Steelcase Leap vs Herman Miller Aeron (Size B)
Two of the ergonomic office chairs in our best ergonomic office chairs: herman miller, steelcase, haworth & more comparison, lined up spec by spec. Every figure comes from the manufacturer pages linked below, and the scores use the same published formula as the full ranking.
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Best for: 4D arms, height-adjustable lumbar, 400 lb
Check price at AmazonBest for: The mesh benchmark, sized A/B/C
Check price at AmazonSpec-by-spec comparison
Green marks the better published figure. "Not listed" means the manufacturer doesn't publish it.
| Spec | Steelcase Leap | Herman Miller Aeron (Size B) | Weight |
|---|---|---|---|
| Weight capacityThe heaviest user the maker rates or warranties the chair for. Anything above 400 lb scores the same as 400 lb. | 400 lb | 350 lb | 25% |
| Warranty lengthYears of coverage on the chair's frame and mechanism, as the maker states it. | 12 yr | 12 yr | 20% |
| Seat depth adjustmentHow far the seat slides front to back. A fixed seat scores 0; longer travel fits more leg lengths. Metric figures converted (25.4 mm = 1 in). | 2.95 in | 0 in | 15% |
| Maximum seat heightFloor to top of seat at its highest, with the standard cylinder. Taller users need more. | 21.3 in | 20.5 in | 10% |
| Minimum seat heightFloor to top of seat at its lowest. Shorter users need less to keep feet flat. | 16.1 in | 16 in | 10% |
| Armrest adjustmentsThe number of directions the armrests move (4D = up/down, forward/back, side to side, pivot) as the maker labels them. Unlabeled arms score as the lowest figure. | 4 D | Not listed | 10% |
| Adjustable lumbarYes when the maker lists lumbar support you can adjust (standard or as an option). | Yes | Not listed | 5% |
| Forward tiltYes when the maker offers a forward seat tilt, useful for upright, task-focused work. | Not listed | Not listed | 5% |
| Seat height | 410–540 mm (16.1"–21.3") | Not listed | info |
| Usable seat depth | 415–490 mm (16.3"–19.3") | Not listed | info |
| Arm height from seat | 160–260 mm | Not listed | info |
| Width between arms | 410–510 mm | Not listed | info |
| Weight | Tested to 400 lb (EU shop lists 150 kg) | Not listed | info |
| Sizes | Not listed | A: 300 lb, 14¾"–19" seat; B: 350 lb, 16"–20½"; C: 400 lb, 16"–20½" | info |
| Seat depth | Not listed | Fixed per size (A 16.4", B 17", C 18.9") | info |
| Warranty | Not listed | 12-year, 3-shift | info |
| ErgoPick score | 8.5/10 | 6.0/10 | 100% |
Where each one comes out ahead
Steelcase Leap
Better published figure on: Weight capacity, Seat depth adjustment, Maximum seat height.
What we like
Watch out for
Herman Miller Aeron (Size B)
Better published figure on: Minimum seat height.
What we like
Watch out for
- Armrest adjustments not published by Herman Miller
Verdict
Aeron B is rated 350 vs 400 lb and has a fixed seat; Leap adds 2.95" of seat depth travel, 4D arms and adjustable lumbar. Both carry 12-year warranties.
- Steelcase Leap: Steelcase: Leap cut sheet
- Steelcase Leap: Steelcase Shop: Leap
- Herman Miller Aeron (Size B): Herman Miller: Aeron Chair
- Herman Miller Aeron (Size B): Herman Miller: Aeron product sheet