A standard king size bed typically measures 76 inches wide by 80 inches long (about 193 cm x 203 cm).

Quick Scoop

  • Standard (US) king: 76" x 80" (about 193 x 203 cm).
  • UK king: about 60" x 79" (5'0" x 6'6", 150 x 200 cm).
  • It’s the widest common mattress size made for homes, great for couples who want extra space.

Common King Variants

  • Standard/Eastern King : 76" x 80" – what most people mean by “king size bed.”
  • California King : 72" x 84" – slightly narrower but longer, for taller sleepers.
  • In some regions (like the UK and parts of Europe), “king” is closer to 60–65" wide and around 78–80" long, so measurements can vary by country.

Simple Size Table (mattress only)

Region / Name Width Length
US Standard King 76 in (≈193 cm) 80 in (≈203 cm)
US California King 72 in (≈183 cm) 84 in (≈213 cm)
UK King 60 in (≈150 cm) 79 in (≈200 cm)
Bed **frames** are usually a bit larger than the mattress (often a couple of inches extra on each side), depending on design and materials.

If you’re measuring your room, a good rule of thumb is to allow at least about 30" (≈76 cm) of free space on the sides so you can move comfortably around a king bed.

TL;DR: If you’re in North America and asking “what are the dimensions of a king size bed,” the expected answer is 76" x 80". In the UK and some other regions, “king” is closer to 60" x 79" , so always double‑check local sizing charts.

Information gathered from public forums or data available on the internet and portrayed here.