๐ Fashion & Sizing
Jacket Size Calculator
Menswear jacket sizes are quoted as chest circumference in inches, so a 40R is a 40 inch chest in a regular length. The letter after the number is drop โ how much narrower the waist is โ which is why two jackets with the same number can fit very differently.
How it works
Chest measurement
Your height
Measurement unit
Fit type
Jacket size
Length code
Letter size
Typical sleeve length
Frequently asked questions
How do I use the Jacket Size Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.