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Location: Irving, Tx
Maybe 15 yrs ago, I asked the same question. I did not like the answer...40 to 50 inches. That was too big to be practical. The table I built had a three turned column pedestal, so IIRC, I was able to use a 28" round base. The table was for my daughter; eaten off of it many times, tipping has never been a problem. Having all that weight in the center makes a huge difference!!!!!!
"I tried being reasonable..........I didn't like it." Clint Eastwood
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Joined: Jun 2001
Location: Troy IL
Brad , I use this site for close enough dimensions and have bought great quality parts too.
Adams wood products if you are going for a 4 leg on a 60" it recommends 10" column with 14" legs that would put it at about 38 depending how they measure. from the flat spots a bit shorter. (click on) the click here for dimensions.
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Don's woodshop