Decision guide
How to measure yourself for menswear.
You need a flexible tape measure, or a piece of string and a ruler, ten minutes, and a second person if you can find one. Measure in the underwear you would actually wear beneath the garment, stand naturally, and keep the tape snug against the body without pulling it tight.
The short answer
Six measurements cover almost every purchase.
Chest, waist, inseam, shoulder width, sleeve length, and neck size will get you an accurate fit on the large majority of shirts, trousers, jackets, and suits sold online. Take each one twice and use the average if the two readings differ.
Write the numbers down somewhere you will actually find them again. A phone note works; the goal is not to remeasure from scratch every time you shop.
Step by step
How to take each measurement correctly.
Around the fullest point
Wrap the tape under your arms and across the widest part of your chest and shoulder blades. Keep it level and parallel to the floor, arms relaxed at your sides, and breathe normally rather than expanding your chest.
Where your trousers actually sit
Measure around your natural waist, roughly at your navel, not where low-rise trousers might sit lower. Keep one finger between the tape and your body so the number reflects a comfortable fit, not a compressed one.
Crotch to ankle bone, on an existing pair
The easiest method: lay a well-fitting pair of trousers flat and measure from the crotch seam to the bottom hem. Measuring on your own body requires a second person and a book held snug at the crotch as a reference point.
Seam to seam, across the back
With a well-fitting jacket or shirt on, measure from one shoulder seam to the other across the back of the neck. This number rarely changes with weight fluctuation, which makes it one of the more reliable sizing anchors.
Shoulder seam to wrist bone
Bend your arm slightly at the elbow, the way it sits when standing naturally, and measure from the shoulder seam down to the wrist bone. A straight-arm measurement will read shorter than what you actually need.
Base of the neck, plus a little room
Wrap the tape around the base of your neck where a shirt collar sits, then add roughly half an inch for comfortable buttoning. A too-tight neck measurement is the most common cause of a shirt that fits everywhere else but chokes at the collar.
Getting an accurate reading
Small habits that change the number.
- Measure over the right layer. Chest and waist should be taken over the underwear or thin layer you would actually wear beneath the garment, not a bulky sweater.
- Keep the tape level. A tape that dips or rises around the body reads inconsistently. Check in a mirror or ask a second person to confirm it stays parallel to the floor.
- Stand naturally, not at attention. Pulling your shoulders back or sucking in your stomach changes the reading and produces a garment that fits the pose, not the person.
- Recheck after major changes. Significant weight change, a new training routine, or a long gap since your last measurement are all good reasons to remeasure rather than trust old numbers.
Next decision