A better fit starts with a few measurements
Choose the space you sleep in.
A mattress needs to fit your frame, your room and the way you sleep. Compare the footprints below, then check the exact dimensions of the model you want.
Find your fit, at a glance.
See the difference in size
Mattress drawings use the same scale within each row. Measurements are width × length; bed frames extend beyond the mattress.
Twin / Single
38 × 75 in96.5 × 190.5 cm
A compact choice for one sleeper.
Double / Full
54 × 75 in137.2 × 190.5 cm
More width for stretching out.
Queen
60 × 80 in152.4 × 203.2 cm
A versatile size for a shared bed.
King
76 × 80 in193.0 × 203.2 cm
The widest single mattress shown.
More length & split options
Twin XL
38 × 80 in96.5 × 203.2 cm
Twin width with 5 inches more length.
California King
72 × 84 in182.9 × 213.4 cm
Extra length with a narrower footprint than King.
Split King
76 × 80 in193.0 × 203.2 cm
Two 38 × 80-inch Twin XL mattresses side by side.
Dimensions are a comparison reference, not a specification for every product. Specialty sizes are shown for comparison and may require a custom order.
The numbers, at a glance
Mattress dimensions
| Size | Inches | Centimetres |
|---|---|---|
| Twin / Single | 38 × 75 | 96.5 × 190.5 |
| Double / Full | 54 × 75 | 137.2 × 190.5 |
| Queen | 60 × 80 | 152.4 × 203.2 |
| King | 76 × 80 | 193.0 × 203.2 |
| Twin XL | 38 × 80 | 96.5 × 203.2 |
| California King | 72 × 84 | 182.9 × 213.4 |
| Split King | 76 × 80 | 193.0 × 203.2 |
Centimetres are converted from the inch measurements and rounded to one decimal place. Confirm the selected product’s dimensions and tolerance before ordering.
Start with your priorities
What does a better fit mean for you?
Keep more of the room
Compare Twin and Double when you want a smaller bed footprint. Think about where a desk, dresser or bedside table will go, and how much sleeping space feels comfortable.
Make room for two
Compare Queen and King. The King shown here adds 16 inches across without adding length. Mark out both footprints to see what that extra width changes in your room.
Look for more length
Twin XL adds 5 inches to the length of Twin in this chart. California King offers more length than King while using less width. Check frame compatibility first.
Two useful comparisons
Width and length solve different problems.
Double → Queen
+6″ wide +5″ longMore room across and from head to foot.
Queen → King
+16″ wide same lengthExtra width for a shared sleeping space.
Comparisons use the dimensions in this guide.
A quick check before checkout
Measure more than the mattress.
The frame
Measure the usable mattress space inside the frame and check the frame maker’s size and support requirements. For a new bed, check its outside dimensions too: upholstery, headboards and footboards take extra room.
The room in use
Mark the full bed outline on the floor with removable tape. Walk around it, open wardrobe doors and pull out drawers. Leave the clearance you need for comfortable access rather than relying on a room-size label.
The height
Add the frame, base, mattress and any topper to understand the total bed height. Check sheet pocket depth. For bunk or loft beds, follow the bed maker’s mattress-size and maximum-thickness instructions.
The way into the room
Check doorways, stair turns and elevators against the packaged product dimensions. A mattress, a rigid base and an assembled frame can have different delivery requirements.
Useful answers
Mattress size questions
What do the two measurements mean?
The first number is the width across the mattress. The second is the length from head to foot. Mattress height, or thickness, is a separate measurement.
Why do some listings show slightly different dimensions?
Size names are categories, not a guarantee of an exact measurement. Brands and models may use different nominal dimensions or manufacturing tolerances. Match the product’s stated measurements to your bed frame before ordering.
Are Single and Twin the same?
Single and Twin usually refer to the same size category. Twin XL is longer, so check the full name and dimensions when buying a mattress, base or fitted sheet.
Are Double and Full the same?
Double and Full are two names for the same size category. Use the exact measurements of the selected model when matching an existing frame.
What changes when I move from Double to Queen?
Using this chart, Queen adds 6 inches of width and 5 inches of length over Double. Compare both the sleeping space and the space left around the bed.
Do two Twins make a King?
Two Twins from this chart make a combined 76 × 75-inch footprint, which is 5 inches shorter than the King shown. Two Twin XLs make 76 × 80 inches overall. Check the individual mattresses and the base; the two mattresses still have a seam between them.
Is California King the largest option?
It is the longest size shown here, but it is not the widest. California King is 4 inches narrower and 4 inches longer than King in this chart. Their frames and fitted sheets are not interchangeable.
What is a Split King?
A Split King combines two Twin XL mattresses, each 38 × 80 inches, for a 76 × 80-inch overall footprint. The centre seam remains. Check that the mattresses and bases are compatible with your intended setup.
Does this chart mean every size is in stock?
No. The chart is a sizing reference. Availability, thickness and exact measurements depend on the product. Check the listing or contact us about specialty and custom sizes.
How do I choose the right fitted sheet?
Match the width and length first, then check the sheet’s pocket depth against the mattress height and any topper. A sheet marked Queen can still be too shallow for a tall mattress.