This is probably quite a 'noob' question to most of you, but I have an excel
spreadsheet set up for a month by month profit and loss that uses formulas to
calculate subtotals/totals/balances both accross and down for me.

However when I enter or edit information into the cells that the formulas
relate to, the totals do not update, it isn't until I actually edit and then
accept the formula cell afterwards that the updated value appears.

If I happen to miss 'updating' the formula in one cell then all other
balances remain as were previously calculated. This is quite frustrating and
I'm sure there is just an option or something that I'm missing somewhere.
Please help.