# Belt Size Calculator

> Belt size calculator converts your pant waist size into the correct belt length in inches and cm. Free, private, runs locally in your browser, no signup.

- **Canonical URL:** https://boringtoolskit.com/belt-size-calculator/
- **Category:** Converters
- **Evidence level:** authored-methodology
- **Reviewed:** 2026-09-20
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

Belt size convention: pants waist size + 2 inches of strap to reach the buckle, and the fit point is the middle of 5 holes. A 34-inch waist takes a 36 belt measured from fold to middle hole.

## Assumptions

- Manufacturer charts vary; conversion outputs are the standard-mapping midpoint.
- Measurements are body measurements unless the tool labels them as garment measurements.
- Between-size results round per the rule stated in the FAQ.

## Common questions

### Should I size up for a belt over a jacket?

Yes for heavy outerwear: +1 size. For everyday pants, the +2-inch rule already includes a shirt tucked in.

### What if I fall between sizes?

Round the direction that matches use: clothing and shoes generally round up.

## Sources

- [Aggregated manufacturer sizing conventions](https://boringtoolskit.com/methodology/)

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