Canonical data model
Every record stores a stable ID, market, name, aliases, native statement, canonical millimetres, dimension type, tolerance, sources, checked date, confidence and related routes.
Market-first naming
Every ambiguous name keeps a market code. Selectors, tables, breadcrumbs and answers do not present “King” or “Queen” as a universal standard.
Exact conversion
Dimensions are stored once in millimetres. Inches use exactly 25.4 mm and centimetres use 10 mm; a rounded display is never converted back.
Nominal and manufacturer figures
A convention is distinguished from a finished manufacturer example. The page identifies the evidence type instead of presenting every number as universal law.
Conflict and tolerance handling
When credible Australian sources disagree, BedMetric keeps the range visible and identifies which example drives the proportional drawing.
Bounded publication
Only records and comparisons with a distinct decision task become routes. Unit states, spellings and arbitrary pairs remain non-indexable.
Source hierarchy and review
Authoritative and independent sources are preferred where available, followed by national retailers and manufacturers for current market practice and finished examples. Links are checked every six months; the complete fact set is reviewed annually or sooner after a credible correction.
Better Sleep Council
Mattress SizesChecked 27 August 2026. Minimum factual dimensions only; original wording, tables and visuals.
Dreams
The bed and mattress size guideChecked 27 August 2026. Retailer evidence used for dimensions and naming only.
Which?
UK bed sizes: bed and mattress size guideChecked 27 August 2026. Independent corroboration; no protected prose, tables or imagery reproduced.
IKEA Canada
Mattress guideChecked 27 August 2026. Canadian retailer evidence; manufacturer presentation not reproduced.
Sealy Canada
Frequently asked questionsChecked 27 August 2026. Finished-product examples and stated ±½–1 inch model variation only.
Sealy Australia
Bed and mattress size guideChecked 27 August 2026. Manufacturer examples and ±15 mm handmade tolerance kept in their stated scope.
Forty Winks
Australian bed size guideChecked 27 August 2026. National retailer corroboration; differing figures retained as a range.
Google Search Central
Spam policies for Google web searchChecked 27 August 2026. Current policy control for page-value and scaled-content review.
Google AdSense
Google Publisher PoliciesChecked 27 August 2026. Current policy control; advertising remains inactive.
What BedMetric does not claim
Nominal dimensions are not compatibility certifications, manufacturing guarantees, comfort recommendations, medical advice or proof that bedding will fit. BedMetric does not claim affiliation with any listed source.
Editorial accountability
Report a factual correction · Read the full editorial policy · Apply the measurement method · Use the bounded comparator