Mattress size chart
Every standard US mattress size in inches, centimeters and feet, and who each one suits.
Short answer: the six standard sizes are twin (38 × 75 in), twin XL (38 × 80), full (54 × 75), queen (60 × 80), king (76 × 80) and California king (72 × 84).[1 · Oct 29, 2026] Width and length are standardized; thickness is not, so it varies by model.[1 · Oct 29, 2026]
Standard mattress sizes
| Size | Inches (W × L) | Centimeters | Feet | Surface area |
|---|---|---|---|---|
| Twin | 38 × 75 in | 97 × 191 cm | 3′ 2″ × 6′ 3″ | 2,850 sq in |
| Twin XL | 38 × 80 in | 97 × 203 cm | 3′ 2″ × 6′ 8″ | 3,040 sq in |
| Full | 54 × 75 in | 137 × 191 cm | 4′ 6″ × 6′ 3″ | 4,050 sq in |
| Queen | 60 × 80 in | 152 × 203 cm | 5′ × 6′ 8″ | 4,800 sq in |
| King | 76 × 80 in | 193 × 203 cm | 6′ 4″ × 6′ 8″ | 6,080 sq in |
| California king | 72 × 84 in | 183 × 213 cm | 6′ × 7′ | 6,048 sq in |
| Split king | two 38 × 80 in | two 97 × 203 cm | same footprint as a king | 6,080 sq in total |
Sizes and surface areas from a sleep-research site's mattress size guide;[1 · Oct 29, 2026] a split king is two 38 × 80 in pieces that together make a 76 × 80 in king.[2 · Oct 29, 2026] We converted to centimeters at exactly 2.54 cm per inch[3 · Oct 29, 2026] and rounded to the nearest cm.
Brands round differently. One maker lists its kings at about 76 × 79½ in and its California kings at about 72 × 83½ in, give or take ½ in.[4 · Oct 29, 2026] Another lists the full at 53 in wide rather than 54.[5 · Oct 29, 2026] Check the exact model's listed size if you're fitting a tight frame or alcove.
Who each size suits
- Twin: Kids, teens and single adults under 6 ft.[1 · Oct 29, 2026]
- Twin XL: Teens and single adults over 6 ft.[1 · Oct 29, 2026]
- Full: Single adults under 6 ft; a couple only in a pinch.[1 · Oct 29, 2026]
- Queen: Couples without kids or pets in the bed.[1 · Oct 29, 2026]
- King: Couples who want the most width, or share with a child.[1 · Oct 29, 2026]
- California king: Taller couples, or couples sharing with a pet.[1 · Oct 29, 2026]
Over 6 ft tall? Look for at least 80 in of length: twin XL, queen, king or California king.[1 · Oct 29, 2026] Our size guide walks through the choice.
Less common sizes
| Size | Inches | Centimeters |
|---|---|---|
| Olympic queen | 66 × 80 in | 168 × 203 cm |
| California queen | 60 × 84 in | 152 × 213 cm |
| Split queen | two 30 × 80 in | two 76 × 203 cm |
| RV short queen | 60 × 75 in | 152 × 191 cm |
| Split California king | two 36 × 84 in | two 91 × 213 cm |
Queen variants from one maker's queen guide,[5 · Oct 29, 2026] which notes their bedding and frames are harder to find and cost more.[5 · Oct 29, 2026] The split California king row is our arithmetic: one maker says its California king foundation comes split,[2 · Oct 29, 2026] but we couldn't find a published size for split California king mattresses. Unverified. We couldn't confirm a reliable source for this yet.
RV, Alaskan king, Texas king and crib sizes are on our RV, oversized and crib size page.
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Sources: 1. Sleep Foundation, Mattress sizes and dimensions guide. 2. Saatva help, What are the dimensions of the Saatva foundation?. 3. NIST, SI units: length. 4. Serta, King size mattress dimensions. 5. Casper, Queen size bed dimensions: size, room fit, and how it compares. Checked Oct 29, 2026. Trademarks belong to their owners; figures are restated in our own words and tables, not reproduced.