How much can a 3 inch drain tolerate?

Mchiarit

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I am doing some remodeling. I currently have two bathtubs, a shower, three toilets and three sinks draining to one three inch (3.5" O.D.) main pvc drain pipe. I plan to add a shower and a sink. Is this a problem?
 
Three toilets is the max on three inch. As long as you don't add another toilet you are fine.
 
Another question

Thanks plumguy.
Just out of curiosity, what is the max permitted toilets for four and six inch drains?
 
Off the top of my head I think 4" you can have something like 48 toilets. I do stand to be corrected! As far as 6" I have no idea don't use it much!
 
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