Yes indeed the standard rough in size for toilets is 12.
Toilet rough in size 11 5.
In most cases you can measure the distance between the wall and the toilet hold down bolts as these bolts are usually located at the drain center.
Remember the center of the toilet flange to the wall should be 12 inches.
If you select the wrong rough in size for your bathroom you will either end up with a toilet that will not fit or one with a large gap between the back of the tank and the finished wall.
The four 12 toilet models i mention here are also good to use as 11 25 inch rough in toilets or 11 5 inch rough in toilets.
You should find the rough in measurement in the new toilet s product information.
If your measurement comes out to 11 5 or 12 5 then don t worry it s likely a 12 rough in.
If you measure a few times and come up with 10 or 14 inches you will need to replace with the proper size toilet.
Follow these step by step instructions for measuring the toilet rough in.
The standard rough in is 12 inches though you may encounter 10 inch and 14 inch rough ins in older homes.
The 12 inch rough in is by far the most common in the us.
Toilets are typically offered in either 10 inch 12 inch or 14 inch rough ins.
I d say 80 of toilets have a 12 rough in so don t be surprised if you do as well.
There are however other rough in sizes.