Work out sudoku solving time instantly with clear inputs, formula shown and shareable results.
Empty cells are 81 minus the givens, and the estimate multiplies your easy-grid pace per cell by a difficulty factor drawn from the technique depth each rating requires. Fewer givens does not automatically mean harder: a 17 given puzzle can be routine, while difficulty rating reflects which solving techniques are actually required.
Cells to fill
empty cells = 81 - given numbers
Estimated time
seconds = empty cells x your seconds per cell x difficulty factor
empty cells = 81 - given numbers. Empty cells are 81 minus the givens, and the estimate multiplies your easy-grid pace per cell by a difficulty factor drawn from the technique depth each rating requires.
Fewer givens does not automatically mean harder: a 17 given puzzle can be routine, while difficulty rating reflects which solving techniques are actually required.
Enter given numbers on the grid, rated difficulty, your seconds per cell on an easy grid. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.