I'm going to count anything that I could program, script, or otherwise ask to run a computation.
(3) There's four of us humans in the house, but only three that you could ask to do some addition.
(1) The work computer is a HP z-book. It is a G3 model currently, but they're swapping it out for a newer one this month.
(1) The main daily driver for home is a Thinkpad 470s with openSUSE or Fedora on it.
(3) Several older laptops i've kept around as backups. They're in the closet.
(1) An older Synology 4-bay NAS.
(1) A Raspberry pi 4 hooked up to the TV.
(1) A Raspberry pi 3+ sitting in a box; I've been meaning to use if for DNS-based filtering.
(2) Two Mac devices the wife uses.
(2) Two smart phones.
(2) Two ebook readers.
(1) A kids kindle.
(4) 3D printer projects and other projects that have arduinos or something similar.
(2) Graphing calculators
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Total: 24
Not counting a broken dell G5 5505 that keeps going into the shop under warranty, the not-yet-delivered steamdeck, or the collection of slide rules.