Convert Milligrams to Stone
1 milligram (mg) equals 1.574730444 × 10⁻⁷ stone (st).
1 mg = 1.574730444e-7 st
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk milligram to stone converter to paste a column from Excel.
How to Convert Milligram to Stone
- 1 mg = 1.574730444 × 10⁻⁷ st
- 1 st = 6350293.18 mg
- Example: convert 15 mg to st: 15 mg = 15 × 1.574730444 × 10⁻⁷ st = 0.000002362095666 st
Reference conditions. st: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
st = mg × 1.574730444178 × 10⁻⁷
or st = mg ÷ 6350293.18
Derivation from SI units:
- 1 mg = 10⁻⁶ kg = 10⁻³ g
- 1 st = 14 lb = 6.35029318 kg (exact)
- 1 mg = 0.000001 kg ÷ 6.35029318 kg per st = 1.574730444178 × 10⁻⁷ st
Both units are defined exactly, so the factor is exact. Milligram definition: milligram; Stone definition: stone.
Worked examples
- A reading of 20 mg converts to 0.000003149460888 st.
20 mg × 1.574730444 × 10⁻⁷ = 0.000003149460888 st - A value of 250 mg is 0.0000393682611 st.
250 mg × 1.574730444 × 10⁻⁷ = 0.0000393682611 st
Milligram to Stone conversion table
| Milligrams (mg) | Stone (st) |
|---|---|
| 0.1 mg | 1.574730444 × 10⁻⁸ st |
| 0.5 mg | 7.873652221 × 10⁻⁸ st |
| 1 mg | 1.574730444 × 10⁻⁷ st |
| 2 mg | 3.149460888 × 10⁻⁷ st |
| 5 mg | 7.873652221 × 10⁻⁷ st |
| 10 mg | 0.000001574730444 st |
| 20 mg | 0.000003149460888 st |
| 25 mg | 0.00000393682611 st |
| 50 mg | 0.000007873652221 st |
| 65 mg | 0.00001023574789 st |
| 81 mg | 0.0000127553166 st |
| 100 mg | 0.00001574730444 st |
| 200 mg | 0.00003149460888 st |
| 250 mg | 0.0000393682611 st |
| 325 mg | 0.00005117873944 st |
| 400 mg | 0.00006298921777 st |
| 500 mg | 0.00007873652221 st |
| 1000 mg | 0.0001574730444 st |
| 2000 mg | 0.0003149460888 st |
| 5000 mg | 0.0007873652221 st |
Where it's used
Milligrams are used for medication doses (e.g. 500 mg tablets), while stone appear in body weight in the UK and Ireland (e.g. 11 st 6 lb). Both measure mass (commonly called weight), so the conversion is a fixed factor.
Milligram to other weight and mass units
| Conversion | 1 mg equals |
|---|---|
| milligram to kilogram | 0.000001 kg |
| milligram to gram | 0.001 g |
| milligram to microgram | 1000 µg |
| milligram to metric ton | 1 × 10⁻⁹ t |
| milligram to pound | 0.000002204622622 lb |
| milligram to ounce | 0.00003527396195 oz |
| milligram to stone | 1.574730444 × 10⁻⁷ st |
| milligram to short ton | 1.102311311 × 10⁻⁹ ton (US) |
| milligram to long ton | 9.842065276 × 10⁻¹⁰ ton (UK) |
| milligram to grain | 0.01543235835 gr |
| milligram to troy ounce | 0.00003215074657 oz t |
| milligram to carat | 0.005 ct |
Frequently asked questions
How many stone are in 1 milligram?
1 mg = 1.574730444 × 10⁻⁷ st.
How do I convert milligrams to stone?
Multiply the value in mg by 1.574730444 × 10⁻⁷, or divide it by 6350293.18. For example, 15 mg × 1.574730444 × 10⁻⁷ = 0.000002362095666 st.
Is the mg to st conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, pound (avoirdupois).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Milligrams to Stone. Retrieved October 17, 2026, from https://scientificconverters.com/mass/milligrams-to-stone/
IEEE
Scientific Converters, "Convert Milligrams to Stone," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/milligrams-to-stone/