate a tip?

Use 'X% of Y is?' calculation type. Enter the tip percentage (e.g., 15) and the bill amount (e.g., 50). Result shows the tip amount (e.g., $7.50 for 15% tip on $50). To find total with tip, add the tip amount to the bill.

Can I calculate percentage increases?

Yes! Use 'Percentage Increase' calculation type. Enter the original value and the new value. Result shows the percentage increase (e.g., from 50 to 75 is 50% increase). This is useful for growth rates, price increases, or performance improvements.

Are calculations accurate for financial use?

The tool provides accurate percentage calculations using standard mathematical formulas. For financial use, results may need rounding to currency precision (2 decimal places). Always verify critical financial calculations and consider using specialized financial calculators for complex scenarios.

Percentage Calculator - Free Online Tool

When to Use This Tool

Use this when:

You need to calculate discounts, markups, or price changes (e.g., 20% off, 15% markup)
You want to calculate tips, taxes, or service charges as percentages
You're analyzing data and need to find what percentage one value is of another
You need to calculate percentage increases or decreases (e.g., growth rates, price changes)
You want to add or subtract percentages from values (e.g., add 10% to a price)
You're working with financial calculations and need percentage-based computations
You're doing statistical analysis and need to calculate percentages or percentage changes

Don't use this if:

You need complex financial calculations with multiple compounding periods (use financial calculators)
You require percentage calculations with currency conversion (use currency converters separately)
You need to calculate percentages for very large datasets (use spreadsheet software)
You require percentage calculations with specific rounding rules or precision requirements
You want to calculate percentages for non-numeric data or text values

What is a Percentage Calculator?

A percentage calculator performs common percentage operations — finding what percent a number is of another, calculating percentage increase/decrease, finding the value of a percentage, and determining the original number from a percentage result. Our tool runs entirely in your browser.

Percentage calculations appear constantly in business, finance, academics, and daily life: calculating discounts and sales tax, determining profit margins, computing grade percentages, analyzing data changes, and understanding statistics. While the math is simple, doing it quickly and accurately matters.

This tool is useful for business professionals calculating margins and markup, students computing grade percentages, shoppers determining actual savings from discounts, financial analysts calculating percentage changes in data, and managers presenting growth metrics in reports.

Compared to using a basic calculator (which requires remembering formulas), spreadsheet software (which requires setup), or searching 'what is X% of Y' on Google (which requires internet), PureXio's percentage calculator offers multiple calculation modes in one clean interface with instant results.

The tool covers all four common percentage operations: 'What is X% of Y?', 'X is what % of Y?', 'What is the % change from X to Y?', and 'X is Y% of what number?'. Results update in real time as you type, and the tool shows the formula used for educational clarity.

Best for: all percentage calculations — find percentage, calculate change, determine original value. Four calculation modes with formulas shown. Instant results.

How to Calculate Percentages

Select calculation type: 'What % is X of Y?' (find percentage), 'X% of Y is?' (calculate value), 'Percentage Increase' (find increase), 'Add X% to Y' (add percentage), or 'Subtract X% from Y' (subtract percentage)

Enter values in the input fields. Values are calculated in real-time as you type. For 'What % is X of Y?', enter X and Y. For 'X% of Y is?', enter percentage and value

Review the calculated result. Copy the result to clipboard if needed. Use for discounts, tips, taxes, or any percentage calculation

Common Use Cases

Calculate discount: 20% off $100 = $80 (use 'Subtract X% from Y')

Calculate tip: 15% tip on $50 bill = $7.50 (use 'X% of Y is?')

Calculate tax: 8% tax on $200 = $16 (use 'X% of Y is?')

Find percentage: 25 is what % of 100? = 25% (use 'What % is X of Y?')

Calculate increase: From $50 to $75 is 50% increase (use 'Percentage Increase')

Add markup: $100 + 25% markup = $125 (use 'Add X% to Y')

Calculate growth rate: Sales increased from 1000 to 1200 = 20% increase

Features

Calculate what percentage one value is of another (e.g., 25 is what % of 100?)

Calculate X percent of a value (e.g., 20% of 150)

Calculate percentage increase or decrease between two values

Add percentage to a value (e.g., 100 + 20% = 120)

Subtract percentage from a value (e.g., 100 - 20% = 80)

Real-time calculations—results update as you type

100% private—all calculations happen in your browser

Limitations & Constraints

Handles standard percentage calculations—complex financial formulas may require specialized tools

Results are displayed with standard decimal precision—very precise calculations may need more decimal places

Cannot calculate compound percentages or multi-step percentage operations in one calculation

Percentage calculations assume standard mathematical rules—special business rules may differ

Very large numbers may have precision limitations in browser JavaScript

Troubleshooting

Calculation shows wrong result or error

Solution: Check that you entered valid numbers—non-numeric input causes errors. Ensure you selected the correct calculation type. For 'What % is X of Y?', X should be smaller than or equal to Y for meaningful results. Verify input values are correct. Prevention: Enter valid numbers and select the correct calculation type.

Percentage result seems incorrect

Solution: Verify calculation type matches your needs. 'What % is X of Y?' finds percentage (X/Y × 100). 'X% of Y is?' calculates value (X% × Y). 'Percentage Increase' finds increase percentage ((new-old)/old × 100). Ensure you understand which calculation type you need. Prevention: Understand each calculation type before using.

Need to calculate compound percentages

Solution: This tool calculates single-step percentages. For compound percentages (e.g., 10% increase then 5% increase), calculate step by step: first calculate 10% increase, then use that result for the 5% increase. Or use financial calculators for complex compound calculations. Prevention: Break compound calculations into steps.

Results have too many or too few decimal places

Solution: Results are displayed with standard decimal precision. For currency, round to 2 decimal places manually. For percentages, results may show many decimal places—round as needed for your use case. The tool provides precise calculations; you can round results for display. Prevention: Round results manually if you need specific decimal precision.

Want to calculate percentage of percentage

Solution: For percentage of percentage (e.g., 20% of 50%), convert to decimals: 20% of 50% = 0.20 × 0.50 = 0.10 = 10%. Or use 'X% of Y is?' with Y as the first percentage value. The tool handles standard percentage calculations. Prevention: Convert percentages to decimals for complex calculations.