Your chest measurement is the single most important number for suit jacket and dress shirt sizing. Learn the professional tailor-approved method to measure it accurately at home in under 2 minutes.
A chest measurement is the circumference of your torso taken at the fullest part of your chest, across the nipple line. The measuring tape wraps all the way around your body, passing under your armpits and across your shoulder blades at the back.
This measurement is the foundation of suit jacket, blazer, sport coat, and dress shirt sizing. When you see a suit labeled "42R," that number refers to the jacket size, which is derived from the chest measurement. Your actual chest measurement and your jacket size are not the same number -- the jacket includes extra inches called "ease" to allow for comfortable movement and layering.
Whether you're ordering a custom suit from Nathan Tailors in Hoi An or buying off-the-rack, knowing your true chest measurement is the first step to getting clothes that actually fit.
Your chest measurement is the actual circumference of your body. Your jacket size is typically 2-4 inches larger than your chest measurement. This extra room is called "ease" and allows for comfortable movement, breathing, and layering a dress shirt underneath.
For example, if your chest measures 40 inches, you would typically wear a size 42 jacket in standard fit, or a size 41-42 in a slim fit. Custom tailors like Nathan Tailors measure your actual chest and then add the right amount of ease based on your preferred fit style.
The drop measurement is your chest measurement minus your waist measurement. A 6-inch drop (e.g., 42" chest, 36" waist) is considered "athletic," while a 4-inch drop is "regular." This number tells a tailor how much the jacket should taper through the midsection. A higher drop means a more tapered, fitted silhouette.
Stand up straight in a natural, relaxed posture. Let your arms hang naturally at your sides. Do not puff out your chest, flex your muscles, or hold your breath. Wear a thin, fitted t-shirt or no shirt at all -- never measure over a thick sweater, hoodie, or jacket.
Pro tip: Breathe normally throughout the entire measurement process. If you hold your breath or inhale deeply, your chest expands and you'll get an artificially large measurement that leads to an ill-fitting jacket.
Wrap the measuring tape around the fullest part of your chest, across the nipple line. The tape should pass under your armpits and across your shoulder blades at the back. Keep the tape parallel to the floor all the way around -- if the tape rides up at the back or dips down, your measurement will be off.
Check with a mirror: Use a mirror to verify the tape is level at the back. A common mistake is letting the tape ride up between the shoulder blades, which gives a smaller measurement than your true chest size.
While breathing normally, read the number where the tape overlaps the starting end. The tape should be snug but not compressing your skin or flesh. A good test: you should be able to slip one finger between the tape and your chest. If the tape digs in, it's too tight. If you can fit your whole hand underneath, it's too loose.
Record the measurement in inches or centimeters. Measure twice and take the average for the most accurate result. If measuring alone, hold both ends of the tape at the front of your chest where you can read the numbers.
Pro tip: If your measurement falls between two whole numbers (e.g., between 40" and 41"), record the half-inch. Custom tailoring accommodates exact measurements, so 40.5" is more useful than rounding up or down.
Use this reference table to see if your measurement is in the typical range for your height. These are averages for men with a regular build -- athletic or stocky builds will naturally measure larger.
| Height | Typical Chest (inches) | Typical Chest (cm) | Likely Jacket Size |
|---|---|---|---|
| 5'6" (168 cm) | 36" - 38" | 91 - 97 cm | 38 - 40 |
| 5'8" (173 cm) | 38" - 40" | 97 - 102 cm | 40 - 42 |
| 5'10" (178 cm) | 40" - 42" | 102 - 107 cm | 42 - 44 |
| 6'0" (183 cm) | 42" - 44" | 107 - 112 cm | 44 - 46 |
| 6'2" (188 cm) | 44" - 46" | 112 - 117 cm | 46 - 48 |
This inflates your measurement by 1-3 inches and will result in a jacket that's too loose. Breathe normally and stand in a relaxed, natural posture throughout the measurement.
A sweater or padded jacket can add 1-3 inches of error. Always measure over a thin t-shirt or bare skin for an accurate number.
If the tape rides up between your shoulder blades or dips below your chest, you'll get an inaccurate reading. Use a mirror or ask someone to help verify the tape is level all the way around.
A tape that digs into your skin gives a falsely small measurement. The tape should be snug but you should be able to slip one finger underneath it comfortably.
The chest measurement is taken at the fullest part of the chest, across the nipple line -- not at the collarbone or at the bottom of the ribcage. Measuring at the wrong height can be off by 2-4 inches.
A chest measurement is the circumference of your torso at the fullest part of your chest, taken across the nipple line. The tape passes under the armpits and over the shoulder blades at the back. It is the single most important measurement for fitting a suit jacket, blazer, sport coat, or dress shirt. All standard jacket sizing (36, 38, 40, 42, etc.) is based on this measurement plus ease for comfort.
Stand with your arms relaxed at your sides and wrap a flexible measuring tape around the fullest part of your chest, across the nipple line. Keep the tape parallel to the floor. Breathe normally and read the measurement where the tape overlaps. For suit jacket sizing, add 2-4 inches to your actual chest measurement. A 40-inch chest typically wears a size 42 jacket in standard fit, or size 41-42 in a slim fit. At Nathan Tailors, we take your exact measurement and add the right amount of ease for your preferred fit style.
The average chest size for men is 38-42 inches (97-107 cm), depending on height and build. Men at 5'8" typically measure 38-40 inches, men at 5'10" measure 40-42 inches, and men at 6'0" measure 42-44 inches. Athletic or muscular builds tend to be 2-4 inches larger than average for their height. These are general guidelines -- always measure yourself for accurate sizing, especially for custom tailoring.
For the most accurate result, measure over a thin, fitted t-shirt or bare skin. Never measure over a thick sweater, hoodie, or jacket -- these can add 1-3 inches of error. If you plan to wear a dress shirt under your suit jacket, measuring over a thin t-shirt actually approximates that layering nicely. The key is consistency: if you measured over a t-shirt, tell your tailor so they can account for it.
The tape should be snug but not compressing your body. The one-finger test is the gold standard: you should be able to slip one finger between the tape and your chest. If the tape digs into your skin, it's too tight and will give a falsely small measurement. If the tape sags or hangs loosely, it's too loose and will give a falsely large measurement. Both errors lead to a poorly fitting jacket.
The drop measurement is your chest measurement minus your waist measurement. It tells a tailor how much the jacket should taper from the chest to the waist. A 6-inch drop (e.g., 42" chest, 36" waist) is considered "athletic" and produces a noticeably tapered silhouette. A 4-inch drop is "regular" or "standard." A 2-inch drop or less is "portly" or "executive" fit. Off-the-rack suits are typically cut for a 6-inch drop, which is why they don't fit everyone. Custom tailoring from Nathan Tailors accounts for your exact drop measurement, so the jacket follows the natural contours of your body.
Now that you know your chest measurement, save it with Nathan Tailors and get a perfectly fitted custom suit, jacket, or dress shirt tailored in Hoi An, Vietnam. Every garment is made to your exact measurements.
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