I have a calibration sheet that lists the number of months required between calibration dates and a column that states when the last calibration was carried out. I would like to use these 2 columns to calculate the date when the equipment next requires calibration. Can anyone help? Thanks, Colin

HERE is a link to a thread that wanted to do the same exact thing. Have a date in one column, a number (of months to add) in a second column, and a formula in a third column (date type) that will add that number of months to the original date. I took the formula there and updated the column names to the ones in your screenshot. NOTE: Your screenshot shows a typo in a column name. You have "Calbration" in the screenshot and "Calibration" in your post. I used the first when I updated the formula below so that it would match the column name. If you enter the formula before changing the spelling in your column, the formula will automatically update with the new spelling. If you change the spelling in the sheet first, then you will need to add the "i" to each appropriate cell reference in the formula to get it to work. =DATE(YEAR([Calbration Date]@row) + ROUNDDOWN((MONTH([Calbration Date]@row) + Months@row) / 12, 0) + IF(IF(MOD(MONTH([Calbration Date]@row) + Months@row, 12) = 0, 12, MOD(MONTH([Calbration Date]@row) + Months@row, 12)) = 12, -1), IF(MOD(MONTH([Calbration Date]@row) + Months@row, 12) = 0, 12, MOD(MONTH([Calbration Date]@row) + Months@row, 12)), DAY([Calbration Date]@row))

Adding a number of months to a date using formulas

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Paul Newcome ✭✭✭✭✭✭

05/06/21

In the formula, everywhere that you see the dropdown column name referenced, wrap it in a VALUE function
Replace
[Dropdown Column Name]@row
with
VALUE([Dropdown Column Name]@row)

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Adding a number of months to a date using formulas

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