Measurement & Accuracy Policy
Size Guide Hub publishes practical size and dimension guides for everyday products and spaces. This policy explains how we handle measurements, conversions, country differences, rounding, sources and corrections.
Last updated: 9 October 2026
1. Our Accuracy Goal
Our goal is to present measurements clearly, accurately and in a way that is useful for real-world planning.
We aim to distinguish between exact specifications, recognised standard sizes, common market sizes and approximate measurements.
2. Types of Measurements We Publish
3. Preferred Measurement Sources
The most appropriate source depends on the topic. Where available, we aim to prioritise reliable first-party or authoritative information.
Sources may include:
- Official manufacturer specifications.
- Product manuals and technical documents.
- Recognised standards organisations.
- Government or public authority documents.
- Official building or industry guidance.
- Established specialist industry references.
- Multiple reliable sources when no single standard exists.
4. Exact, Standard, Typical and Approximate
These terms have different meanings in our guides.
| Term | How We Use It |
|---|---|
| Exact | A specific measurement supported by a clear product specification, technical document or recognised standard. |
| Standard | A recognised or widely accepted size. A standard size may still have tolerances or regional differences. |
| Typical | A commonly found measurement that should not be assumed to apply to every item. |
| Approximate | A rounded or estimated figure used for general understanding rather than precision work. |
5. Country Differences
Size names are not always international standards.
A queen, king, double or single mattress can have different dimensions depending on the country. Door sizes, garage dimensions, furniture sizing and construction practices can also vary.
Our main audience includes readers in:
- United States.
- United Kingdom.
- Canada.
- Australia.
When country differences materially affect the answer, we aim to label measurements by country instead of combining them into one universal figure.
6. Imperial and Metric Units
Size Guide Hub may display measurements in both imperial and metric units to serve readers in different countries.
Common units include:
- Inches (in).
- Feet (ft).
- Millimetres (mm).
- Centimetres (cm).
- Metres (m).
Where practical, an article may show the original measurement first and converted values alongside it.
7. Conversion Standards
Basic conversions are based on standard mathematical relationships.
| Conversion | Value |
|---|---|
| 1 inch | 25.4 millimetres |
| 1 inch | 2.54 centimetres |
| 1 foot | 12 inches |
| 1 foot | 30.48 centimetres |
| 1 metre | 100 centimetres |
| 1 metre | 1,000 millimetres |
8. Rounding Policy
Converted measurements may create long decimal values. For readability, we may round converted values where the extra precision would not materially help the reader.
For example, a measurement originally supplied in inches may be shown as a rounded centimetre value.
9. Measurement Tolerances
Some manufactured products have allowable tolerances. This means an actual product may be slightly larger or smaller than its nominal published size.
Soft products such as mattresses, rugs and textiles may also vary due to materials, manufacturing methods and compression.
Where a tolerance is important and reliable information is available, we aim to mention it.
10. Furniture and Product Measurements
Furniture dimensions are highly manufacturer-specific.
A dining table described as suitable for six people, for example, does not have one universal length or width.
Articles about furniture may therefore show common size ranges, practical spacing guidance or example dimensions rather than claiming one exact standard.
11. Room and Garage Dimensions
Room and garage size guides often describe typical or practical dimensions, rather than legally required dimensions.
Building requirements can vary by jurisdiction, property type and intended use.
Where a measurement relates to building regulations, accessibility, structural requirements or safety, readers should verify the applicable local requirements.
12. Clearance Recommendations
Some guides provide suggested clearance around beds, tables, doors, furniture or other items.
These figures may be practical planning recommendations rather than fixed standards.
Personal mobility needs, accessibility requirements, room shape and furniture design can affect the amount of clearance required.
13. Calculators
Size Guide Hub may provide calculators for measurements, size comparisons, curtains, rugs, room planning or unit conversions.
Calculator results depend on the information entered by the user and the formula used.
Results should be treated as practical planning estimates unless the calculator clearly states that it reproduces a defined standard.
14. Diagrams and Illustrations
Some guides may use diagrams, illustrations or visual size comparisons.
Unless explicitly stated otherwise, these visuals are intended to explain measurements and may not be drawn to exact scale.
15. Product Changes
Manufacturers can change product dimensions without maintaining the same specifications forever.
Different model years, regional versions and product revisions can also have different measurements.
For an exact purchase decision, readers should always check the current product listing, manual or manufacturer’s technical information.
16. How We Handle Conflicting Measurements
Sometimes reliable sources publish different measurements for what appears to be the same size or product category.
When this happens, we may:
- Check whether the sources refer to different countries.
- Check whether one figure includes a frame and another does not.
- Look for model or manufacturer differences.
- Identify whether values were rounded.
- Compare additional reliable references.
- Explain the difference in the article when it matters.
17. Corrections
If a measurement is found to be materially incorrect, we aim to review and correct it.
Readers can report possible measurement errors by emailing: [email protected] .
Please include the page URL, the measurement in question and a reliable reference where possible.
18. Review and Updates
Not every measurement changes frequently. However, we may review important guides when:
- A product specification changes.
- A source becomes outdated.
- A standard is revised.
- A country-specific difference needs clarification.
- A reader identifies a possible error.
- Better first-party information becomes available.
19. What Readers Should Do Before Buying
Our guides are designed to help with research and planning. Before making a purchase where fit matters, we recommend:
- Measure the actual available space.
- Check doorways, stairs and access routes.
- Check the current manufacturer dimensions.
- Allow appropriate clearance.
- Confirm whether dimensions include frames, handles or other parts.
- Check the retailer’s current product specification.
20. What Readers Should Do Before Building or Installing
Building, fitting and installation projects require greater precision than general reference guides.
Verify actual dimensions, manufacturer instructions, local requirements and professional specifications before beginning work.
21. Our Accuracy Commitment
22. Contact Us
Questions about a measurement or accuracy issue can be sent to: