What this calculator does
Sum of digits works out adds up the individual digits of a whole number in one pass (not repeated to a single digit). Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaFor n with digits d₁d₂…dₖ: sum = d₁ + d₂ + … + dₖ
The inputs explained
| Field | What to enter |
|---|---|
| Number | A number. Starts at 48213. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with number
Every other input is held at the calculator’s starting values while number varies. Select any row to load that scenario into the calculator.