IKEA duvet sizes vs. US bedding
Updated August 2026
IKEA bedding is designed in centimeters on European proportions, then given American size names. The names line up and the dimensions do not, which is why an IKEA insert bunches inside a US cover and a US insert will not close inside an IKEA one. Five checks, with the arithmetic.
1. IKEA's actual dimensions
IKEA sells duvet covers and inserts at matching dimensions, so a cover and insert bought together always fit each other. The problem starts the moment one half of the pair is American. Conversions below use 1 cm = 0.3937 in.
| IKEA name | Centimeters | Inches | US cover of the same name | Difference |
|---|---|---|---|---|
| Twin | 150 × 200 | 59.1 × 78.7 | 68 × 90 | 8.9″ narrower, 11.3″ shorter |
| Full/Queen | 240 × 220 | 94.5 × 86.6 | 90 × 92 (queen) | 4.5″ wider, 5.4″ shorter |
| King | 240 × 220 | 94.5 × 86.6 | 104 × 92 | 9.5″ narrower, 5.4″ shorter |
Read the King row twice. IKEA's Full/Queen and King duvets share the same 240 × 220 cm footprint, so buying up a size buys you nothing in dimensions — only in fill. Against a genuine US king cover, an IKEA king insert is nearly ten inches too narrow. The full international picture is in the duvet cover size chart.
2. Worked example: IKEA Full/Queen against a US queen
This is the collision almost everyone hits. IKEA Full/Queen is 94.5 × 86.6 in. A US queen cover is 90 × 92 in.
Width: 94.5 − 90 = 4.5 inches wider.
Length: 92 − 86.6 = 5.4 inches shorter.
Now run both directions:
IKEA insert inside a US queen cover. The insert is 4.5 inches too wide, so it compresses along both sides and creates a permanent ridge where it folds against the seam. It is also 5.4 inches too short, so the last five inches of the cover at the foot is empty fabric. Your feet sit under one layer of cotton instead of a duvet.
US insert inside an IKEA cover. The insert is 5.4 inches longer than the bag it must fit into. It will not reach the far corners without folding, the closure strains, and the folded excess sits as a lump across the foot of the bed. Corner ties cannot fix a length mismatch.
On the mattress. An IKEA Full/Queen on a 60 inch US queen mattress: (94.5 − 60) ÷ 2 = 17.25 inches of drop per side, which is 2.25 inches more than a US queen cover gives and generous even on a deep mattress. The same duvet on a 76 inch king mattress: (94.5 − 76) ÷ 2 = 9.25 inches per side, which will not clear a 12 inch mattress, let alone a hybrid. Lengthwise, 86.6 inches over an 80 inch mattress leaves 6.6 inches total, and several of those go under the pillows — hence the cold-feet complaint that follows every IKEA duvet home.
3. The compatibility table
| Insert | Cover | Result | Verdict |
|---|---|---|---|
| IKEA Full/Queen | IKEA Full/Queen | Exact match | Works |
| IKEA Full/Queen | US queen 90 × 92 | 4.5″ too wide, 5.4″ too short | Poor — side ridges, empty foot |
| IKEA Full/Queen | US full 80 × 90 | 14.5″ too wide | Does not work |
| US queen insert | IKEA Full/Queen cover | 5.4″ too long | Does not close cleanly |
| US king insert 104 × 92 | IKEA King cover | 9.5″ too wide, 5.4″ too long | Does not work |
| IKEA King insert | US king cover 104 × 92 | 9.5″ of slack across the width | Poor — insert swims, pools at one side |
| IKEA Twin | US twin 68 × 90 | 8.9″ and 11.3″ of slack | Poor — too small in both directions |
| US twin insert | IKEA Twin cover | 11.3″ too long | Does not work |
| IKEA Full/Queen | US oversized queen 96 × 98 | 1.5″ and 11.4″ of slack | Acceptable only with all eight ties tied |
The rule underneath every row: an insert longer than its cover never works, and an insert more than about 3 inches smaller than its cover slides. Only the two exact-match rows are genuinely comfortable. Anywhere you are forced into a mismatch, ties are the difference between livable and useless — see how to keep a duvet from shifting. Most IKEA covers close with hidden press studs or buttons, and many ship without interior corner ties, which makes retrofit duvet clips worth buying alongside.
4. Warmth grades instead of fill weight
IKEA does not publish fill weight in ounces the way US brands do. Inserts are graded on a four-step warmth scale — roughly cool, all-round, warm and extra warm — which is a relative index across IKEA's own range, not a measurement you can compare to a 40 oz American comforter. The nearest US translation: grade 1 behaves like a 20–30 oz summer weight, grade 2 like a 35–45 oz all-season, grade 4 like a 50 oz-plus winter duvet. Fills range from polyester through duck down. If warmth is the question you are actually asking, duvet vs. comforter sets out the whole layered system.
5. The buying strategy that works
- Buy both halves from the same system. IKEA insert with IKEA cover, or US insert with US cover. Mixing costs more in frustration than either purchase saved.
- If you already own the IKEA insert, buy a US oversized queen cover rather than a standard queen. The extra length absorbs the mismatch better than the width does.
- If you already own the US insert, the IKEA cover is not salvageable at queen and above. Length cannot be added.
- Never buy an IKEA duvet for a US king bed. The 94.5 inch width leaves under 10 inches of drop per side.
- Check the unit before you check the number. A listing quoting centimeters on a US storefront is a European-spec product regardless of the size name in the title.
Red flags
- A third-party listing titled "fits IKEA" with no centimeter dimensions.
- "King" on a 240 × 220 cm product. Accurate in Europe, misleading in the US.
- Any US-size cover advertised as compatible with all European inserts.
- Duvet sets photographed on European beds. The drop shown will not reproduce on a US mattress.
Where to go next
Size-by-size dimensions on the twin, full, queen and king pages, or the whole sizes hub. Replacing the cover rather than the insert: best duvet covers and best duvet covers under $50. More sizing help in all guides.