Men's Fashion

Men's Shirt Size Calculator: Chest & Collar to Shirt Size

Free tool · Updated October 2, 2026 · By CouponTalk

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Quick answer

Men's shirts in India are sized by collar in centimetres (38, 40, 42, 44) or by letter (S to 3XL). Measure around your chest under the armpits and around the base of your neck. A 40" chest with a 15.75" neck is a Medium, collar 40 cm, which is about 15.5–16" in US/UK sizing.

How to measure

Chest: wrap the tape under your armpits around the fullest part of your chest, arms relaxed.
Neck: measure around the base of your neck where the collar sits, with one finger under the tape for comfort.
Measure over a thin t-shirt, not a thick shirt or jacket.

Men's Shirt Size Chart

Men's shirt size chart
Size	Indian collar (cm)	Chest	US / UK collar (in)
S	38	36–38" / 91–97 cm	15
M	40	38–40" / 97–102 cm	15.5–16
L	42	40–42" / 102–107 cm	16.5
XL	44	42–44" / 107–112 cm	17–17.5
XXL	46	44–46" / 112–117 cm	18
3XL	48	46–48" / 117–122 cm	18.5–19

Sizes vary between brands by 1–2 cm. Always check the brand's own size chart before you buy.

Frequently asked questions

What is size 40 in men's shirts?

Size 40 is the collar in centimetres. It fits a neck of about 15.75" (40 cm) and a chest of 38–40", and is usually labelled Medium (M).

Is 42 shirt size L or XL?

In most Indian brands, collar 42 is Large (L), fitting a 40–42" chest. Collar 44 is XL.

Should I choose slim fit or regular fit?

Slim fit has a narrower chest and waist, about 2 inches less than regular fit. If your chest is at the top of a size range, choose the next size up in slim fit.