Mattress Depth Guide: Will My Mattress Fit My Bed Frame?

By the Kinky Beds teamPublished 2 October 20262 min read

Width and length get all the attention, but depth matters too. A mattress that's too deep can sit awkwardly high on a frame; one that's too shallow can look lost. Here's how to check.

How to measure

1. Lay the mattress flat on a level surface.
2. Hold a ruler or tape vertically against the side, at the deepest point.
3. Include any pillow top or permanently attached topper.
4. Measure in a couple of places and use the largest figure.

Typical depths

These are typical ranges; always measure your own.

Why a maximum depth matters

A bed frame is designed around a range of mattress depths:

• Proportions: the mattress should sit at a pleasing height relative to the side rails and headboard.
• Getting in and out: an overly deep mattress raises the sleeping height.
• Restraint use: on a bed with integrated restraint points, the designer has positioned the points with a mattress depth range in mind.

The Sovereign Bed

The Sovereign Bed takes standard UK mattresses up to 30 cm deep: a Double mattress (135 × 190 cm) or a King mattress (150 × 200 cm). If your mattress is deeper than 30 cm, or you're unsure, email support@kinkybeds.com before you order.

The Sovereign Bed

From £599.00 · Free UK delivery

• Restraint rings hidden behind interchangeable decorative panels that swap in under 60 seconds, no tools
• Solid hardwood frame with a 150kg load rating
• Double (4ft 6in) or King (5ft), for standard UK mattresses up to 30 cm deep
• Onyx Black or Alabaster White · plain, unmarked packaging · 14-day returns

See The Sovereign Bed Add-on: Kinky Bundle

Toppers

A removable topper adds depth. If your mattress is close to 30 cm, add the topper's depth before deciding.