What are the standard mattress sizes?

The standard mattress sizes in the US are: Twin (38" × 75"), Twin XL (38" × 80"), Full (54" × 75"), Queen (60" × 80"), King (76" × 80"), and California King (72" × 84").

What size is a queen mattress?

A queen mattress is 60 inches wide and 80 inches long (152 cm × 203 cm). It's the most popular size for couples and provides a good balance of space and room requirements.

What size is a twin mattress?

A twin mattress is 38 inches wide and 75 inches long (97 cm × 191 cm). Twin XL is 38 inches wide and 80 inches long (97 cm × 203 cm), providing 5 extra inches in length.

What size is a king mattress?

A king mattress is 76 inches wide and 80 inches long (193 cm × 203 cm). It offers the most sleeping space for couples, equivalent to two Twin XL mattresses side by side.

What size is a full mattress?

A full mattress (also called double) is 54 inches wide and 75 inches long (137 cm × 191 cm). It's suitable for single sleepers who want extra space or couples in tight spaces.

What are the dimensions of a queen size mattress?

Queen size mattress dimensions are 60 inches × 80 inches (152 cm × 203 cm). The area is 33.3 square feet (3.1 square meters).

What are the dimensions of a king size mattress?

King size mattress dimensions are 76 inches × 80 inches (193 cm × 203 cm). The area is 42.2 square feet (3.9 square meters).

What are the dimensions of a full size mattress?

Full size mattress dimensions are 54 inches × 75 inches (137 cm × 191 cm). The area is 28.1 square feet (2.6 square meters).

What are the dimensions of a twin size mattress?

Twin size mattress dimensions are 38 inches × 75 inches (97 cm × 191 cm). Twin XL dimensions are 38 inches × 80 inches (97 cm × 203 cm).

How big is a queen size mattress?

A queen size mattress is 60 inches wide by 80 inches long (152 cm × 203 cm), covering 33.3 square feet (3.1 square meters) of floor space.

How big is a full size mattress?

A full size mattress is 54 inches wide by 75 inches long (137 cm × 191 cm), covering 28.1 square feet (2.6 square meters) of floor space.

What's the difference between King and California King?

King mattresses are 76" × 80" (wider but shorter), while California King mattresses are 72" × 84" (narrower but longer). California King is ideal for tall sleepers over 6'2".

How do I choose the right mattress size?

Consider your room size, number of sleepers, and personal space preferences. Queen is the most popular size for couples. King offers more space but requires a larger room (at least 12' × 12').

What size mattress fits a full-size bed frame?

A Full (Double) mattress, which measures 54" × 75", fits a full-size bed frame. Full and Double refer to the same mattress size.

Can I use a queen mattress on a king frame?

No, a queen mattress (60" × 80") will not fit properly on a king bed frame (76" × 80"). The mattress will be too narrow and may shift or cause safety issues. Always match the mattress size to the bed frame size.

Mattress Size Chart & Converter

Find the perfect mattress size for your bedroom. Compare dimensions across US, UK/Ireland, Australian, New Zealand, and European standards. Check room requirements and make an informed decision.

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How to Choose the Right Mattress Size

1. Consider Your Room Size

Measure your bedroom and ensure there's enough space around the bed. A good rule of thumb is to leave at least 2-3 feet of walking space on all sides.

2. Number of Sleepers

For single sleepers, Twin or Full works well. Couples should consider Queen (most popular) or King for more space. California King is ideal for tall couples.

3. Personal Space Preferences

If you prefer more personal space while sleeping, choose a larger size. King offers the most space for couples, equivalent to two Twin XL mattresses side by side.

4. Bed Frame Compatibility

Ensure your mattress size matches your bed frame. Using a smaller mattress on a larger frame (or vice versa) can cause safety issues and discomfort.

Mattress Size & Room Matching Guide

Twin/Twin XL: Best for rooms 7' × 9' or larger. Ideal for children's rooms, guest rooms, and small apartments.

Full (Double): Requires at least 9' × 9' room. Good for single sleepers who want extra space or couples in tight spaces.

Queen: Minimum room size 10' × 10'. The most popular size for master bedrooms. Perfect balance of space and room requirements.

King: Needs at least 12' × 12' room. Best for spacious master bedrooms. Offers maximum sleeping space for couples.

California King: Requires 12' × 13' room. Ideal for tall sleepers (over 6'2") or narrow but long bedrooms.

Special Mattress Sizes

RV Mattress Sizes

RV mattresses are typically shorter than standard sizes. RV Queen is 60" × 75" (5" shorter than standard Queen), and RV King is 72" × 75" (5" shorter than standard King).

Crib Mattress Sizes

Standard crib mattresses measure 27.25" × 51.625" (69.2 cm × 131.1 cm) according to ASTM F1425 safety standards. Mini cribs use 24" × 38" mattresses.

Non-Standard Sizes

Some mattress sizes are not part of the ISPA (International Sleep Products Association) standard but are available from certain manufacturers:

Small Single (30" × 75"): Primarily used in UK/Europe. Limited availability in the US market. May require special ordering.
Full XL (54" × 80"): Same width as Full but 5 inches longer. Not an ISPA standard. Limited availability, typically requires special order.
Olympic Queen (66" × 80"): 6 inches wider than standard Queen. Very limited availability, may require custom ordering from specific manufacturers.

Note: Non-standard sizes are marked with a "Non-Standard" label in the converter. These sizes may have limited availability and may require special ordering or custom manufacturing.

Custom Sizes

Some manufacturers offer custom mattress sizes for unique bed frames or special requirements. Always measure your bed frame before ordering a custom size.

Data Sources:

Standard mattress sizes: ISPA (International Sleep Products Association)
RV mattress sizes: RV Industry Association
Crib mattress sizes: ASTM F1425 Standard
Room size recommendations: Based on industry best practices
Last updated: January 13, 2026