How to choose an adjustable bench by capacity, footprint and frame
Start with the room, then the load. Dimensions (D x W x H) are listed in inches, so measure the corner where the bench will sit and compare. NICEPEOPLE Adjustable Weight Bench lists 46 x 16.7 x 17.2 in, while XCHIEF Adjustable Weight Bench lists 57 x 22 x 22 in. A bench takes floor space in use and again in storage, so check both. Read all three dimensions, not only the depth. KiNGKANG Adjustable Weight Bench lists 51.57 x 13.4 x 31.5 in, which is narrow but tall. For other bench styles, see the weight benches page.
Next, read capacity. Max weight capacity should exceed your body weight plus the weights you press. A higher figure leaves room to grow as you get stronger. A lower one can still suit a beginner who starts with light dumbbells. Frame material rarely decides the choice: the listings give Superior Alloy Steel for NICEPEOPLE and Alloy Steel for the other picks. If you never need to change the backrest angle, a fixed bench may be enough, and the standard weight benches page covers that route.
Two benches are not picks because their dimensions give you nothing to compare. KiNGKANG Adjustable Weight Bench 1050 lb lists the same 1050 lb capacity as the KiNGKANG pick and Carbon Steel, but its own footprint figures are not usable, so the pick with a usable footprint stands in for it. Rockvale Adjustable Weight Bench lists 660 lb, the same as NICEPEOPLE, but no usable dimensions, so you cannot judge how much room it needs and it offers no extra capacity. Before buying any bench, confirm the size with the seller and check the backrest and seat angles the listing describes.