Twin-size mattress (US) Size Guide

A US twin mattress (also called a single) is 38 x 75 inches, or 97 x 191 cm (965 x 1905 mm). It is the smallest standard adult mattress, made for children, single sleepers, bunk beds, and small rooms.

This guide covers the exact twin dimensions, how they compare to a twin XL and a full, how little floor space the bed needs, and how much a twin mattress weighs.

Quick Answer: How Big Is a Twin Mattress?

A standard twin is 965 mm wide and 1905 mm long (38 x 75 in, 3 ft 2 in x 6 ft 3 in). Thickness is usually 150 – 300 mm. It weighs roughly 12 – 25 kg.

Twin Mattress Dimensions at a Glance

• Size: 965 x 1905 mm / 96.5 x 190.5 cm / 38 x 75 in
• Twin XL: 965 x 2032 mm (38 x 80 in), same width, 127 mm (5 in) longer, common in college dorms
• Two twins = a king: two twin XL side by side (1930 mm) equal a standard king
• Minimum room: about 2.1 x 2.4 m with a walkway on one long side and the foot

What Does a Twin Mattress Look Like in Size?

The sleep surface is about 1 m wide and 1.9 m long, roughly the footprint of an interior door plus a little width. It gives one adult a comfortable sleep area but is short for people over about 6 ft (1.83 m), which is why the twin XL exists.

6 Everyday Comparisons for a Twin Mattress

1. A twin XL mattress (965 x 2032 mm) is the same width but 127 mm (5 in) longer.
2. A full/double mattress (1372 x 1905 mm) is 407 mm (16 in) wider and the same length.
3. A queen mattress (1524 x 2032 mm) is 559 mm wider and 127 mm longer, about 1.7 times the area.
4. A standard interior door (813 x 2032 mm) is 152 mm narrower and 127 mm longer than a twin.
5. A 3-seat sofa (about 2000 mm wide) is a little longer than the twin.
6. A single bed sheet folded once roughly matches a twin’s footprint.

Twin Mattress Size in Different Units

How Much Room Does a Twin Bed Need?

The mattress is 0.97 x 1.91 m. With a frame and a 600 mm (2 ft) walkway on one long side and the foot, a twin fits a room as small as 2.1 x 2.4 m. Two twins in a shared kids’ room need about 3.0 x 2.7 m with a gap between them. Bunk beds stack two twins in the footprint of one.

How Much Does a Twin Mattress Weigh?

A twin is the only standard adult mattress one person can usually carry and manoeuvre alone, and it fits through a 762 mm doorway without turning.

Common Mistakes When Comparing Twin Mattress Dimensions

1. Assuming “twin” means two-person. A twin is a single-sleeper bed; the name comes from rooms that hold two of them.
2. Confusing twin and twin XL. Same width, but the XL is 5 inches longer, which matters for tall sleepers.
3. Buying twin sheets for a twin XL. The extra length usually needs XL-specific fitted sheets.
4. Forgetting bunk-bed limits. Many bunk frames take a twin up to a set thickness (often 150 – 200 mm); a thick mattress raises the guard-rail risk.
5. Sizing the room to the mattress only. Add a walkway and frame overhang.

Frequently Asked Questions

How big is a twin mattress in cm?

97 x 191 cm.

How big is a twin mattress in feet?

3 ft 2 in wide by 6 ft 3 in long.

Is a twin the same as a single?

Yes, “twin” and “single” refer to the same size in most of North America and the UK respectively.

What is the difference between twin and twin XL?

Same width; the XL is 5 inches (127 mm) longer.

Is a twin big enough for an adult?

For width, yes. For length it can be short for people over about 6 ft, who often prefer a twin XL.

How much does a twin mattress weigh?

About 12 – 25 kg.

Final Takeaway

A US twin mattress is 38 x 75 in (97 x 191 cm), weighs 12 – 25 kg, and fits a room as small as about 2.1 x 2.4 m. It is a single-sleeper size, the twin XL adds 5 inches of length for tall sleepers, and two twin XL mattresses side by side equal a standard king.