Percentage Calculator
X% of Y, percent change, and price after discount.
Everything you can do with this percentage calculator
Quickly compute X% of Y, the percentage change between two values, or the final price after a discount. The tool works with decimals, negative values, and large numbers so you can use it for invoices, quotes, or classroom examples.
X% of Y
Enter the percentage and the base value to see the result instantly, plus the remainder after the percentage is applied.
% change
Compare an old and new value to learn the increase or decrease in percent, along with the raw difference.
Discount
Supply the original price and a discount rate to see both the amount saved and the final price you should charge.
Worked examples
- 18% of 250 = 45; remaining amount = 205.
- Old 100 → New 120 = 20% increase; difference = 20.
- ₹999 with 10% off = ₹899.10; you save ₹99.90.
Tips for clean results
- Use decimals (e.g., 12.5%) when you need partial percentages.
- If the old value is 0 for percent change, we default to 0% to avoid dividing by zero - interpret this as “not applicable” if needed.
- Click any result to copy it; perfect for pasting into spreadsheets, proposals, or emails.
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FAQ
Can I enter currency symbols? Enter numbers only; currency symbols are optional since the math is unit-agnostic.
Why is percent change 0 when the old value is 0? Dividing by zero is undefined, so we return 0 as a safe default. Annotate results manually if you need a custom label.