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 Significant digits of a number are the digits which contribute to its accuracy - generally these are all digits except leading and trailing zeros. For a more precise definition please see WolframMathworld. An Excel © worksheet function solution to calculate n significant digits of d (I found this in an Excel forum but I could not identify the original author):A1: dA2: nResult: =--TEXT(A1,"."&REPT("0",A2)&"E+0") Example: If you want to show pi with 3 significant digits:
 The corresponding VBA solution: Function sbNSig(d As Double, n As Long) As Double'Returns double with n most significant digits of d.'09-Nov-2019 by www.sulprobil.com PB V1.00sbNSig = Format(d, "." & String(n, "0") & "E+0")End Function Klaus K. offeres another worksheet formula for this on the web site www.Excelformeln.de: =ROUND(A1,A2-1-INT(LOG(ABS(A1)))) A related function is sbNum2Str which returns a non-scientific string representation of a given number with all significant digits and all leading and trailing zeros.