How to Measure Sleeve Length

Learn how to measure sleeve length correctly for shirts, dress shirts, and jackets. This guide covers the right starting point, posture, and tips for measuring alone or with help.

Getting sleeve length right makes a bigger difference to how a garment fits than most people realize. Sleeves that are too short look off immediately, and sleeves that are too long bunch up at the wrist and ruin an otherwise good fit. If you are shopping online, ordering a custom shirt, or buying a dress shirt for a formal occasion, knowing how to measure sleeve length accurately saves you from returns and alterations. This guide covers the correct method for measuring sleeve length on your body and on a garment.

What You Need

A flexible measuring tape (the kind used for sewing, not a rigid one)
A friend to help, if possible (measurements are more accurate with two people)
A shirt or jacket to wear as a reference point, if measuring on the body

How to Measure Sleeve Length on Your Body

This is the measurement you need when buying shirts, suits, or jackets online or from a tailor.

Stand with your arm slightly bent. Bend your elbow at about a 30-degree angle and rest your hand on your hip. This is the natural relaxed position of your arm when wearing a garment. Do not extend your arm straight out.
Find the starting point. The measurement starts at the center back of your neck, at the base of your skull where your neck meets your shoulders.
Run the tape across your shoulder. From the center back of your neck, bring the tape across the top of your shoulder to the shoulder seam point. This is the bony point where your shoulder ends and your arm begins.
Continue down to your wrist. From the shoulder point, run the tape down the outside of your arm, following the slight bend of your elbow, to your wrist bone. The wrist bone is the small bony bump on the outside of your wrist.
Record the measurement. This full measurement from center back neck to wrist bone is your sleeve length.

A typical men’s sleeve length falls between 32 and 37 inches. Most dress shirts list sleeve length alongside neck size, so you will see sizes written as 15.5/34 or 16/35 (neck/sleeve).

How to Measure Sleeve Length on a Garment

If you already own a shirt that fits you well and want to use it as a reference for ordering the same size elsewhere, measuring the garment directly works well.

Lay the shirt flat on a table.
Start the tape at the center of the back collar seam (the point where the collar meets the body of the shirt at the back).
Run the tape across the shoulder seam and down the sleeve to the end of the cuff.
Record the measurement.

This gives you the sleeve length as the manufacturer measures it, which is the number you use when ordering the same size from a different brand.

Tips for an Accurate Sleeve Length Measurement

Measure with the arm slightly bent, not straight. A straight arm gives you a shorter measurement and leads to sleeves that are too short when your arm is in a natural position.
Wear a thin shirt when measuring on the body. Thick layers push the tape away from your arm and affect the result.
Measure both arms. Most people have a slight difference between their left and right arm. Use the longer measurement to avoid sleeves that feel tight.
Ask someone to help. Measuring your own sleeve length solo is possible but harder to do accurately. A second person holding the starting point at the back of your neck makes the measurement more reliable.
Account for cuff style. French cuffs sit slightly lower on the wrist than button cuffs. If you wear French cuffs regularly, add about half an inch to your standard measurement.

Sleeve Length for Women’s Garments

Women’s sleeve measurements follow the same basic method but sizing systems differ by brand. Most women’s garments use S/M/L sizing rather than specific inch measurements. If you need a precise number, measure from the shoulder seam at the top of the shoulder down to your wrist bone with your arm slightly bent. This gives you the sleeve length to reference against a brand’s size chart.

The Short Answer

To measure sleeve length, stand with your arm slightly bent, start the tape at the center back of your neck, run it across your shoulder and down the outside of your arm to your wrist bone. That total measurement is your sleeve length. For measuring a garment, start at the center back collar seam and measure to the end of the cuff. Always measure with a slight bend in the arm for the most accurate result.