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Percentage & Tip Calculator
Work out a percentage of a number, what percentage one number is of another, the percent change between two values, or a tip split between people. Exact arithmetic, so nothing is rounded until it is shown.
Tip-
Total-
Each person-
Formulas
| Calculation | Formula |
|---|---|
| X% of Y | X × Y ÷ 100 |
| X is what % of Y | X ÷ Y × 100 |
| Percent change from A to B | (B − A) ÷ A × 100, shown with a + or − sign |
| Tip | Tip = bill × tip % ÷ 100; total = bill + tip; each share = total ÷ people |
Tip amounts, totals and shares are rounded to the cent, half up, from the exact fraction. Other results show up to 10 significant digits, and the page says when a result is rounded. Everything runs in your browser; no numbers are sent or stored.
How it works
Each number is held as an exact fraction (two whole numbers), so 1 ÷ 3 × 100 is not affected by floating-point error. A result is rounded only at the moment it is displayed.