Clothing Letter Size Range Estimator
View the modelled chest and waist measurement ranges for a selected letter size.
Last updated · View algorithm, constants and default inputs (JSON)
This page shows illustrative chest and waist intervals generated from a simple letter-size model. It does not convert to US or EU numeric sizes and is not a brand chart. Measurements are in inches; compare your actual measurements with the maker’s garment chart.
About this calculator
This page shows illustrative chest and waist intervals generated from a simple letter-size model. It does not convert to US or EU numeric sizes and is not a brand chart. Measurements are in inches; compare your actual measurements with the maker’s garment chart.
Choose the calculation that matches your task
Choose a letter size here to see illustrative chest and waist intervals from the stated model. This is not a numeric US, UK or EU label converter. For an existing women’s numeric label, open the separate reference crosswalk and check its brand-specific basis.
Worked example
calculated with the default values below
Letter size M · Sizing profile Women's reference Chest/bust range 36 – 38 in · Waist range 30 – 32 in · Chest/bust range: lower (in) 36 in · Chest/bust range: upper (in) 38 in · Waist range: lower (in) 30 in · Waist range: upper (in) 32 in
General background references
Disclaimer
These calculators give general estimates. Sizing, pricing, availability and standards vary by brand, retailer and country, so treat the output as a starting point and confirm it against the seller's or authority's own figures.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
chestMin = b + i·s; chestMax = b + (i+1)·s; waistMin = chestMin − o; waistMax = chestMax − o
- i
- Letter-size index (XS = 0…3XL = 6)
- b
- Chest baseline (32 women, 34 men; model inputs)
- s
- Step (2 women, 1.5 men; model inputs)
- o
- Waist offset (6 women, 4 men; model inputs)
- chestMin
- Lower chest/bust range (in)
- chestMax
- Upper chest/bust range (in)
- waistMin
- Lower waist range (in)
- waistMax
- Upper waist range (in)
The fixed baselines and increments are illustrative model inputs, not a standard brand conversion. All four displayed ranges are in inches.
Frequently asked questions
How are the clothing measurement ranges generated?
The page applies fixed starting values and increments for each selected letter and profile. It displays modelled chest/bust and waist intervals in inches only. Those values are not a brand chart or a numeric US/EU conversion.