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sql server - Determine row size for table

How to I determine the maximum row size for a table? I'm looking for a tool or script that does this so I don't have to add up each column's size by hand.

My goal is to produce a report of tables that are too wide so we can look into restructing them. I know we have several that are so wide that only 1 row fits on each 8K page, but I want to find the rest.

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Another way, run this then look at MaximumRecordsize

dbcc showcontig ('YourTableNameHere') with tableresults

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