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I have calculation options set to automatically update. Row : [A2 A3] [1] [2] A1 here would equal 3 When I change it using POI: [A2 A3] [2] [5] A1 still equals 3 until I click on that cell. I am more wondering why excel does not update the cells automatically, not just when I click on them. // set A1=2 and perform write operation, check the value of A3 it is still showing 9. The point is that Excel caches previously calculated results and you need to trigger recalculation to updated them.