Here's a brief explanation:

A validated Excel sheet for recovery calculation in GC analysis using standard addition typically includes input fields for sample weights, GC responses, standard solution concentrations, and volume added. It calculates recovery percentages based on these inputs, providing a straightforward tool for quality control. While Chromeleon software may offer specific features for GC analysis, creating a customized Excel sheet is a flexible and accessible option for such calculations.

Hello Mr Krishnamoorthy, I know the theory. Do you know if there is a validated Excel sheet for this on the Internet? The problem lies in the validation of such Excel sheets.

You may be "chasing your tail" here! Per the correct explanation of Dr Balamurugan Krishnamoorthy we know what the spreadsheet needs to do. We know that in practical terms "validated" means that the spreadsheet delivers consistent, accurate, correct answers when supplied with correct input data. That should be relatively easy to demonstrate. Beyond that, just who is requiring a "validation" of the calculation program, and how do THEY define it?

The problem is that we perform analysis and method validation for pharmaceuticals. Many Excel tables are used for this, which we also validate ourselves. I'm looking for a commercial validation Excel or other tool to double check our Excel spreadsheets.

Well, good luck with that. Given the "validation" of Excel as a computational package and your own checks of function and performance, I don't see what some other "commercial" package "validating" an already validated set of algorithms is going to do for you. You ARE chasing your tail there, and that is never productive. Maybe you'll feel better, if poorer, just outsourcing the entire project. Further, pharmaceuticals can't hide responsibility or accountability behind "validation" anyway, as most don't even understand the lack of significance of much of the statistics. If I was not retired I'd offer to perform that nth validation for you.