# Jacket Size Calculator

URL: https://speedycalculator.com/calculators/everyday-life/jacket-size/
Last updated: 2026-10-25

> The jacket size calculator finds men's suit-jacket size (chest number and short, regular or long) and women's jacket size in US, EU and letter sizing from chest, bust, hip and height measurements.

## Inputs

- Sizing
- Chest / bust (in, cm)
- Height (in, cm, ft)
- Hips (in, cm)

## Results

- Men's US/UK chest size
- Men's length
- Men's EU size
- Men's letter size
- Women's US size
- Women's EU size

## Formula

```
Men: jacket size = chest (in); length S < 5'8", R 5'8"–6'0", L > 6'0"; EU = chest (cm) ÷ 2
Women: size from the larger of bust and hip on the standard chart
```

## Explanation

Men's jackets are sold by chest size in inches with a length code, so a 40R fits a 40 in chest on someone of average height. European sizes are half the chest in centimetres (40 in ≈ 50). Women's jackets follow dress sizes, and when bust and hips fall in different sizes the larger one should usually be chosen.

### How to use the Jacket Size Calculator

- **Sizing**
- **Chest / bust**
- **Height**
- **Hips**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Choose men's or women's sizing, then measure the chest (or bust) at the fullest part with arms relaxed, plus height (men) or hips (women).

### Tips

- Measure over thin clothing with a soft tape held snug but not tight, and keep the tape level all the way round.
- Take each measurement twice; if you are between sizes, the larger size is usually the safer choice.
- Size charts vary by brand and country – check the maker's own chart when it is available.
- For sewing projects, pre-wash fabric before cutting and buy 10% extra for shrinkage, pattern matching and mistakes.

### Common mistakes to avoid

- Mixing inches and centimetres between the tape and the size chart.
- Forgetting seam and hem allowances when cutting fabric.
- Measuring an old, stretched garment instead of your body.

### Inputs explained

FieldWhat to enterSizingChoose one: Men's, Women'sChest / bustUnits: in, cmHeightUnits: in, cm, ftHipsUnits: in, cm

### What each result means

- **Men's US/UK chest size** = 2×round([Chest ÷ bust]÷0.0254÷2)
- **Men's EU size** = 2×round([Chest ÷ bust]÷0.01÷4)
- **Women's US size** = min([Women's size index], 12)
- **Women's EU size** = min([Women's size index], 12)

### Example values

How the main result changes when **Chest / bust** changes and everything else stays at the example values above:

Chest / bust (in)Men's US/UK chest size202030304040505060608080

## Worked example

Inputs — Sizing: Men's; Chest / bust: 40 in; Height: 70 in; Hips: 40 in.

Results — **Men's US/UK chest size = 40**; Men's length = Regular (R); Men's EU size = 50; Men's letter size = M; Women's US size = 14; Women's EU size = 44.

## FAQ

**What does 40R mean?**
A 40 in chest with regular length, for men roughly 5'8"–6'0" tall.

**How do I convert US jacket size to EU?**
Add 10 for men: US 40 = EU 50.

**Should a jacket be my exact chest size?**
Yes – the jacket size already includes the ease for movement.

**What formula does the Jacket Size Calculator use?**
Men: jacket size = chest (in); length S < 5'8", R 5'8"–6'0", L > 6'0"; EU = chest (cm) ÷ 2.