A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi! This usually happens because the amounts are not being stored as real numbers, even though they look like currency values. In Excel, SUM/AutoSum ignores text values, so if those cells were imported, pasted from another source, or include hidden spaces/apostrophes, the result can stay at £0.00. A quick check is to click one of the amount cells: if it is left-aligned, shows a warning icon, or changing the format to Number does not help, Excel is likely treating it as text.