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Mattress sizes

Different counties have their own standard mattress sizes. Manufacturers even within one country might have measurements of particular brand mattresses defined by its unique specifications. No matter whether it is metric or imperial system actual sizes of a few mattresses might differ in width and length up to 1 inch or 1 centimeter even if the products defined into the same category.

Standard mattress dimensions chart (US, Canada)

Mattress type
Width
Length
Dimensions
Space area
Proportions
Twin
39 in
75 in
39 x 75 in
2,925 in²
twin-mattress-sizes
99.1 cm
190.5 cm
99.1 cm x 190.5 cm
18,878 cm²
Extra Long Twin XL
39 in
80 in
39 x 80 in
3,120 in²
extra-long-twin-mattress-dimensions
99.1 cm
203.2 cm
99.1 x 203.2 cm
20,137 cm²
Full (Double)
54 in
75 in
54 x 75 in
4,050 in²
full-double-mattress-sizes
137.2 cm
190.5 cm
137.2 x 190.5 cm
26,137 cm²
Extra Long Full (Double) XL
54 in
80 in
54 x 80 in
4,320 in²
extra-long-full-double-mattress-dimensions
137.2 cm
203.2 cm
137.2 x 203.2 cm
27,879 cm²
Queen
60 in
80 in
60 x 80 in
4,800 in²
queen-mattress-sizes
152.4 cm
203.2 cm
152.4 x 203.2 cm
30,968 cm²
King
76 in
80 in
76 x 80 in
6,080 in²
king-mattress-sizes
193.0 cm
203.2 cm
193.0 x 203.2 cm
39,218 cm²
California King
72 in
84 in
72 x 84 in
6,048 in²
california-king-mattress-dimensions
182.9 cm
213.4 cm
182.9 x 213.4 cm
39,031 cm²

First row in each mattress category measurements of mattress sizes in imperial system - length and width in inches (in), area space in square inches (in²)
Second row is mattress sizes in metric system – length and width in centimeters (cm), area space in square centimeters (cm²).

There are mattresses like three quarter with dimensions 48” x 75”, or Olympic queen mattress (extended queen) with actual measurements 66’ x 80” discontinued from production and many stores do not carry these sizes any more.

All images are resized proportionally to the height of a human body and actual mattress dimensions.
- Average male heights 5’ 10” or 1.778 meter (177.8 cm)
- Average female heights 5’ 4 ½" or 1.638 meter (163.8 cm) were considering as a standards.
26” x 20” (app. 66 x 51 centimeters) pillow size was taken as a standard for mattresses dimensional proportions comparison.

Mattress sizes comparison chart by space area

Type of mattress
Space area
Changing in size
Twin mattress
2,925 in²
in²
%
18,878 cm²
cm²
Extra Long Twin XL mattress
3,120 in²
+195 in²
+7%
20,137 cm²
+1,259 cm²
Full (Double) mattress
4,050 in²
+930 in²
+30%
26,137 cm²
+6,000 cm²
Extra Long Full (Double) XL mattress
4,320 in²
+270 in²
+7%
27,879 cm²
+1,742 cm²
Queen mattress
4,800 in²
+480 in²
+11%
30,968 cm²
+3,089 cm²
King mattress
6,080 in²
+1280 in²
+27%
39,218 cm²
+8,250 cm²
California King mattress
6,048 in²
-32 in²
-1%
39,031 cm²
-187 cm²

Changing in sizes indicates how mattress dimensions increasing or decreasing comparing to previous size.

UK mattresses dimensions chart

Mattresses
Imperial sizes
Metric sizes
Space area in²/cm²
Increasing in size
Small single
2'6" x 6'3"
75 x 190 cm
2,250/14,250
in²
cm²
%
Single
3'0" x 6'3"
90 x 190 cm
2,700/17,100
+450
+2,850
+20%
Small double
4'0" x 6'3"
120 x 190 cm
3,600/22,800
+900
+5,700
+33%
Double
4'6" x 6'3"
135 x 190 cm
4,050/25,650
+450
+2,850
+13%
King size
5'0" x 6'6"
150 x 200 cm
4,680/30,000
+630
+4,350
+16%
Superking
6'0" x 6'6"
180 x 200 cm
5,616/36,000
+936
+6,000
+20%

How thick is mattress

Thickness of a mattress may range from 5” to 20” and will depend on the amount of layers and type of a mattress. Typically 12 – 14 gauge coil inner springs quality mattress will be 9” – 16” high plus couple inches thick pillow top for comfort. Memory foam mattress topper usually 1 – 4 inches (2.54 – 10.16 cm) in thickness.

Foam mattress is a combination of foam layers with density from 3 lb/cu ft (48 kg/m³) to 7 and 1.5” – 4” in thickness each. Quality foam mattresses are usually 10” - 14” thick. Total heights of mattress might vary from 10” including low profile foundation to 30” with a high foundation.

Shipping dimensions

Traditional mattresses typically shipped in plastic what will not add any extra inches. Many memory foam mattresses might be rolled and placed into cartons for shipment which vary in dimensions accordingly to the mattress size. Some products might be even compressed to fit into smaller 18”, 24” or 48” boxes. Also some mattresses might have special requirements and cannot be transported vertically but only in horizontal position.

How heavy is mattress

Twin size mattress might be as light as 30 lb or as heavy as 60 lb depending on a type of a mattress. The weight increase proportionally with increasing the mattress dimensions. Some king size mattresses can easily weight 150 – 180 pound or 68 – 82 kilograms with a typical 70 – 120 lb of foundation.

Which size of a mattress is the best choice

Consider numerous of factors while shopping for a new mattress. Analyze not only mattress dimensions but room size as well. If the bedroom is smaller than 10’ x 11’ huge 6’ 4” wide and 6’ 8” long king mattress will eliminate nearly 39% of a bedroom space making it hard to fit any other furniture. Longer sizes preferably for taller people.