# How the World Writes Numbers

> A sourced reference for how 57 locales write 1,234,567.89 — decimal marks, group separators, Indian lakh grouping and the SI recommendation.

**Dataset:** 57 locales · 2026 · Free to reuse under CC BY 4.0 — please credit YouCalc with a link.

## Key findings

- **Notable:** 9 conventions
- **SI form:** 1 234 567.89
- **Share:** 51%

## Get the data

- [Download the data (CSV)](https://youcalc.com/data/studies/how-the-world-writes-numbers.csv)
- [Full interactive study](https://youcalc.com/en/studies/how-the-world-writes-numbers/)