Enter the desired sum and sum length, and the possible sums window will show all the combinations of the numbers 1-9 that add to the sum, using exactly the number of terms specified by the length and without repeating any numbers.
Possible sums:
For Kakuro puzzles, each clue is a sum. This calculator can figure which numbers might fulfill the clue. Remember that the numbers could be used in any order in the puzzle. Kakuro puzzles are also called cross sums or cross addition.
For Killer Sudoku puzzles, each numbered “cage” on the puzzle is a sum. This calculator can figure out which numbers might fulfill the clue. You'll also want to keep in mind the additional constraints on Sudoku that repititions are disallowed not only within the sum cage but also within each row, column, and 9-entry square (just like normal Sudoku). Killer Sudoku puzzles are also called killer su doku, sumdoku, sum doku, addoku or samunamupure.