Methods and systems are provided for bounding data entered into one or more spreadsheet application cells. A bounding function is applied to a given cell that places bounds on values or formula results that may be entered into the cell. If a user enters a value to a bounded cell that exceeds or otherwise violates the bounds applied to the cell, or if a formula directed to the cell evaluates a value to the bounded cell that exceeds or otherwise violates the bounds applied to the cell, the value entered into the cell will be a value most closely approximating the desired value or evaluated value, but that does not exceed or otherwise violate the bounds set for the cell.