Built with AI in under 60 seconds
This percentage calculator was built using AI code generation. It handles all common percentage calculations — from basic math to tips and discounts. Everything runs in your browser, no data is sent anywhere.
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How to Use the Percentage Calculator
This tool handles five of the most common percentage calculations. Simply find the section that matches your question, enter the numbers, and click Calculate. For basic percentages (“What is 15% of 200?”), enter the percentage and the number. For reverse calculations (“45 is what percent of 200?”), enter both values. For percentage change, enter the starting and ending values. The tip and discount calculators work the same way — enter the amounts and get instant results.
Common Uses for Percentage Calculations
Percentages are everywhere in daily life. Shoppers use them to calculate discounts and sale prices. Students need them for grade calculations and exam scores. Business professionals calculate profit margins, growth rates, and commission amounts. Restaurant goers figure out tips. Investors track portfolio returns. Tax calculations, loan interest, and budget planning all rely on percentages. Having a quick, reliable calculator eliminates mental math errors and saves time.
Frequently Asked Questions
What’s the difference between percentage change and percentage difference?
Percentage change measures how much a value increased or decreased from an original amount (e.g., “sales grew by 25%”). Percentage difference compares two values without designating one as the original. Our “percentage change” calculator computes the change from the first value to the second.
How do I calculate a tip?
Use the Tip Calculator section — enter the bill amount and the tip percentage (15%, 18%, or 20% are common). The tool shows both the tip amount and the total including tip.
How do I find the original price before a discount?
If an item costs $75 after a 25% discount, divide the sale price by (1 minus the discount): $75 ÷ 0.75 = $100. You can verify this using the “What is X% of Y?” calculator.