Here are some techniques for calculating percentages. For these examples, we have a simple sheet of travel expenses and you are after the percentage results of prices going up or down for the total and for the individual months.
Let’s say you anticipate more travel the following year and want to know what the cost will be if the expenses increase by 8 percent.
Tip: Excel lets you type percentages either with a percent sign or as a decimal. For example, you can enter twenty percent as either 20% or 0.2 (with or without the leading zero). Excel will treat them both the same.
In B19, enter:
Or if you like, enter it as:
The amount will be 77,555.
If you think travel expenses will decrease by 8% instead, enter this in B20:
Or if you like, enter it as:
Maybe it’s late in the day and you don’t want to calculate in your head that 92% is an 8% decrease. You can enter the formula this way for the same result:
Tip: Remember the Order of Operations are Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction. (Please Excuse My Dear Aunt Sally.)
But what if you want to see the 8% amount itself, not the new total? The formula in B21 would be:
This is the formula you’d use to calculate sales tax in New York City, if B18 contained the total sale.
While all this math is correct, you might prefer to put the percentage in its own cell, rather than hard-coding it into the formulas. That way, you can change the percentage without having to rewrite the formulas.
If we put the percentage by itself in B23, these formulas would do the trick:
Finally, we might want to calculate the percentage change between two numbers. That would give us a clear picture of whether costs were heading up (a positive percentage) or heading down (a negative percentage). In this expense sheet, we’ll calculate the percent change from one month to the next and put the formulas down column C.
The general rule to calculate a percentage change is:
=(new value-old value)/old value
Since January is the first month, it doesn’t have a percentage change. The first change will be in February, so this is the formula for C6:
By default, Excel displays this as a decimal, so click the Percent Style button on the Home tab to format it as a percent. You’ll now see this:
Tip: The keyboard shortcut for Percent Style is Ctrl + Shift + %
Now auto-fill the formula down to the bottom: roll the mouse pointer over the dot in the lower-left corner of the cell that shows -16% and double-click the mouse. That’s a faster way of filling down to the bottom of the column than dragging down.
Hi, I believe % change is related to the change of the original number.
So, % change = (New Value – Old Value)/Old Value
I teach at a local community college and sometimes have my students search for examples that we can do together. Thanks!
I wondered why the change % didn’t work – then I realised because it’s wrong. THANK YOU Russ.
I can’t thank you enough. I’m not a big Excel fan but this will patch up what I need to pernest until I get through some MATLAB code or R. Thanks a ton.
Thank you, explained in detail that was well understood.
Landing cost 2240, saled 2264 margin 24=%?
And excel formula pls….
the percentage calculation is helpful, however when comparing the result i find the if statement =IF((D11/C11*30)<30,D11/C11*30,"30") result of 30 a non-numeric number and cannot be used in calculations, i've tried changing the formatting of the cell to a number so that i can add the 4 cells where the if statement was used to place a number with no luck, any suggestions?
what’s the formula if i want to get % of an amount and ad it to the TOtal
Need to get a quick percentage calculation. There is a way of doing it by highlighting cells. I have seen it but cannot remember
total 500. quick calculation of percentage is requited.
If my hotel ran 45.1% this week and is down -36.3% from last year same week what’s the formula to know what I ran last year?
I am wanting to calculate current years increase over last year, but I want to show negative in red. When using your formula I can show in red, but it will show 100% as 1.00. I prefer the red and parenthesis, but want the 1.0 to show as 100 and (.50) to show as (50%) in red. Is there a formula I can do for this?
How can I increase the amount by 50% (it increases every month from jan to june) jan – 500 feb-? Mar-? ….
In order to increase the amount by 50% you will take the amount and multiply it times 1.5 (=amount X 1.5). You can then copy and paste your formula down.
Nice Tips articles and comments too.
Thank you so very much for this. My Director asked me to do a spreadsheet with the price comparison between two suppliers but percentage difference. I thought how the hell do you that. I couldn’t ask anybody in the office as everybody normally asks me how do do formulas on Excell. Then I googled it and found this page. I cant wait to send my comparison to her tomorrow. Lifesaver site this one. Don’t need an excell course just ask Bob Flisser