how big is a double mattress
A standard double mattress (also called a full) is usually about 54 inches wide by 75 inches long, or roughly 135 cm by 190 cm.
Quick Scoop
A double mattress is designed for one adult who wants more space than a twin, or for two people who do not mind sleeping fairly close together.
In many guides, “double” and “full” are the same size, so if you see either term on product pages, you can assume they mean roughly 54 x 75 inches unless stated otherwise.
US vs UK / Europe
In North America, the common double/full size is about 54 x 75 inches (137 x 190 cm).
In the UK, a standard double is typically listed as 135 x 190 cm, which is effectively the same size but expressed in metric.
At‑a‑Glance Size Table
| Region / Name | Dimensions (inches) | Dimensions (cm) |
|---|---|---|
| US/Canada – Full/Double | ≈54 x 75 | ≈137 x 190 |
| UK – Standard Double | ≈54 x 75 | 135 x 190 |
| EU – Double (common) | ≈55 x 79 | 140 x 200 |
Meta description (SEO):
Wondering how big a double mattress is? A standard double (full) mattress is
about 54 x 75 inches (135 x 190 cm), big enough for a roomy single sleeper or
a cozy couple.
Information gathered from public forums or data available on the internet and portrayed here.