Clothing Size Calculator Formula
Understand the math behind the clothing size calculator. Each variable explained with a worked example.
Formulas Used
US Size (approximate)
us_size_out = us_sizeUK Size (approximate)
uk_size_out = us_size + 4EU Size (approximate)
eu_size_out = us_size + 30Variables
| Variable | Description | Default |
|---|---|---|
chest_inches | Chest Measurement(in) | 38 |
us_size | Derived value= round((chest_inches - 28) / 2) * 2 | calculated |
How It Works
How Clothing Sizes Relate to Measurements
Clothing sizes vary by brand, but approximate conversions exist between US, UK, and EU systems.
Approximate Conversions
US Size ~ (Chest - 28) / 2 (rounded to even)
UK Size ~ US Size + 4
EU Size ~ US Size + 30
Always check the specific brand size chart for accuracy.
Worked Example
Chest measurement of 38 inches.
chest_inches = 38
- 01US size = round((38 - 28) / 2) x 2 = 10
- 02UK size = 10 + 4 = 14
- 03EU size = 10 + 30 = 40
Ready to run the numbers?
Open Clothing Size Calculator