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How to add a percentage increase to a monthly target in Excel

In this example, I am looking at how to add a percentage increase to calculate a monthly projected fundraising target.

Imagine my team is fundraising for a new community centre. In the last month they raised £76,000. I’d like to increase the total per month, but not put them off, so I want to add 4.5% increase to each month.  So November’s target is 4.5% greater than October’s target, and December’s target is 4.5% greater than November’s figure.

Excel can calculate this all for me.  So I set up a worksheet with the months of the year, and then a column for the current month’s fundraising target as our starting point.  The total is £76,000 and I want the Target Fundraising column for November to show the total as £76,000 plus the 4.5% included. So my formula is =B2*104.5%.

(NB. If I used =B2*4.5% it would show the result as 4.5% of the total.  By adding 100 to the 4.5% the answer will show the sales target including the 4.5%).

When I then copy the formula down the remainder of the column, the formula will take the total figure from the cell above it and apply 4.5%.

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I can see how the formula works by using Formula tab, Formula Auditing, Show Formulas.

NB This is useful if the % increase per month is the same.  If there are changes in % we need to add absolute references…but more on that in another post.

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Excel Training

How to calculate percentage reduction using Excel formulas

One of the many things I like about Excel is that I can set up the formula in one cell and copy it to other cells.

If I want to apply a percentage reduction to a figure, I can set it up for the first line of data and then autofill the relevant cells.  With adverts already reminding us to spend for Christmas and plan for the sales, here is a simple example of applying a percentage price reduction in Excel.

Applying the same percentage discount to multiple items
A shop wants to calculate discounts of 33% for all sale items in the January sale, and an Excel sheet can set these up easily.

All the items will have a 33% reduction applied on 1st January 2013.

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I create a formula using the data in B2 and then copy the formula to the remaining cells in the column

To set up the formula in the first cell, the price in B2 is selected, and then multiplied by 33%.  The formula will appear as =B2*33%.  By clicking enter the discount is applied.  This formula can now be copied down the column.

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Use the autofill handle to copy the formula in the remaining cells.

If the shop now wants to work out the new price, they can add an extra column and take the sale reduction from the original price using a formula.

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Simple formula applied to calculate the new price.

In Column D, the calculation is the original price in column B2 minus the sale reduction in C2.  So the formula is =B2-C2.  This formula is then autofilled down the remaining cells and the new price is updated.

This works well, when you have a same percentage discount applied to a group of items.

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