Last reviewed on 2026-05-02.
What this site is
TheSize.net is an independent reference site that catalogues standard sizes, dimensions, and measurement systems for everyday products and materials. The catalogue spans furniture, bedding, paper, screens and electronics, clothing and footwear, jewelry, bags, sports gear, automotive components, construction materials, and a long list of household items in between.
The aim is narrow on purpose: tell the reader what the standard sizes are, where they came from, and how they relate to each other. The site does not sell products, take affiliate commissions on the page, or accept payment for placement in any guide.
Who it is for
The typical reader is someone in the middle of a decision. They are deciding between a King and a California King mattress, comparing TV sizes against a wall, checking whether a piece of luggage will pass airline carry-on rules, or looking up a tire code before ordering replacements. The size guides are written so that those readers can land on a page, find the dimension they need, and leave with the right answer.
Professional users also use the site as a quick lookup — designers checking ISO paper sizes, builders confirming standard door rough openings, and shoppers verifying clothing size charts across countries.
How content is produced
Each guide is built around the most widely recognized standard for its category. For paper, that is ISO 216 and the ANSI series. For mattresses, it is the North American sizing convention. For tires, it is the ISO metric tire code. Where multiple standards coexist, the page lists the major ones side by side so the reader can pick the relevant one.
Numbers are checked against published standards, manufacturer specification sheets, and trade associations. When a category does not have a single official standard — clothing being the most obvious example — the page is explicit about that and presents the most common conventions rather than implying one universal truth. Regional variations are called out where they materially affect the answer.
Editorial approach
Every guide follows the same structure: the standard sizes in a chart, an explanation of how those sizes are used, and practical notes on choosing between them. Pages avoid product recommendations and brand endorsements. Where a tip or rule of thumb is included — for example, "leave 24 to 36 inches of clearance behind a sofa" — it reflects general industry guidance rather than a proprietary opinion.
Calculators on category pages are simple, deterministic tools that run entirely in the browser. They do not collect any input. Their output is intended as a starting estimate, not a substitute for measuring the actual space.
Updates and corrections
Pages are reviewed periodically. When a standard changes — for example, when a new airline updates its carry-on dimensions — the related page is revised. Each substantive page carries a "Last reviewed" date so readers know when the content was last verified.
If you spot an error, please email corrections@thesize.net with the page URL and a brief description of what looks wrong. The more specific the report, the faster the fix.
Funding
The site is supported by display advertising. Ads are served by third parties — including, where applicable, Google AdSense — and may be personalized based on cookies. The advertising business does not influence which dimensions or standards appear in the size guides. See the privacy policy and cookie policy for details on how advertising and analytics cookies are used.
Get in touch
For general questions, suggestions for new size guides, or corrections, the contact page lists the relevant email addresses. Topic suggestions are especially welcome — they directly influence which categories get added next.