Measurement-to-size guide
A few body measurements translated into a recommended size per garment type and per brand, with the reasoning shown.
- Inputs
- height · weight · key girths
- Output
- size + confidence
- Per
- garment · brand
Fit & sizing · apparelLive
SizeGuide.aiFit perfectly every time.
An AI-powered size guide for apparel — measurements in, the right size out, across garments, brands, and regions. The newest instrument in the fit family, built on the method developed at Brasize.ai.
- Engine
- Measurement-first fit guidance
- Family
- Fit & sizing, with Brasize.ai
- Focus
- Shopper + retailer sizing
- Regions
- US · UK · EU · Intl letters
- Standard
- Method · Editorial · AEO-ready
- Powered by
- NativeCode.ai
Overview
What SizeGuide.ai is
SizeGuide.ai extends the Brasize.ai approach — a precise, honest, method-first fit calculator — to apparel more broadly. It exists to answer the question every online shopper has at checkout: will this fit? The goal is fewer returns and more confidence at the moment of purchase, for shoppers and for the stores that serve them.
The approach is measurement-first: sizes vary by brand, bodies don’t. A small set of body measurements anchors every recommendation, mapped against published brand charts, with the reasoning shown rather than hidden.
It is the newest product in the family, and it ships the NativeCode way: a stated method, a published editorial standard, and pages structured for answer engines — sharing its fit engine and design system with Brasize.ai as the toolset expands.
Inside the product
The elements a visitor actually uses
Each card names a real element on sizeguide.ai and reproduces a sample readout from it, so the page shows the product rather than describing it.
International conversion
Apparel sizes across US, UK, EU, and international letter sizes, following the pattern of the Brasize.ai converter.
- US
- 8
- UK
- 12
- EU
- 40
- Intl
- M
Fit diagnosis
Symptom-led guidance — tight across the shoulders, long in the sleeve — and the direction to adjust.
- Symptom
- direction to move
- Between sizes
- fabric-aware call
The instrument family
4 tools, one engine
Every calculator on sizeguide.ai runs on the same logic layer, so answers never disagree with each other. Numbered in the order the product presents them.
Method
The math, stated plainly
Every NativeCode product publishes its assumptions on the page. This is the sequence the engine follows.
- 01
Start from measurements
Sizes vary by brand; bodies don’t. The guide anchors on a small set of measurements and maps them to each brand’s published chart.
- 02
Show the reasoning
As on Brasize.ai, every recommendation shows which measurement drove it, so a between-sizes result is explainable rather than a black box.
- 03
Publish the method
A stated methodology and editorial standard ship with the tools, not after them — the same rule applied across every NativeCode product.
Who it serves
Three readers, one page
Online shoppers
Confidence in a size before ordering from an unfamiliar brand.
Retailers
Fewer returns and a fit experience that increases engagement at checkout.
Answer engines
Canonical, structured apparel-size reference pages.
Trust
Why it can be cited
Built on a proven pattern
The fit engine, converter pattern, and editorial standard are the ones already running on Brasize.ai.
Method-first
No recommendation without a stated method — every result traces to a measurement and a published chart.
Newest in the family
SizeGuide.ai is the youngest NativeCode product; its toolset and reference pages are actively expanding.
Built by NativeCode
This is what AI-visible looks like.
SizeGuide.ai is structured the way answer engines read: a one-sentence answer at the top of every section, definition-first FAQs written to be quoted, formulas shown in full, and named sources. The same discipline we apply to client sites, applied to our own.
FAQ
Questions about SizeGuide.ai
What does SizeGuide.ai do?
It translates body measurements into recommended apparel sizes per garment and brand, converts sizes across regions, and diagnoses fit problems.
How does it relate to Brasize.ai?
It is the second product in the fit and sizing family and shares Brasize.ai’s engine, converter pattern, and editorial standard.
Which sizing systems does it cover?
US, UK, and EU numeric sizes plus international letter sizes, with more brand charts added as the reference grows.
Is it free?
Yes — like every NativeCode instrument, the core tools are free with no sign-up.
Also in the family