Going a little deeper, using the VarType() function. I wont paste the whole script here just upto the line it chokes on (in red) because its quite large. This typically happens when a calculation involves very. You can avoid this by appending & to one of the operands to make it a Long literal, for example (362& 100) / 2005. An overflow error in Excel occurs when a calculation exceeds the largest number that Excel can handle. I am using a 64bit version of excel in windows 7. Because the Integer type in VBA is 16 bits signed, and 36200 overflows its maximum value of 32767. In your case, if the first number is 25.1, instead of 25, it gets automatically converted to double, thus later you will not have problems, as far as Double*Integer = Double Sub TestFunction() I have read a little about overflow errors and have checked my data thorough to confirm its type (long) and it all fits. Asking for help, clarification, or responding to other answers. This error is caused by the VB Script function CInt, which gives an overflow error when using a number that is. Thanks for contributing an answer to Stack Overflow Please be sure to answer the question.Provide details and share your research But avoid. Here you will not have any problems, because 43333 is automatically converted to long and it is ok: Option Explicit The reason for the failure was: Overflow: cInt. If the first number is bigger than integer (32767) or is explicitly converted as a Double, Long, Single, then it is ok. Any worksheet has many times more rows than that, and that makes Integer an inappropriate data type to use for storing worksheet row numbers. The problem in your case is that when VBA tries to sum numbers it has its own logic, going through Integer first and then parsing it to the number on the left. 2 Answers Sorted by: 2 Dim lrow As Integer That's a 16-bit signed integer type, with a maximum value of 32,767 (215-1): it will overflow as soon as you assign it to 32,768 or higher. What this script needs to do is look in column AI, if there is no " x" present it will hardcode the row, if there is an x present it will skip the line.
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