Jacket Size Calculator: Denim, Bomber, Puffer and Leather Jacket Size
Free tool · Updated October 2, 2026 · By CouponTalk
Your result
Enter your measurements to see your result.
Quick answer
Jacket size starts from your chest (or bust), plus room for what you wear underneath. Over a T-shirt, buy your usual size. Over a sweater or hoodie you need about 1.5 inches more room, and for thick winter layers about 3 inches. A men's 38-inch chest is M over a T-shirt, but L over a hoodie. Leather jackets should fit close, since leather eases slightly with wear.
How to measure
- Measure your chest or bust over a T-shirt.
- Choose the jacket style.
- Choose what you will wear under it most often.
Jacket Size Chart
| Worn over | Add to chest | Example: 38" chest |
|---|---|---|
| T-shirt | 0" | M |
| Sweater or hoodie | 1.5" | L |
| Thick winter layers | 3" | L |
Fits vary by brand: slim, regular and relaxed cuts differ by about one size.
Frequently asked questions
How should a jacket fit?
Shoulder seams at your shoulder edge, sleeves ending at the wrist bone, and room to cross your arms.
Should a puffer jacket be bigger?
Yes. Puffers are worn over layers, so leave about 3 inches over your chest.
Does a leather jacket stretch?
Slightly, mostly at the elbows and shoulders. Buy a close fit, not a tight one.
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