To calculate a cost of living (COLA) adjustment in Excel, you can use a simple formula that multiplies the base times the adjustment percentage, then adds the result to the base. In the example shown, the formula in C6, copied down, is:
where cola is the named range F6, and contains the adjustment as a percentage.
The goal in this example to calculate a cost of living (COLA) adjustment for each of the eleven years shown, starting on the second year. The actual adjustment percentage is entered in cell F6, which is the named range cola. Each year, the adjustment should be applied to the previous base amount in column C, starting with the base amount in cell C5.
The formula in cell C6, copied down is:
With 30,000 in C5 as shown, the formula is solved like this:
As the formula is copied down the table, the relative reference C5 changes at each row, while the named rangecola (F6) behaves like an absolute reference and does not change. The result on each new row is the previous year's base plus the adjustment.
To calculate to the total of all adjustments, the formula in F7 is:
In this example, the goal is to increase the prices shown in column C by the percentages shown in column D. For example, given the original price of $70.00, and an increase of 10%, the result should be $77.00. The general formula for this...
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