About the mg to st calculation
One milligram is exactly 1.5747e-7 stone, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The usual unit for medication doses and nutrient quantities. A British unit of exactly 14 pounds, still the normal way to state bodyweight in the UK.
Formula
st = mg × 1.5747e-7
1 mg = 1.5747e-7 st
1 st = 6,350,293.18 mgWorked example
To convert 500 mg, multiply by 1.5747e-7: 500 × 1.5747e-7 = 0.00007874 st.
Frequently asked questions
How many stone are in a milligram?
There are 1.5747e-7 stone in one milligram. To convert any amount, multiply the number of milligrams by 1.5747e-7.
How do I convert stone back to milligrams?
Divide instead of multiplying, or equivalently multiply by 6,350,293.18. One stone is 6,350,293.18 milligrams.
Is this conversion exact?
Yes. Since the international agreement of 1959, the relationship between milligrams and stone is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.
Where is each of these units used?
Milligrams: the usual unit for medication doses and nutrient quantities. Stone: a British unit of exactly 14 pounds, still the normal way to state bodyweight in the UK.
Sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units