Stone to Milligrams Converter

About the st to mg calculation

One stone is exactly 6,350,293.18 milligrams, so converting between them is a single multiplication. Enter any value above and the result updates as you type. A British unit of exactly 14 pounds, still the normal way to state bodyweight in the UK. The usual unit for medication doses and nutrient quantities.

Formula

mg = st × 6,350,293.18

1 st = 6,350,293.18 mg
1 mg = 1.5747e-7 st

Worked example

To convert 11 st, multiply by 6,350,293.18: 11 × 6,350,293.18 = 69,853,224.98 mg.

Frequently asked questions

How many milligrams are in a stone?

There are 6,350,293.18 milligrams in one stone. To convert any amount, multiply the number of stone by 6,350,293.18.

How do I convert milligrams back to stone?

Divide instead of multiplying, or equivalently multiply by 1.5747e-7. One milligram is 1.5747e-7 stone.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between stone and milligrams 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?

Stone: a British unit of exactly 14 pounds, still the normal way to state bodyweight in the UK. Milligrams: the usual unit for medication doses and nutrient quantities.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units