Price & availability disclaimer: Prices, sales, and inventory shift constantly. Confirm pricing on the manufacturer site before you buy. Sanctuary Mattress earns a commission when you purchase through certain links — at no extra cost to you.
Mattress size is the second-most-expensive variable after brand and tier. Going from queen to king adds $300-$800 to the same mattress. Going from king to California king is often a wash on price but a major change in shape. Here is the complete sizing breakdown.
Standard mattress dimensions
| Size | Dimensions (W x L) | Best for |
|---|---|---|
| Twin | 38″ x 75″ | Kids, single adults, guest rooms |
| Twin XL | 38″ x 80″ | Tall single adults, college dorms |
| Full | 54″ x 75″ | Single adults wanting more space |
| Queen | 60″ x 80″ | Couples in smaller bedrooms |
| King | 76″ x 80″ | Couples wanting maximum space |
| California King | 72″ x 84″ | Tall couples, narrow bedrooms |
| Split King | 2 x (38″ x 80″) | Couples wanting different firmness, adjustable bases |
King vs California King
Standard king is 4 inches wider, 4 inches shorter. California king is 4 inches narrower, 4 inches longer. Pick king if both partners are average height. Pick California king if either partner is over 6 feet tall.
Queen vs King for couples
Queen gives each partner 30 inches of width — narrower than a twin bed. King gives each partner 38 inches — equivalent to a twin XL each. If your bedroom fits a king, get a king. The 8 inches per person dramatically improves couple sleep quality.
Split king explained
Split king is two twin XL mattresses next to each other (38″ x 80″ each, 76″ x 80″ total). The advantage: each partner can choose different firmness, and the mattresses work with split-head adjustable bases. Most luxury brands (Saatva, WinkBed, Brooklyn Bedding) offer split king.
Pricing differential by size
- Twin to Queen: +$300-$600
- Queen to King: +$300-$800
- King to Cal King: Often same price
- King to Split King: +$200-$500
Verdict
Couples sleeping together every night should buy king minimum. Tall sleepers (over 6 feet) should consider California king. Couples disagreeing on firmness should consider split king with two different mattresses.
Reminder: Prices, sales, and inventory shift constantly. Confirm pricing on the manufacturer site before you buy. Sanctuary Mattress earns a commission when you purchase through certain links — at no extra cost to you.