Free percentage calculator
Answer “what is X percent of Y?” for schoolwork, budgets, reports, targets, and everyday decisions.
● Your numbers stay in this browser.
18 × 240 ÷ 100
From question to answer in three moves.
Choose whether to find the part, the percentage, or the whole.
Enter the two known values.
Read the answer and the exact formula used.
The calculation is visible, not a black box.
Choose the correct unknown: part, percentage, or whole. A zero whole cannot be the divisor when finding a percentage; a zero percentage cannot be the divisor when finding the whole. Displayed values are rounded.
Formula usedanswer = percentage × number ÷ 100percentage = part ÷ whole × 100whole = part × 100 ÷ percentage
Calculation checks updated 27 September 2026: automated tests cover sample inputs and numeric boundaries, not every possible input or commercial rule.
Math without mystery.
How do I calculate a percentage of a number?+
Divide the percentage by 100, then multiply by the number. For example, 20% of 80 is 0.20 × 80 = 16.
Can I use decimals or negative numbers?+
Yes. PercentNest accepts decimal and negative values when they are meaningful for your calculation.
Does the calculator store my numbers?+
Calculations run in your browser and are not uploaded. Selecting Save stores that calculation in this browser’s local storage until you delete it. Use Delete in saved history, or Delete saved calculation in CAGR, final grade, and compound interest. Reset changes current inputs only; it does not delete a saved calculation.