Will it Fit?

I'm replacing an old toilet and decided to go with a Toto Ultramax. I might hire a local plumber to install it (I simply don't trust my own skills).

I'd like to be sure that the toilet I buy will fit in the space available. What do I have to measure to be certain of a good fit?

Bill

All the info you need is in Terry's post in this thread. https://terrylove.com/forums/showthread.php?t=30768

For the Ultramax, you need at least 11-1/4" from the back wall to the center of the drain.
That would normally be the bolt caps on the existing toilet.

I don't know what area you live in, but toilets all pretty much install the same.
Your local plumber should have no problem installing a new Toto toilet.