# SIHOO M18 Ergonomic Office Chair, Adjustable Lumbar and Headrest, 330 lb

Source: https://www.ranked10.co.uk/home-office/best-office-chair/sihoo-m18-ergonomic
Ranked #1 in "Best Office Chair 2026: The Measurements Nobody Publishes": https://www.ranked10.co.uk/home-office/best-office-chair

- Price: £129.94 (checked on Amazon UK on 2026-09-11)
- Amazon rating: 4.3 from 15,877 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B07GNDDNMW?tag=ranked10-21

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.

## Specification

| Field | Value |
|---|---|
| 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 |

## 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.