Peel and stick vinyl plank flooring offers mostly standard sizing (see below), but some brands offer a wider variety of options.
If you’re a fan of the wide-plank wood flooring look, then you’ll be pleased! Most peel and stick vinyl planks come in 6” x 36” dimensions, which just qualifies for the wide-plank look.
Thinner and wider planks are available too, but they’re less common.
Tile-wise, 12” x 12” and 16” x 16” formats seem to be the most common—but if you look hard enough you’ll find smaller and larger tiles too. Most (if not all) tiles come in 4-inch increments (8” x 8”, 20” x 20”, etc.).
Anything smaller than 8” x 8” inches is pretty rare.