# Jean Size Calculator

> Jean size calculator converts your waist and hip measurements into matching US, UK and EU jeans sizes for men and women. Free, runs locally, no signup.

- **Canonical URL:** https://boringtoolskit.com/jean-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

Jeans use two numbers: width (waist in inches, often measured on the garment, which runs 1-2 inches larger than body waist) x length (inseam in inches). Women's sizing additionally maps to a single number via a brand-specific fit model.

## 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

### Why do 32x32 pants from two brands fit differently?

Fit model, rise, and garment measurement conventions differ. The spec that travels between brands is body waist + inseam + rise preference, which is exactly what this calculator normalizes.

### 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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