IKEA HEMNES Daybed Mattresses: What Actually Fits in the US (2026 Buyer's Guide)
By Erin Mitchell · Updated June 2026
Independent editorial guide. Affiliate links may be present; we never accept payment for coverage.
Quick Take
The US HEMNES daybed uses two standard twin mattresses, 74.5 inches long by 38.25 inches wide. In sofa or single-bed mode they stack vertically. Pulled out into king-width mode they sit side by side, producing a 76.5-inch wide platform that is still only 74.5 inches long. That king mode is 5.5 inches shorter than a true California king or standard king, which surprises buyers expecting a real king-bed footprint.
Critical constraint: each mattress must be 5-6 inches thick maximum. Thicker mattresses make the stacked sofa-mode height comically tall and won't fit under the typical decorative pillow setup. IKEA's own ÅSVANG, ÅGOTNES, and VANNAREID twin mattresses are pre-sized for the frame and ship as a bundle. Third-party twin foam mattresses in the 5-6 inch range work fine as long as the thickness limit is respected.
Jump to the specific 6-inch twin mattresses that fit, plus the mattress-protector pick that handles dual-mode use. See picks ↓
The HEMNES daybed sells well because it does four things at once: storage drawers below, a single twin bed at standard sofa height, a king-width bed when pulled out, and a daybed sofa during waking hours. The catch nobody warns first-time buyers about is the mattress sizing, which is genuinely non-standard once you account for the dual-mode design and the thickness constraint.
This guide covers what actually fits in the US version, which mattresses owners report working well, and the practical compromise of the pulled-out king mode being 5.5 inches shorter than a true king. The HEMNES daybed in the US uses standard twin mattresses, not the 80x200cm EU sizing some online discussions reference: that confusion produces buying mistakes that cost owners real money.
The Actual US HEMNES Daybed Dimensions
Per IKEA's official US product specification: the HEMNES daybed accepts two twin mattresses measuring 74.5 inches long by 38.25 inches wide. Side-by-side, the two mattresses produce a 76.5-inch wide platform. The frame itself accommodates this exact size: any twin mattress at standard US dimensions fits the frame without modification.
Two important notes on the dimensions. First, a standard US king mattress is 76 inches wide by 80 inches long. The HEMNES daybed pulled out is roughly king-width (76.5 vs 76) but significantly shorter (74.5 vs 80). For sleepers over 5'10", the foot of the bed will be a tight fit even in the king-width configuration. Second, the EU version of the HEMNES daybed uses 80x200cm mattresses, which is different from US twin and a source of confusion when researching mattress options across international forums.
The Thickness Constraint: Why It Matters
Each mattress must be 5-6 inches thick maximum. The frame design assumes mattresses in that thickness range for both functional and aesthetic reasons. In sofa mode (single-bed configuration), the two mattresses stack vertically. With 6-inch mattresses, the stacked total is 12 inches above the frame: roughly bar-stool seating height, manageable for sitting. With 10-inch mattresses (a common modern thickness), the stack is 20 inches above the frame: actually too tall for comfortable sitting, with the back cushions visually buried below the seat surface.
Homsee's HEMNES review documents the thickness reality: "If you buy thick, pillow-top mattresses, the seat height becomes comically high," and "standard spring mattresses are often too thick; when stacked, they make the daybed too high for comfortable sitting." The practical rule that emerges from owner reports: stay at or below 6 inches per mattress, ideally 5-6 inches. Foam mattresses in this range are widely available; spring mattresses generally are not.
Option 1: IKEA's Own Pre-Bundled Mattresses
IKEA sells the HEMNES daybed in three pre-bundled configurations: with ÅSVANG (medium-firm polyurethane foam, $349 total with frame), with ÅGOTNES (firm coil, $429 total), or with VANNAREID (firm pocket coil, $499 total). All three IKEA mattresses are sized exactly for the HEMNES daybed and fit the thickness constraint by design.
The ÅSVANG is the cheapest and the IKEA recommendation for the daybed setup. It's a polyurethane foam mattress at 5 inches thick with a 100% recycled polyester cover. Owners report it's adequate for sofa-mode daily use and acceptable for occasional guest sleeping, but thin enough that a single sleeper will feel the slat platform under sustained nighttime use. For frequent guest-room duty, the ÅGOTNES coil version is the better long-term value.
