We do okay with two boxes for two cats.

Or just trial and error. My 2 cats are fine with 2 litter boxes.

Lucky,
Pam

I had 2 boxes for 2 cats.

p.s.  they pee'd in one and pooped in the other!

Several of you have posted back something to the effect that "well I
have 2 cats and only 2 boxes and it works for me".

Whatever works folks... is the bottom line.

If it stops working (i.e: your cat starts eliminating outside the box),
among other things, it is perhaps times to rethink your litter box
strategy.

More boxes does mean each box may stay cleaner longer in a multi-cat
household. Note I said MAY. That will only happen if they use ALL the
boxes on a more or less equal basis.

If you have kittens and a multi-level home you really are best to have a
box on each level the kitten has access to... same thing if you have a
very large home on one level... more than one box is a good idea for
kittens until they mature.

Until last week, I had one box for 3 cats. I had two boxes before, but
they didn't use the one. Back when there were more cats in the house,
we had more boxes, but all of my cats are in the basement, so we ended
up going down to one box.

With the addition of Jay Jay, I added another box. Four cats on one
box seemed a bit much, and Jay Jay is larger. Oddly, he seems to use
both boxes, actually started with the smaller box. But the other cats
seem to like the larger box more, even though it is in the same spot
as the box they never used. So, they seem to prefer a larger box,
something I didn't know.

By accident, I discovered I need an extra box upstairs right now. Jay
Jay is hesitant to walk through the living room since the dogs hang
out there. So, if he is upstairs while I am at work, he will not go
downstairs to the kitty litter. He used my mom's clothes a couple
nights ago. So, I put a box in the bathtub. He has only used it twice
in 3 days, but it's there if he needs it. Once he is comfortable with
the dogs, I will take it out.

I just bless him. Other than the one incident when no box was
available to him, he used the boxes every time, even with his
diarrhea. He's a very good boy.

Oh, I also learned that the larger box is great because I can fill it
deeper, and there is more space in the middle, so nothing sticks to
the bottom, and very little is stuck to the sides. Scooping is a lot
easier with this larger box. All I need is to find better liners. The
largest liners are a tad small, so I  have the line duct-taped to the
box to keep it in place.

My sister lives next door, but her cat is indoor/outdoor, and they
used to live at our house. So, he still comes through during the day.
He rarely uses the box since he goes outside. But one day, I saw him,
all 4 feet in the box, and his butt hanging over the side. I'll give
him credit for trying, but he totally missed the target.

That is why I bought the larger box for Jay Jay. He's even bigger. But
he still manages to use the smaller box with no problem, and chooses
to use it even with the larger box only 4 feet away.

I dont see a problem with 2 cats sharing one litter box as long as it is
well taken care of.
I live in an apartment and there simply isn't anywhere to put a 2nd or 3rd.
Although, I would never ever consider having 3 for 2 cats.

Ah yes. When I go out of town, I always add another box. Even when
they promise to scoop, they never seem to. So, I add an extra box and
fill the litter as deep as I can to make it last as long. I also buy
enough litter that I can completely change out the boxes rather than
scoop them when I get home.