## Excel calculations: automatic, manual, iterative

Aug 09, 2018· How to force recalculation in Excel. If you have turned off Excel automatic calculation, i.e. selected the Manual calculation setting, you can force Excel to recalculate by using one of the following methods.. To manually recalculate all open worksheets and update all open chart sheets, go to the Formulas tab > Calculation group, and click the Calculate Now button.