100 lb adjustable dumbbells buying guide

For lifters who've maxed out a 50-90 lb set and need real headroom

When 90 lb per hand isn't enough anymore

Most adjustable dumbbell sets top out in the 50-90 lb range, including our main-lineup picks. These four are built to reach or approach 100 lb per hand, with real differences in cost, mechanism speed, and floor space.

See the 100 lb picks

Quick answer: Our top pick for 100 lb adjustable dumbbells is the PowerBlock Pro 100 EXP Adjustable Dumbbells (Best Overall for the Full 100 lb Range). If you're looking for toughest build / most expandable, the Ironmaster Quick-Lock Adjustable Dumbbells (75 lb, expandable to 165 lb) is a strong alternative.

Why some lifters need a 100 lb adjustable dumbbell, and most don't

Reviewed by the Dumbbell Guide team · last updated 2026-08-28

A 100 lb ceiling only matters once you've outgrown the 50-90 lb range that covers our main-lineup picks like the PowerBlock Elite EXP or Yes4All set -- think heavy rows, walking lunges, or presses where someone is already loading the top settings of a 90 lb dial and running out of room to progress.

Getting to 100 lb per hand usually means one of two trade-offs: buying a block-style system in stages, paying for expansion kits after the initial purchase like the Pro 100 EXP does, or buying an all-steel screw-lock system upfront that costs more from day one but has real headroom past 100 lb, like the Ironmaster.

It's also worth being honest that a couple of well-reviewed 'near 100 lb' sets, like the Bowflex SelectTech 1090, actually cap at 90 lb -- worth knowing before you buy if the full 100 lb ceiling is the reason you're shopping this category.

Check whether the full weight is included or requires expansion kits

The PowerBlock Pro 100 EXP starts at 5-40 lb and needs three separate expansion kits to reach 100 lb, so the sticker price you see first often isn't the full-range price -- budget for the add-on kits if the 100 lb ceiling is the point of buying it.

A stand matters more at this weight than it does for a lighter set

Racking and unracking 90-100 lb dumbbells off the floor repeatedly adds up; the Ironmaster ships with a stand included, while the Bowflex and MX Select are typically sold as dumbbells only, with a stand as a separate purchase.

Mechanism speed differences grow more noticeable near max weight

Bowflex's turn-of-a-dial system changes weight in seconds even near 90 lb, while Ironmaster's screw-lock collars are reported as one of the slower mechanisms in this comparison -- a bigger deal if you're supersetting at heavy loads than it is at 20-30 lb.

Confirm the increment size near your top working sets

The Ironmaster adjusts in 2.5 lb steps all the way up, the PowerBlock can be set to 2.5 or 5 lb steps once its metal tubes are installed, and the Bowflex moves in fixed 5 lb jumps -- finer increments matter more for slow, controlled progress near a 90-100 lb working weight.

Product Best For Price Rating
PowerBlock Pro 100 EXP Adjustable Dumbbells Best Overall for the Full 100 lb Range $489 (Stage 1, 5-40 lb) up to roughly $1,100+ once fully expanded to 100 lb 4.6/5
Ironmaster Quick-Lock Adjustable Dumbbells (75 lb, expandable to 165 lb) Toughest Build / Most Expandable $699 for the 75 lb pair with stand, plus about $320 for the kit that extends it to 120 lb per hand (165 lb with a second kit) 4.4/5
Bowflex SelectTech 1090 Adjustable Dumbbells Fastest Weight Changes Near 90 lb $499 per pair 4.6/5
MX Select EVO MX100 Adjustable Dumbbells Smallest Footprint at 100 lb $849 - $1,049 per pair 4.6/5
Best Overall for the Full 100 lb Range

PowerBlock Pro 100 EXP Adjustable Dumbbells

★★★★★ 4.6

Reaches 100 lb per hand by stacking three separate expansion kits onto the 5-40 lb Stage 1 base, so the final cost and weight ceiling depend on how many stages you buy. Urethane-coated plates keep the block-style design quieter than the all-steel sets in this comparison.

