Belt sizes are measured from where the leather folds at the buckle to the middle hole, so a belt labelled 36 fits a 34 in trouser waist with room to adjust either way. Measuring a belt that already fits is the most reliable method.
How to use the Belt Size Calculator
- I know my
- Measurement
Results update as you type, and every field accepts the units shown in its menu.
How it works
Choose what you know (your waist circumference, your trouser size or the length of a belt that fits) and enter it.
Belt size chart
| Trouser waist | Belt size | Letter |
|---|---|---|
| 28–30 in | 30–32 | XS |
| 30–32 in | 32–34 | S |
| 34–36 in | 36–38 | M |
| 38–40 in | 40–42 | L |
| 42–44 in | 44–46 | XL |
| 46–48 in | 48–50 | 2XL |
Inputs explained
| Field | What to enter |
|---|---|
| I know my | Choose one: Waist circumference (measured), Trouser / jeans waist size, Old belt: buckle fold to the hole I use |
| Measurement | Units: in, cm |
What each result means
- European size (cm) = round([Belt size]÷0.05)×5
- Approximate overall belt length = [Belt size] + 5.5×0.0254
Formula
Belt size = trouser waist size + 2 in (5 cm)
Belt size from an old belt = length from the buckle fold to the hole you use
Total belt length ≈ belt size + 5–6 in for the buckle and tip
Worked example
Inputs: I know my: Trouser / jeans waist size; Measurement: 34 in.
Results: Belt size = 36 in; European size (cm) = 90; Letter size = M; Approximate overall belt length = 41 in.
Frequently asked questions
What size belt for 34 waist jeans?
A size 36 belt.
How do I measure a belt?
Measure from the fold where the buckle attaches to the hole you use most.
What if I am between sizes?
Choose the larger size. You can always use a tighter hole.