PowerBlock Pro 100 (Single)

In this powerblock pro 100 (single) review, the headline is simple: this is the heaviest adjustable dumbbell in our 2026 guide, and it ranks #8 of 9 because that power serves a narrow group. It adjusts from 5 to 100 lb per hand, so it fits lifters who press and row near triple digits. The included expansion kit covers Stages 1, 2 and 3, which means you get the full range in one box. PowerBlock holds a 4.5 star average from 99 Amazon ratings. At 19.2 x 7.6 x 7.7 inches, the frame stays compact for a dumbbell that weighs 100 pounds. One note before you buy: $599 buys a single dumbbell, so a matched pair costs close to $1,200.

Day to day, the PowerBlock Pro 100 works like a small rack in one frame. The magnetic polypropylene pin lets you move up or down in seconds, and the 2.5 lb adder weights give you fine jumps. Available increments run 2.5, 5, 7.5, 10, 15, 17.5, 20, 25, 27.5, 30, 35, 37.5 and 40 lb per hand, then the three expansion stages carry you to 100 lb. The 38 mm knurled grip is thicker than most home dumbbells, so it suits big hands and heavy pressing. On top of that, the frame accepts PowerBlock straight bars, curl bars, kettlebell handles and stands, all sold separately. In practice, that turns one purchase into a modular home gym as your strength grows.

Value is where this purchase gets complicated. By contrast with lighter adjustable sets in our guide, you pay $599 for one dumbbell, and the rating rests on just 99 Amazon reviews, which is thin for a product at this price. Even so, no other pick in the guide reaches 100 lb per hand. If you rarely press past 50 lb, the PowerBlock Elite EXP is the smarter buy. Meanwhile, beginners will carry years of unused capacity in a 100 pound frame. For lifters who already move serious weight, though, this is the one to get: it replaces a full rack, holds up under heavy pressing, and grows with the expansion stages already in the box. Just budget for two.