  • Only block-style system here confirmed to reach the full 100 lb per hand
  • Urethane-coated plates cut down on the metal-on-metal clank of steel adjustable sets
  • Selector pin adjusts in 2.5 or 5 lb steps once the metal tubes are installed, not just fixed 10 lb jumps
  • Reaching 100 lb requires buying Stage 2, 3, and 4 kits separately on top of the Stage 1 base
$489 (Stage 1, 5-40 lb) up to roughly $1,100+ once fully expanded to 100 lb View on Amazon
Toughest Build / Most Expandable

Ironmaster Quick-Lock Adjustable Dumbbells (75 lb, expandable to 165 lb)

★★★★★ 4.4

All-steel screw-lock construction that multiple 2026 gym-gear reviewers describe as drop-tolerant, unlike the plastic-shelled block systems in this comparison -- and it's the only set here with a documented expansion path past 100 lb, up to 165 lb per hand with add-on kits.

  • All-steel construction rated to handle drops, unlike plastic-shelled block dumbbells
  • Expansion kits push the ceiling to 120 lb, then 165 lb per hand -- well past the other three sets here
  • Lifetime warranty on the frame
  • Screw-lock collars are reported as noticeably slower to change than a dial or pin system, a recurring complaint among its roughly 198 Amazon ratings
$699 for the 75 lb pair with stand, plus about $320 for the kit that extends it to 120 lb per hand (165 lb with a second kit) View on Amazon
Fastest Weight Changes Near 90 lb

Bowflex SelectTech 1090 Adjustable Dumbbells

★★★★★ 4.6

Tops out at 90 lb per hand rather than the full 100, so it's not a true 100 lb set -- but its turn-of-a-dial mechanism changes weight faster than Ironmaster's screw collars or PowerBlock's staged pin-and-tube setup, which matters when you're supersetting near your top working weight.

  • Dial mechanism changes weight in seconds, faster than Ironmaster's screw-lock or PowerBlock's pin-and-tube setup
  • Metal knurled handle, an upgrade over the plastic-handled Bowflex SelectTech 552
  • $499 sits well below the fully-expanded cost of the PowerBlock or Ironmaster
  • Caps at 90 lb per hand, short of the 100 lb ceiling the other three sets in this comparison reach
$499 per pair View on Amazon
Smallest Footprint at 100 lb

MX Select EVO MX100 Adjustable Dumbbells

★★★★★ 4.6

Reaches the full 100 lb per hand inside a roughly 16 x 16 inch footprint per dumbbell, using a rack-and-pinion dial that owners report holds steady with no perceptible plate shift -- a tighter space claim than PowerBlock's stacked-kit design or Ironmaster's stand-based system.

  • Full 100 lb per hand in a 16 x 16 inch footprint, the most compact of the sets that actually reach 100 lb
  • Rack-and-pinion dial owners describe as free of the weight-shifting some block systems have
  • One-time purchase price, no separate expansion kits required to hit 100 lb
  • Smaller Amazon review base than the more established PowerBlock and Bowflex lines, so long-term reliability data is thinner
$849 - $1,049 per pair View on Amazon
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Frequently Asked Questions

Which adjustable dumbbells actually reach 100 lb per hand?

Of the four compared here, the PowerBlock Pro 100 EXP (fully expanded), the Ironmaster Quick-Lock (with its 120/165 lb expansion kits), and the MX Select EVO MX100 all reach a genuine 100 lb per hand. The Bowflex SelectTech 1090 tops out at 90 lb, not 100.

Do I need to buy expansion kits to get the PowerBlock Pro 100 EXP to 100 lb?

Yes -- the base Stage 1 set only covers 5-40 lb. Reaching 100 lb means adding the Stage 2, Stage 3, and Stage 4 kits, which brings the total cost to roughly $1,100+ depending on retailer pricing.

Is the Ironmaster Quick-Lock worth it if I might want more than 100 lb per hand someday?

It's the only set in this comparison with a documented path past 100 lb -- its expansion kits push the ceiling to 120 lb, then 165 lb per hand. The trade-off is that its screw-lock collars change weight more slowly than a dial or pin mechanism.

Why include the Bowflex SelectTech 1090 if it only goes to 90 lb?

Because for a lot of lifters shopping this range, a 90 lb dial-adjust set that changes weight in seconds is a better fit than a heavier system that requires expansion kits or slower screw-lock collars -- it's worth comparing even though it falls just short of a true 100 lb ceiling.

View our top pick →