Excel is a commercially available computer program that is used worldwide. Excel is widely utilized; it is helpful in household ledgers, corporate tax calculations, management of academic grades or reports, etc. However from the beginning, inaccuracies and errors in calculations have constantly been identified, so the program is updated regularly. Decimal-to-binary conversion is a simple and repetitive task. So, use of a computer program to do this calculation is suitable. Errors in

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... inary conversion are surprising and are not easily understood. Therefore, it is important to identify the flaws in Excel, which unfortunately still exist today. It is necessary to determine the cause of this type of error, and I hope for a fix to be implemented quickly.