Would
table1.field1 - table2.fieldB
in the refresh of the calculated columns control help? Along with set sparse = .f..

>I have a simple 1-table grid on a form and I want to add a column that calculates an elapsed time from time values in two other fields from the table. I wrote a function that does the calculation, but I can't assign it as Record Source for the column. I also tried the Value property . . no luck. Please help !!!
>
>TIA