King Size Mattresses
A standard king measures 76″ × 80″ — sixteen inches wider than a queen, four inches wider than a California king. The choice for couples who want max personal space, co-sleeping families, and master suites designed to feel like a retreat.
Widest standard sizeRest Easy
Fast, Free & Same-Day Delivery
Rest Assured
3,000+ 5-Star Reviews
Rest Well
120-Night Comfort Trial
Rest Tonight
Sleep Now, Pay Later
A king is 76″ wide × 80″ long.
Sixteen inches wider than a queen. Four inches wider and four inches shorter than a California king. The grandest standard size on the market — and the one with the most precise room requirements.
- Dimensions
- 76″ × 80″
- Min room size
- 12′ × 12′
- Recommended room
- 12′ × 14′
- Space per person
- 38″ each — a Twin XL apiece
- vs Queen
- 16″ wider, same length
- Fits frames
- King, adjustable base, split king platform
Five ways to build a king.
Including split king — two Twin XLs on an adjustable base with independent firmness. If you and your partner have very different sleep preferences, this is the size that solves that problem.
Top luxury brands in king size.
King is where every luxury flagship comes into its own. Three of the brands we carry deepest in this size — all in stock at our 5 LA showrooms.
Every king mattress in stock.
Filter by type, firmness, brand, and price.
Queen vs Standard King vs Cal King.
The three biggest sizes, compared inch-for-inch. Standard king is widest; Cal King is longest and narrower; queen is the step down for smaller rooms.
| Feature | Queen | You’re hereStandard King | Cal King |
|---|---|---|---|
| Width | 60" | 76" | 72" |
| Length | 80" | 80" | 84" |
| vs King | 16" narrower | - | 4" narrower, 4" longer |
| Min room size | 10′ × 10′ | 12′ × 12′ | 12′ × 12′ |
| Recommended room | 10′ × 12′ | 12′ × 14′ | 12′ × 14′ |
| Best for | Couples, most rooms | Max width, co-sleeping | Tall sleepers 6′4″+ |
| Price (LA) | From $439 | From $599 | From $699 |
Who a king is built for.
The king is the decision for couples and families who prioritize space over footprint. Five groups get the most value from the 76″ × 80″ surface.
Couples wanting max space
At 76″ wide, a king gives each partner roughly 38″ — more than a Twin XL each. The extra 16 inches over a queen is significant: less encroachment, less disturbance, and real room to spread out.
Master suites
The king is the standard for master suite bedrooms. In a room 12′×12′ or larger, a king anchors the room with space for nightstands, dressers, and comfortable walking clearance on both sides.
Taller sleepers
At 80″ long, a king accommodates sleepers up to 6′6″ comfortably. If you’re over 6′2″ and want room to stretch without your feet hitting the footboard, king (or Cal King for even more length) is the right call.
Co-sleeping families
Couples who share the bed with young children or infants often choose king specifically for the width. The 76″ surface gives everyone room without anyone being crowded to the edge.
Luxury primary bedrooms
For master bedrooms designed to feel like a retreat, a king anchors the room. Luxury flagships — Tempur-Pedic LuxeAdapt, Stearns & Foster Estate, Chattam & Wells Kensington — are most often bought in king.