Bed Size Lab

US size atlas

United States bed and mattress sizes

The US atlas includes six widely sold standard mattresses plus five source-backed specialty records. Exact dimensions—not the label alone—are the reliable way to compare fit.

Local sizeCentimetersInchesTypeSource status
TwinSingle96.5 × 190.538 × 75market conventionminor variation
Twin XLTwin Extra Long, Twin Long96.5 × 203.238 × 80market conventionagrees
FullDouble134.6 × 190.553 × 75market conventionminor variation
QueenNo common alias recorded152.4 × 203.260 × 80market conventionagrees
KingEastern King193 × 203.276 × 80market conventionagrees
California KingCal King, Western King182.9 × 213.472 × 84market conventionagrees
Full XLFull Extra Long, Double XL137.2 × 203.254 × 80market conventionminor variation
Split KingTwo Twin XL mattresses193 × 203.276 × 80market conventionagrees
Olympic QueenExpanded Queen167.6 × 203.266 × 80market conventionagrees
Wyoming King84-inch square bed213.4 × 213.484 × 84market conventionsingle-source
Alaskan King108-inch square bed274.3 × 274.3108 × 108market conventionagrees
Regional labels still vary.

Retailers can round metric conversions, offer special sizes, or use the same label for multiple lengths. Measure the actual mattress, bed frame, and bedding before purchasing.

US measurement library

Plan the mattress, support, frame, and bedding together

Headboard dimensionsBed skirt sizesMattress thicknessOversized mattressesBox spring sizesBed frame dimensionsSheet sizesRV mattress sizesTwin vs Full

International comparison

Closest does not mean interchangeable.

The nearest equivalent is calculated from width and length differences. Bedding compatibility also depends on mattress depth, product tolerances, cover construction, and the amount of drop or tuck you want.

Use the international converter to compare these records against every other country in the dataset.

Sources for this page