Option 2: Third-Party Twin Foam Mattresses (6 Inch or Less)
Owners who skip the IKEA bundle and order separate twin mattresses report consistent success with 6-inch foam mattresses from the major Amazon vendors. The category is well-served: MLILY, FORTNIGHT BEDDING, FDW, and Best Price Mattress all sell 6-inch twin foam mattresses at $80-150 each, CertiPUR-US certified, with 4.0-plus star ratings on real owner volumes.
Homsee notes a critical buying detail: "ensure they are not more than 5 or 6 inches thick." Owners ignoring this constraint and buying 10-12 inch mattresses report sofa-mode unusability and end up returning or replacing the mattresses. The 6-inch ceiling is non-negotiable for functional dual-mode use.
Option 3: What Definitely Doesn't Fit
Avoid: standard 10-12 inch hybrid mattresses (too tall for sofa mode), pillow-top mattresses (additional 2-4 inches of loft pushes any base mattress over the thickness limit), twin XL (80 inches long instead of 75 means the foot of the mattress overhangs the frame), and full-size mattresses (54 inches wide doesn't match the 38-inch frame channel).
Owners who try to economize by re-using existing twin mattresses from another bed often hit the thickness problem. A mattress that's 10 inches tall works fine on a regular twin frame but produces an unusable HEMNES daybed in sofa mode. If your existing twin is over 6 inches, plan to replace it for the HEMNES setup.
The King Mode Caveat: 5.5 Inches Shorter
Pulling out the daybed into king-width mode produces a 76.5-inch wide by 74.5-inch long platform. A standard king is 76 inches wide by 80 inches long. The HEMNES king mode is therefore about right on width but 5.5 inches short on length. This matters for taller sleepers and for couples using the king mode as their primary nightly bed.
Most owners report the king mode is fine for occasional guest sleeping (two adults under 5'10") but uncomfortable for longer-term use. Sleepers over six feet will find their feet hanging off. The original design intent for the HEMNES daybed is sofa-by-day, single-bed-by-night, with king-mode as an occasional accommodation: owners who follow that pattern report satisfaction. Owners using king mode nightly more often regret the height-constrained mattress choice.
Mattress Protectors: Get One
Both mattresses see dual-mode duty (sat on during the day, slept on at night). The wear pattern is heavier than a normal twin bed, with the top mattress in stack mode bearing both sitting and sleeping load. A waterproof mattress protector on each mattress extends their useful life by an estimated 2-3 years, particularly the top mattress which gets the most use.
Stretch-fit protectors that accommodate 5-6 inch mattresses are the right product class. Avoid deep-pocket protectors designed for 10-plus inch mattresses, which don't tension properly on thin foam and bunch up under sitting weight.
When HEMNES Isn't the Right Daybed
If the primary use case is a real second bed (regular guest sleeping for adults, college-age kids visiting often), the HEMNES daybed compromise on length and thickness makes a standard twin XL bed plus a separate storage solution a better investment. If the primary use case is a sitting room sofa that occasionally sleeps a guest, the HEMNES delivers exactly what it promises. Most regret about the HEMNES comes from buyers expecting full-time king-bed functionality and discovering the length and thickness limits after purchase.
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What owners say
Real owner reports from the threads and editorial sources we drew on for this guide.
“If you buy thick, pillow-top mattresses, the seat height becomes comically high.”
— Homsee
“Standard spring mattresses are often too thick; when stacked, they make the daybed too high for comfortable sitting.”
— Homsee (mattress thickness)
“Two twin mattresses are placed on top of each other when you use the daybed as a single bed, and next to each other when you use it as a double bed.”
— IKEA (official spec)
“Standard spring mattresses are often too thick; when stacked, they make the daybed too high for comfortable sitting.”
— Homsee (long-term)
Sources
Homsee: Is the IKEA Hemnes Daybed Worth the Hype (3-Drawer Classic) · Homsee: Honest Review of the IKEA Hemnes Daybed (mattress specifics) · IKEA: HEMNES daybed with 3 drawers and ÅSVANG mattresses (US official) · IKEA: HEMNES daybed frame with 3 drawers, twin (frame-only US official)
