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# Significant Figures

Hello everyone.

We get lab data reports which have data in the form of

"<0.00657," or 4.2, 300, etc.

How do I create a spreadsheet which will automatically count the number of non- zero digits and display the correct significant figures?

Thanks!

Penny

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## Similar Topics

I tried searching the subject to no avail.

Is there a worksheet function similar to round that will always round but outputs a specified amount of significant figures.

Example:
Cell A1 value = 0.0111
Cell A2 value = 0.00222

Both cells have 3 significant figures and I only need to display 2 significant figures so in theory they should display with rounding:

Cell A1: 0.011
Cell A2: 0.0022

If I use the function Round(A1,3) then Cell A1 displays 0.011 which is correct however if the value of A1 ever changes to 0.00333 or 0.00111 etc. then cell A1 will display the incorrect number of sig figs unless i changed the formula to Round(A1,4) but I don't want to be doing that all the time.

Hope this makes sense.

Working scientific field here and have a requirement to "report the result to 3 significant figures".

Our result is a mean [avg] and it will normally range from .05 to .199.

The quandry is how to format the cell to show "3 significant figures".

For example, the value ".0500" is considered to have 3 significant figures by this client's definition. Which would mean I have to format to at least 4 decimal places. However, if the calculated mean value is .1234, I'm only supposed to show 3 decimal places.

What's a programmer to do? Anyone else face this issue before?

I seem to have hit a limit of 16 significant digits. For example:
1E+15 + 1 = 1000000000000001 (16 significant digits)
(note that 1000000000000000 is displayed but the 1's place value is still
retained)
whereas
1E+16 + 1 = 10000000000000000.
The loss of significant digits can be verified by resubtracting the the
initial large number, e.i.:
1E+15 + 1 - 1+E15 = 1, whereas
1E+16 + 1 - 1+E16 = 0.
Is there a way of getting past this limitation? I need more than 40
significant digits for some rather special calculations. I have created a
workaround which cuts numbers into up to 3 15-significant-digit pieces, but
it's inelegant and requires very long formulas. Thanks.

Can excel cells be defined as a significant figure.

eg a cell containing the caluclation eg 55/3

= 18.333333333

i want that cell only to display 2 significant figures in this case 18

or if the calculation happened to give you an answer of 0.2458955435

then 2 signifcant figures would be 0.2

Thanks

Can i set a range of cells to 3 significant figures automatically? I can only find it possible to do decimals places. Any ideas?

Thanks

Hi Guys and Gals,

I would like to create a simple spreadsheet that will randomly generate numbers and then count the significant figures. I think the easiest way will be to generate the base random number, multiply by 10^(rand), convert to a string, and then count from the left or the right after hitting the first non-zero digit, but I need some help with the string functions.

Column: formula
A: =randbetween(1,999) /some integer 1 to 9999
B: =randbetween(-8,8) /this will be used to move the decimal
C: = A1*10^B1 /this will be the number my students will see
D: Ltrim(str(A1)) /this will convert to a string
E: =if(c1>0,"right","left) /start counting from left or right

Now I need to know how to count the digits after the first non-zero inclusive.

Example: 102405000 Start on the right and skip the zeros, but count from the 5 to the 1 (102405), and display 6 since there are 6 sig. figs.

0.0000230800 Start on the left and skip the zeros, but count from the 2 over to the last 0, and display 6 since there are 6 sig. figs.

Any suggestions? Anybody know of any programs that already do this?

Thanks!!
Jeff Ciaccio
Sprayberry High School
Marietta, GA

In searching this site I found the following 2 formulas which I had hoped would be the solution to my problem.

=IF(A2="","",ROUND(A2,2-(1+INT(LOG10(ABS(A2))))))
=TEXT(A2,"0.0E+00")*1

Both work great in displaying an entered value of .981 as 0.98 (2 significant digits)

However, if a value of 1 is entered, I would expect these formulas to display 1.0 (2 significant digits).

I'm assuming the issue is Excel's ever-so-helpful removal of trailing zeros and can be overcome by custom formatting cells to avoid this. The problem I have is the user wants the option to vary significant digits as 2, 3 or 4. Even with custom formatting, I can't get these formulas to show more than 2 significant digits if a value of 1 [or any other whole number] is entered.

Any suggestions?

I am trying to digitize an ANSI standard that calls for specific rounding and
significant figures rules. For example, variable are specified as "7 sig
figs, simply rounded" or "4 places to right of decimal if pitch is greater
than 40, else 3 places."

