---
title: "21 g to st = 0.0033069 st"
description: "21 grams is 0.0033069 stone. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/21-grams-to-stone/
site: "At One Place"
---

# 21 g to st

**21 grams in stone: 21 g = 0.0033069 st**

st = g × 0.000157473044

21 grams is 0.0033069 stone. To get there, multiply by 0.000157473044.

## Values either side

*Grams near 21, converted to stone.*

| Grams | Stone |
| --- | --- |
| 17 g | 0.002677 |
| 18 g | 0.0028345 |
| 19 g | 0.002992 |
| 20 g | 0.0031495 |
| 21 g ← | 0.0033069 |
| 22 g | 0.0034644 |
| 23 g | 0.0036219 |
| 24 g | 0.0037794 |
| 25 g | 0.0039368 |

## How the conversion works

The relationship is st = g × 0.000157473044. Both units measure mass, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two.

## Common questions

### What is 21 g in stone?

21 g is 0.0033069 st.

### How do you convert grams to stone?

Multiply by 0.000157473044.

## Related pages

- [Grams to stone](https://atoneplace.net/convert/grams-to-stone/)
- [21 st to g](https://atoneplace.net/convert/21-stone-to-grams/)
- [17 g to st](https://atoneplace.net/convert/17-grams-to-stone/)
- [18 g to st](https://atoneplace.net/convert/18-grams-to-stone/)
- [19 g to st](https://atoneplace.net/convert/19-grams-to-stone/)
- [20 g to st](https://atoneplace.net/convert/20-grams-to-stone/)
- [22 g to st](https://atoneplace.net/convert/22-grams-to-stone/)
- [23 g to st](https://atoneplace.net/convert/23-grams-to-stone/)
- [24 g to st](https://atoneplace.net/convert/24-grams-to-stone/)
- [25 g to st](https://atoneplace.net/convert/25-grams-to-stone/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)