# Help With Simple Formula

#### VitesseCarOwner

##### Board Regular
I have a subtotal which equates to 86%, I know that I need a further 14% to equal 100%. How do I calculate the actual number from the 86% to make 100%?

For example 172 = 86%, I know I need 28 more items (14%). Therefore if I have 172 items and no that I need 14% more what formula would I use to calculate it?

Thanks

### Excel Facts

Did you know Excel offers Filter by Selection?
Add the AutoFilter icon to the Quick Access Toolbar. Select a cell containing Apple, click AutoFilter, and you will get all rows with Apple
Try

=A1/0.86

Like this?

Excel Workbook
ABC
2Number%Amount needed
31720.8628
Amount Needed

Thanks, I've spent ages trying to figure out how to calculate the figure correctly. I should have paid more attention to what my maths teacher was saying at school!

Thanks, I've spent ages trying to figure out how to calculate the figure correctly. I should have paid more attention to what my maths teacher was saying at school!
Being a former maths teacher, I'd have to say that is true for most people.
Anyway, glad you are sorted now.

Peter, you referred to the percentage being .86 in your answer. Being a former maths teacher...........

and it gives a negative answer.....

Peter, you referred to the percentage being .86 in your answer. Being a former maths teacher...........
I'm not sure what you are saying?
0.86 is a percenatge. It is just a different way to write 86%

and it gives a negative answer.....

your formula with numbers is 172/(.86-172)

We don't open a newspaper and read that .86 of the population have 2 or more televisions at home......

your formula with numbers is 172/(.86-172)
I don't see any parentheses in my formula, which means the standard order of operations with division coming before subtraction. I actually posted my spreadsheet screen shot with formula and result & it clearly isn't negative. Did you try it?

We don't open a newspaper and read that .86 of the population have 2 or more televisions at home......
True, but a newspaper would be one of the last resources I would use for a mathematics definition. Here are a couple of definitions:

Percentage

In mathematics, a percentage is a number or ratio as a fraction of 100. It is often denoted using the percent sign, “%”, or the abbreviation “pct.”
For example, 45% (read as “forty-five percent”) is equal to 45/100, or 0.45
per·cent·age (pr-sntj)
n.
1.
a. A fraction or ratio with 100 understood as the denominator; for example, 0.98 equals a percentage of 98.
.. and one final comment from Excel:

Excel Workbook
ABC
186%0.86TRUE
Sheet2

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