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Mattress Sizes & Dimensions
Standard US mattress sizes and dimensions, from twin and twin XL to queen, king and California king, with tips for choosing the right size for your room.
The 10 Full Size Mattress Measurements of 2026
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The 10 Mattress Size Comparison of 2026
Trying to figure out which mattress dimensions fit your room and sleeping style can feel overwhelming. The right size makes all the difference between cramped nights and spacious comfort.
The 10 Mattress Mattress Size of 2026
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The 10 Mattress Full Size of 2026
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The 10 Dimensions Of Queen Mattress of 2026
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The 10 King Size Memory Foam Mattress of 2026
A king size memory foam mattress can transform your sleep with pressure relief and motion isolation. We compared the top models available in 2026 to help you choose the right one.
The 10 King Size Mattress Measurements of 2026
A king size mattress measurements are 76 inches wide by 80 inches long. That gives you plenty of room to stretch out without crowding your partner.
The 10 California King Mattress Size of 2026
A california king mattress size offers extra length for tall sleepers. We compared top models in 2026 to help you pick the right one.
Mattress Sizes & Dimensions Buying Guide
Standard US mattress dimensions (width × length) are:
- Twin: 38 × 75 in
- Twin XL: 38 × 80 in
- Full (double): 54 × 75 in
- Queen: 60 × 80 in
- King: 76 × 80 in
- California king: 72 × 84 in
Actual sizes can vary slightly between brands. Two twin XLs side by side make a king surface, which suits split-firmness and adjustable bases.
When choosing a size, leave walking space around the bed (around 24 to 30 in is a common guideline), measure stairways and doorways for delivery, and remember that mattress thickness affects sheet fit: deep-pocket sheets suit thicker mattresses. Taller sleepers often prefer a twin XL or California king for the extra length. Specialty sizes such as RV short queen and Olympic queen are covered in RV and specialty mattresses.