How Wide Is a Double Mattress? Understanding Double Bed Dimensions

If you’re asking “How wide is a double mattress?”, you’re likely measuring a bedroom, choosing a bed frame, or deciding whether a double is big enough for one or two people. This guide explains standard double mattress width, how it compares to other sizes, and what to keep in mind before you buy.

What Is a Double Mattress, and How Wide Is It?

In many regions, a standard double mattress (often called a full mattress) typically measures:

• Width:135 cm (about 54 inches)
• Length:190 cm (about 75 inches)

So when you ask “How wide is a double mattress?”, the straightforward answer in most standard sizing systems is about 135 cm / 54 inches wide.

However, mattress sizes can vary slightly by country and manufacturer, so it is always worth checking the specific measurements before pairing a mattress with a frame, base, or bedding.

Why Does Double Mattress Width Matter?

Knowing how wide a double mattress is helps with:

• Room planning: Ensuring there’s enough space to walk around the bed, open drawers, or place bedside tables.
• Sleeper comfort: Deciding whether a double is wide enough for one person to stretch out, or for two people to share.
• Accessory sizing: Choosing correctly sized bed frames, mattress protectors, sheets, and duvets.

A double mattress is often seen as a step up from a single or twin, giving extra room for solo sleepers and a cozy fit for two.

How Does a Double Compare to Other Mattress Sizes?

Here’s a simple comparison to see where a double sits among other common mattress sizes:

*Not used in every region
**Names and exact dimensions differ by country

This table helps put “How wide is a double mattress?” into context: a double is wider than a single but narrower than a king, often chosen as a good middle ground.

Is a Double Mattress Wide Enough for Two People?

A double mattress at about 135 cm / 54 inches wide can:

• Suit one adult who wants room to move without taking up too much floor space.
• Fit two adults, though the space per person is more limited than on wider sizes.

Many couples use a double mattress successfully, but some may prefer a wider size for more personal space, especially if one or both sleepers move around at night.

Tip 💤: If you’re unsure, try marking out 135 cm on the floor with tape or measuring two chairs side by side at that width to visualise how much room you would share.

Do Double Mattress Widths Vary by Country?

Yes, regional mattress standards can differ. While the idea of a “double” is similar, the exact measurement might change slightly.

Common variations include:

• Some places use “full” instead of “double,” often with the same or nearly identical measurements.
• Certain regions offer extra-long doubles, keeping the width the same but adding length for taller sleepers.
• Manufacturing tolerances can mean a mattress is a few centimetres or fractions of an inch different from the stated size.

For this reason, always check the listed dimensions, not just the size name.

What Should I Check Before Choosing a Double Mattress?

When you know how wide a double mattress is, the next step is seeing how it fits into your space and lifestyle. Consider:

• Bedroom layout:
  • Can you leave at least 45–60 cm (18–24 inches) of clearance on each side for easy movement?
• Existing furniture:
  • Will bedside tables, wardrobes, or doors still open comfortably once the bed is in place?
• Bedding compatibility:
  • Sheets, protectors, and toppers should be labeled for double/full to match the width properly.
• Long-term use:
  • Think about who will sleep on it most often: one person, two people, or occasional guests.

✅ Quick Mattress Takeaways

Key points to understand about “How Wide Is a Double Mattress”:

• A standard double mattress is about 135 cm (54 inches) wide and 190 cm (75 inches) long.
• Double and full usually refer to the same size in many regions, but always confirm exact measurements.
• A double is wider than a single and can work for one spacious sleeper or two people with a snug fit.
• Width standards can vary slightly by country and brand, so check the specific dimensions given.
• Before choosing a double, measure your room, bed frame, and bedding to ensure a comfortable and practical fit.

Understanding how wide a double mattress is makes it much easier to plan your space, match your bed accessories, and decide whether this popular size is the right choice for your sleep setup.