Rank #1 in Best Office Chair 2026: The Measurements Nobody Publishes
SIHOO M18 Ergonomic Office Chair, Adjustable Lumbar and Headrest, 330 lb
Price and rating as shown on Amazon when we collected them. Both change.
The SIHOO M18 is the most reviewed office chair in this ranking by a wide margin — 15,877 ratings at 4.3 stars — and the only one whose listing publishes the two dimensions that decide whether a chair fits: overall height 110cm to 125cm, and seat height 43cm to 51cm. It costs £129.94, the most expensive here, with a 330 lb capacity in its title and a breathable mesh back.
It takes first place on that specification plus the sample behind it. What it gives up is spending: the Keratee below is £50 cheaper and better rated from a much smaller sample.
How those 15,877 ratings break down
An average hides its own shape. This is the spread behind the 4.3 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Ratings | 4.3 from 15,877 |
|---|---|
| Capacity as listed | 330 lb |
| Seat height | 43 to 51 cm |
| Overall height | 110 to 125 cm |
| Back | Breathable mesh |
| Armrests | 2D |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“Brilliant chair. Easy to assemble and totally adjustable”
Verified purchase“I rarely leave feedback, but you guys worth my feedback time. Your product looks great and your customer service -amazing! Please, keep it up.”
What it is up against
The rivals it was ranked against in Best Office Chair 2026: The Measurements Nobody Publishes.
Rank #2
Keratee Ergonomic Office Chair with Adjustable Lumbar and Flip-Up Arms
£79.99
Rank #3
SONGMICS Executive Office Chair with High Back, PU Leather, OBG22BUK
£85.99
Rank #4
CASTLOVE Fabric Office Chair with 14cm Thick Cushion, Linen, Grey
£109.99
Rank #5
Youhauchair Office Chair, Ergonomic Desk Chair with Flip-Up Armrests
£89.98
Questions people ask
What is the seat height?
43cm to 51cm, with an overall height of 110cm to 125cm. No other chair in this ranking publishes those figures.
What does 330 lb mean?
It is the rated capacity in pounds, about 150kg — the same figure the SONGMICS executive chair claims in kilograms.
Why is it the most expensive chair here?
You are paying for the sample behind it, 15,877 ratings, and for a published specification rather than photographs to guess from.
Is it good for tall people?
The published range answers that: a 51cm maximum seat height suits a taller desk.
What is a W-shaped seat?
A seat profile that centres you on the cushion, with a waterfall front edge to reduce pressure under the thighs.
How many ratings does it have?
15877 at the time of collection, averaging 4.3 stars, with 65 per cent five-star and 6 per cent one-star.
Comments
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