About TheSize.net

Who we are

TheSize.net is run by a small, independent editorial team. Guides are published under the byline "TheSize Editorial Team" because each one is researched, written and checked as a shared reference work rather than as one person's opinion. We are not owned by a manufacturer or retailer, and we do not sell products.

The site answers one kind of question: how big something is, and whether it will fit. Readers arrive from a search such as "65 inch TV dimensions" or "A4 size in inches" and need a correct number quickly, followed by enough context to make a decision.

What we cover

The guides are grouped into sections: screens and electronics, paper and print, home and furniture, bed and bath, kitchen and appliances, clothing and shoes, jewelry and accessories, bags and travel, outdoor and garden, sports and fitness, baby and kids, pets, building and DIY, cars and vehicles, and music and hobbies. The full directory lists every guide by section.

Alongside the guides we publish reference tools: a unit converter, a size comparison tool, a dimensional weight calculator and a reference to the size standards that most of our figures depend on.

Where our numbers come from

Each figure on the site comes from one of four kinds of source, in this order of preference:

1. Published standards. When a size is defined by a standard, we use the standard: ISO 216 for paper, ANSI/ASME Y14.1 for US drawing sheets, ISO/IEC 7810 for cards, ISO 668 for shipping containers, the American Softwood Lumber Standard (PS 20) for lumber, ASTM specifications for brick and block.
2. Laws and regulations. Safety dimensions, such as full-size crib slat spacing (16 CFR 1219) or stair riser limits in the International Residential Code, come from the regulation itself. Rules that change, such as airline carry-on limits or carrier shipping divisors, are dated "as of" the year we checked them.
3. Manufacturer specifications. For products such as TVs, laptops, appliances and furniture, we use the dimensions manufacturers publish on their spec sheets and support pages. We name specific models only when we have confirmed their published figures.
4. Industry conventions. Some sizes, like mattress sizes in the US, are trade norms with no binding standard. We say so on the page and give the conventional figure along with how much products typically vary.

Each guide lists its main sources in a "Sources and methodology" box at the end. We do not invent tests, surveys, experts or statistics, and we do not present a typical value as if we had measured it ourselves.

How we convert and round

• Exact factors. Conversions use the legal definitions: 1 inch = 2.54 cm, 1 foot = 30.48 cm, 1 pound = 0.45359237 kg, 1 US gallon = 3.785411784 liters. We compute every conversion rather than copying it from another site.
• Round once, at the end. We convert from the defining value and then round, so a figure is never the result of rounding twice. A4 is defined as 210 × 297 mm, so 8.27 × 11.69 in comes straight from those numbers.
• Practical precision. Furniture and rooms are rounded to the nearest 0.5 in or 1 cm, screens and paper to 0.1 in or 1 mm, and small parts such as screws and drill bits to 0.01 in or 0.1 mm. Where a standard gives a tolerance, we show the nominal figure and mention the tolerance if it matters.
• Native units first. US-market products and sizes lead with inches; ISO and metric-native sizes lead with millimeters or centimeters. Both always appear.
• Screen geometry by formula. Screen width and height are calculated from the diagonal and aspect ratio (for 16:9, width = 0.8716 × diagonal and height = 0.4903 × diagonal), then checked against manufacturer figures.

How we build size ranges

Many products have no single correct size: two 65-inch TVs or two queen bed frames can differ by several inches. In those cases we give a range taken from current models of the major brands in that category and state what drives the variation (bezel width, stand design, upholstery thickness). Where one figure matters more than the others, such as the fixed screen size of a TV or the cutout width an appliance needs, we give it exactly and keep ranges for the parts that vary.

For sizes that brands set themselves, such as clothing, shoes and rings, we give the standard or the most common chart, and say how far brands typically depart from it. Our advice in those guides is always to check the specific brand's chart before buying.

Updates and review

Each guide shows the date it was last updated. We review pages when a standard is revised, a regulation or carrier rule changes, a manufacturer redesigns a product line, or a reader reports a problem. High-traffic guides and pages with time-sensitive rules, such as carry-on limits and shipping divisors, are checked more often than pages built on stable standards like paper sizes.

Corrections policy

If a figure is wrong, we want to know. Email corrections@thesize.net with the page address, the figure in question and, if you have one, the source that shows the correct value (a standard, a spec sheet or a regulation). We check every report against the source. When a correction is confirmed, we fix the page and update its date. We do not silently change safety-related figures: if a correction affects safety advice, the page says what changed.

How the site is funded

TheSize.net is free to read and is supported by display advertising served by third-party ad networks. Advertising pays for research and hosting. It does not influence content:

• Advertisers have no say over which products, brands or sizes we cover, or what we write about them.
• We do not accept payment for placement, reviews or mentions in a guide, and we do not publish sponsored content.
• Measurements are never adjusted to favor a product or brand.
• Ads are visually separate from editorial content and are not presented as guides.

How advertising and analytics use cookies is explained in our privacy policy and cookie policy.

What the site is not

Our guides are general reference information. They are not engineering, medical, legal or building-code advice. For anything where a small error matters, such as a built-in appliance cutout, a structural span or a child safety product, confirm the measurement with the manufacturer, the governing standard or a qualified professional before you buy or build. The terms of use set this out in full.

Contact

General questions and suggestions for new guides: contact@thesize.net. Errors in figures: corrections@thesize.net. Privacy requests: privacy@thesize.net. More detail is on the contact page.