My formula is {=SUM(IF(($D$4:$D$100=$D$1)*($B$4:$B$100=$B$1),$G$4:$G$100,0))} it keeps returning a blank cell. The B column has account numbers. The D column has customer numbers and the G column has sales numbers. All are formatted as numbers. No letters, not formatted as text, no dates, auto calculation is on. What other reasons could this not be working?