A ¾ size mattress measures 48 inches wide by 75 inches long — wider than a twin, narrower than a full. It's a niche size that most big-box stores don't stock, which makes finding one trickier than it should be.
This guide covers exactly where to look, what to expect, and how to pick the right one.
The ¾ mattress (also called a three-quarter) sits between a twin and a full:
| Size | Width | Length |
|---|---|---|
| Twin | 38" | 75" |
| ¾ (Three-Quarter) | 48" | 75" |
| Full | 54" | 75" |
| Queen | 60" | 80" |
It gives you 10 extra inches of width over a twin — enough to make a real difference for a growing kid or a single adult in a tight room.
Not ideal for: Couples (too narrow), adults over 6' (same length as a twin), or anyone who wants a standard sheet selection.
With 5 showrooms across Los Angeles, LA Mattress Store is one of the few local retailers where you can actually feel a mattress before buying. Staff can help you navigate size options and find the closest match if a true ¾ isn't in stock — or point you toward a custom solution.
Benefits of buying local:
If you have a vintage frame with unusual dimensions, a custom mattress maker is often the right call. You provide the measurements, they build to spec.
Two reputable options:
Expect to pay a premium (typically 20–40% more than standard sizing) and allow 2–4 weeks for production.
Amazon, Wayfair, and specialty foam retailers carry ¾ size options, though inventory varies. Filter by exact dimensions before ordering. Always check:
The downside: you can't test it first, and returns on bulky mattresses can be cumbersome.
Stores like Mattress Firm may carry or be able to order ¾ sizes depending on location. Call ahead — don't assume they stock it.
| Sleep Position | Recommended Firmness | Why |
|---|---|---|
| Side sleeper | Soft to medium-soft | Cushions shoulders and hips |
| Back sleeper | Medium to medium-firm | Supports lumbar curve |
| Stomach sleeper | Firm | Prevents hips from sinking |
| Combination sleeper | Medium | Versatile for position changes |
A ¾ mattress needs to sit on a proper foundation. A standard twin or full base won't work well. If you're working with an antique frame, measure the interior sleeping area (not the frame's outer edge) before ordering.
| Budget Tier | Price Range | What to Expect |
|---|---|---|
| Entry | $200–$500 | Basic foam or innerspring |
| Mid-range | $500–$1,000 | Quality hybrid or memory foam |
| Premium | $1,000+ | Luxury materials, custom options |
The ProAdapt Soft uses TEMPUR-ES comfort foam layered over an APR support core — a genuinely premium feel. It's one of the few luxury brands that can accommodate custom sizing through authorized dealers.
| Pros | Cons |
|---|---|
| Exceptional pressure relief and body contouring | High price point |
| Durable — typically lasts 10+ years | Sleeps warmer than hybrid options |
| Adjustable base compatible | May be too soft for stomach sleepers |
| Removable, washable cover |
View the Tempur-Pedic ProAdapt Soft
A solid mid-range hybrid with individually wrapped coils and plush foam layers. Good motion isolation, strong edge support, and a comfortable plush feel without the premium price.
| Pros | Cons |
|---|---|
| Good balance of support and plush comfort | Not ideal for very firm sleepers |
| Strong edge support | Less body contouring than all-foam |
| Good motion isolation for a hybrid |
View the Eclipse Cares Peacefulness Hybrid
Best for back and stomach sleepers who want firm support with temperature management. Gel memory foam keeps things cooler than traditional foam options.
| Pros | Cons |
|---|---|
| Firm support with gel cooling | Too firm for side sleepers |
| Promotes spinal alignment | Less motion isolation than plush foams |
| Durable tight-top construction |
A ¾ mattress is 48 inches wide by 75 inches long — between a twin (38") and a full (54") in width, and the same length as both.
Mainly because of your bed frame. Many antique and vintage frames were built to ¾ dimensions. A full mattress (54" wide) won't fit properly in them. A twin (38" wide) leaves a 10" gap.
LA Mattress Store's 5 LA showrooms are your best starting point for in-person help. Custom manufacturers (Custom Comfort Mattress, Mattress Insider) can build to spec. Amazon and Wayfair also carry some options online.
Harder than standard sizes. Some retailers carry them, and custom linen companies can make fitted sheets to size. Factor this into your decision — ongoing bedding costs add up.
Yes, if the mattress material supports it (memory foam and latex do well). Check with your retailer about base compatibility before purchasing.
Antique frames, small guest rooms, growing kids who've outgrown a twin, and custom RV or cabin builds where space is tight.
Expect $200–$500 for entry-level, $500–$1,000 for quality mid-range options. Custom-made mattresses typically run 20–40% more than equivalent standard sizes.
Testing is always better when you can. Visit an LA Mattress Store showroom to test comparable firmness levels in person. If buying online, look for a generous trial period (90+ nights) with a straightforward return process.
Rotate every 3–6 months, use a quality mattress protector, and follow the manufacturer's care instructions. Avoid jumping on the mattress to preserve its structure.
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