---
title: "Milligrams to Stone — mg to st converter"
description: "1 milligram = 1.575 × 10^-7 stone. Convert milligrams to stone with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/mg-to-stone/
site: "At One Place"
---

# Milligrams to stone

**1 milligram in stone: 1 mg = 1.575 × 10^-7 st**

st = mg × 1.574730444 × 10^-7

To convert milligrams to stone, multiply by 1.574730444 × 10^-7. The table below gives the values people look up most often, and the converter works for any number.

## Milligrams to stone table

*Common milligram values converted to stone.*

| Milligrams | Stone |
| --- | --- |
| 1 mg | 1.575 × 10^-7 |
| 2 mg | 3.149 × 10^-7 |
| 3 mg | 4.724 × 10^-7 |
| 4 mg | 6.299 × 10^-7 |
| 5 mg | 7.874 × 10^-7 |
| 10 mg | 0.000001575 |
| 15 mg | 0.000002362 |
| 20 mg | 0.000003149 |
| 25 mg | 0.000003937 |
| 30 mg | 0.000004724 |
| 40 mg | 0.000006299 |
| 50 mg | 0.000007874 |
| 75 mg | 0.00001181 |
| 100 mg | 0.00001575 |
| 250 mg | 0.00003937 |
| 500 mg | 0.00007874 |
| 1,000 mg | 0.0001575 |

## How the conversion works

The relationship is st = mg × 1.574730444 × 10^-7. 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

### How many stone are in one milligram?

One milligram equals 1.575 × 10^-7 stone. st = mg × 1.574730444 × 10^-7.

### How do you convert milligrams to stone?

Use st = mg × 1.574730444 × 10^-7. So 10 mg is 0.000001575 st.

### How many milligrams are in one stone?

One stone equals 6,350,293.2 milligrams, which is the reverse of the conversion above.

## Related pages

- [Stone to Milligrams](https://atoneplace.net/convert/stone-to-mg/)
- [Milligrams to Kilograms](https://atoneplace.net/convert/mg-to-kg/)
- [Milligrams to Grams](https://atoneplace.net/convert/mg-to-grams/)
- [Milligrams to Tonnes](https://atoneplace.net/convert/mg-to-tonnes/)
- [Milligrams to Pounds](https://atoneplace.net/convert/mg-to-lbs/)
- [Milligrams to Ounces](https://atoneplace.net/convert/mg-to-oz/)

## 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/)