Suit Size Estimator
Estimate your jacket and pant size based on your body metrics.
Regular / Average
Slim / Slender
Athletic / Muscular
Portly / Stout
Classic Fit (Comfortable)
Modern Fit (Trim)
Slim Fit (Tight)
Your Estimated Size
Jacket Size
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Jacket Length
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Pant Waist
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Note: This is an estimation based on standard anthropometric data. Suit sizes can vary by brand. For the absolute best fit, measuring your chest circumference with a tape measure is recommended.
How Suit Sizing Works
Finding the perfect suit starts with understanding the two main components of the sizing tag: the Chest Size (a number, e.g., 40, 42) and the Length (a letter, e.g., S, R, L).
Unlike casual clothing labeled S, M, or L, suits are measured in inches corresponding to the wearer's chest. This calculator estimates that measurement based on the correlation between your height, weight, and body composition.
Understanding the Length (S, R, L, XL)
The length of the jacket is determined primarily by your height. It ensures the jacket covers your torso correctly and the sleeves end at the wrist bone.
| Length Code | Term | Typical Height Range |
|---|---|---|
| S | Short | 5'4″ to 5'7″ |
| R | Regular | 5'8″ to 6'0″ |
| L | Long | 6'1″ to 6'3″ |
| XL | Extra Long | 6'4″ and taller |
The "Drop": Determining Pant Size
Most off-the-rack suits come with a standard "drop," which is the difference between the jacket size and the pant waist size. The industry standard is a 6-inch drop.
- Example: A size 40R jacket typically comes with size 34 pants (40 – 6 = 34).
- Athletic Builds: Often have a larger drop (e.g., 8 inches) because the chest is broad but the waist is narrow.
- Portly Builds: Often have a smaller drop (e.g., 2-4 inches) as the waist measurement is closer to the chest measurement.
Tips for the Perfect Fit
While this calculator provides a strong baseline, consider these factors when trying on a suit:
- Shoulders: The pads should end precisely at your shoulder bone. This is the hardest part to tailor, so get it right off the rack.
- Chest Button: When buttoned, the jacket should hug your midsection lightly without pulling (creating an 'X' shape) or hanging loosely.
- Sleeve Length: You should show about 1/4 to 1/2 inch of shirt cuff below the jacket sleeve.