I can work through the rounding, truncating, etc, but is there a way to
display these significant digits within a column using one formula? So far,
I've tried something like
"=IF(A12/\$B\$1<10,ROUND(A12/\$B\$1,6),ROUND(A12/\$B\$1,5))" but that won't account
for displaying. I tried conditional formatting, but that won't allow number
formats.

I want everything to be adaptable in case the main variables change (so I
can use a template sheet and copy them programmatically). Anyone have any
ideas?

Thanks,

Pflugs

Is there a way to apply a custom format that will only display a certain
number of significant digits?

For instance for 3 significant digits
Input Values->Display As
0.12345->0.123 or .123
1.2345->1.23
12.345->12.3
123.45->123
1234.5->1230 or 1234

I think I could make a formula that could do this, but I would rather keep
the precision. I just want to adjust the displayed precision.

Using Office 2007, "Duplicate Values" only works on identical numbers.

Is it possible to find values, which are identical to 4 significant figures, if there is a long list of data?

Many thanks!

Hi,

I am wondering if anyone can help me with the following statement.

I have a number (example 1.068501) which i need to round up to 3 decimal places or 4 significant figures if the number is greater than 1 so the result would be 1.069.

If the number was (example 0.926145) then we need to round up to 4 decimal places or 4 significant figures so the result would be in this example would be 0.9262.

Can someone please provide me with a formula for this sort of calculation as I have a spreadsheet of over 500 numbers!

Hi all,

I have a macro that converts data in Excel to XML format. There are certain columns in Excel format that are far too accurate than necessary and I want to reduce the number of significant digits. While this is simple in Excel itself, when I run my macro to convert to XML, the original very long number is used.

Is there any way to use the Excel formatting to, for example, use a number to 3 significant digits rather than 9, 10 etc? Or is there relatively simple VBA code to reduce the number of decimal places in ceertain cells?

Here's my challenge: I want to automate a metric conversion (ounces to grams for instance) and round the result to the number of significant figures in the original number.

Example: 23 ounces converts to 652.039 grams -- rounded to two sigfigs would be 650.

If you can help me out I'd be most appreciative.

(If this has been covered already just point me to the link)

I need to know how to round to significant figures using excel, its for a question in one of my college assignments and i cant seem to find any information.. thankyou!

In my code, I'm calculating a very simple ratio and have the result displayed in a message box. However, I want to have this value only show 1 or 2 significant figures (e.g. if I take 9 / 7, I want to show 1.3 and not 1.28571).

How do I do this?

If I chart x and y values using the scatter option, fit a sixth-order polynomial, display the equation and then use the equation to re-calculate y values from the x values, the answers are totally different to the original data. I think this is a precision issue, and that if I could see the coefficients to more significant figures things might improve.

Does anyone know how to alter the numbers of significant figures in displayed equations or, alternatively, how to access the coefficients independently of the displayed equation? The curve itself fits very well, so the machine is obviously able to use its own equation effectively!

I have a formula that multplies a weekly hire rate by the number of days. This produces figures that have fractions of a penny that are not shown on the sheet. When I autosum these figures, it adds up all these fractions of a penny, and the resulting total does not then appear to agree.

Any suggestions for a quick fix gratefully received.

Thanks Pablo1

Hello,

I want VBA code to control the number of signficant figures in a column. In column E2:E33, values will be entered in these cells from chemical test. However, I want the values to show only 3 sig figures. (ex. 2.534 will be 2.53 or 1.986 will be 1.99. etc...) How do I do this with code?

Thanks for any help.

Hello,
I would appreciate some help to create the VBA code for a User Defined Function that will:

1) First, divide the number in a selected cell (or range of cells) by a constant number, 100
2) Next convert the format of the results into % to two significant figures
3) And finally align the % figures in the center.

E.g. If I have the number 12.23 in a cell, I would first divide it by 100, then format it into percentage in order to get 12.23%.

Thank you.

a

Would someone please help? I have a column of data values between 4 and 7 digits in length. I need to split them into separate columns so that they line up on the right, with blanks placed for non-existant significant figures; that is, the numbers
1111678 and
1234
will have 8 and 4 in a column, 3 and 7 in a column, 6 and 2 in a column, 1 and 1 in a column, and blanks for the ten-thousand, hundred-thousand, and millions places for the row containing 1234. It's important that I don't have leading zeros (I was able to do it with MID() and Text(), but it gave me leading zeros) so that I can count the number of zeros accurately in, say, the hundred-thousands place.
Thanks!
~A Noob

Regardless of how wide I make a cell, if its format is 'General' Excel seems to round to 10 significant digits [less if cell width is smaller]

Anyone know how I can format a cell as a number with an unknown/unlimitted # figures on either side of the decimal?