Convert weight and mass units — kilograms, pounds, ounces, grams, tons, stones.
| Unit | Name | Value |
|---|---|---|
| kg | Kilogram | 6.35029 |
| g | Gram | 6350.29 |
| mg | Milligram | 6350290 |
| t | Metric Ton | 0.00635029 |
| lb | Pound | 14.000004 |
| oz | Ounce | 224.00007 |
The Stone (st) and the Milligram (mg) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 st = 6350290 mg
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| Stone (st) | Milligram (mg) | Real-world context |
|---|---|---|
| 1.0000e-06 st | 6.35029 mg | |
| 0.001 st | 6350.29 mg | |
| 0.01 st | 63502.9 mg | |
| 0.1 st | 635029 mg | |
| 1 st | 6,350,290 mg |
1 stone (st) equals exactly 6,350,290 milligrams (mg). Use the formula: st × 6,350,290 = mg.
To convert stone to milligrams, multiply your value in stone by 6,350,290. For example, 5 st × 6,350,290 = 31,751,450 mg.
100 stone = 635,029,000 milligrams. Calculation: 100 × 6,350,290 = 635,029,000.
To convert milligrams back to stone, divide by 6,350,290 (or multiply by 1.5747e-07). Example: 10 mg ÷ 6,350,290 = 1.5747e-06 st.
Yes. This converter uses the internationally recognised exact conversion factor: 1 st = 6,350,290 mg. All calculations are performed in your browser with no rounding until display.
10 stone = 63,502,900 milligrams. Simply multiply by 6,350,290.
Converting stone to milligrams is commonly needed for medical dosing, laboratory measurements, pharmaceutical calculations, and quality control testing where one system uses st and another uses mg.
The stone (st) is a British imperial unit of mass equal to exactly 14 avoirdupois pounds or 6.35029318 kilograms. Used almost exclusively in the United Kingdom and Ireland for human body weight, it has no role in scientific, commercial, or international contexts. The stone is not an SI unit and was removed from official UK trade measurement in 1985, though it remains deeply embedded in everyday British culture.
The milligram (mg) is a unit of mass equal to one-thousandth of a gram (0.001 g) or one-millionth of a kilogram (10⁻⁶ kg). It is the standard unit for drug dosing in medicine and pharmacology, where precise small quantities are critical for safety and efficacy. The prefix "milli-" comes from Latin mille meaning one thousand.
One of the oldest English weight units, the stone was referenced as early as the 13th century. Historically its value varied by commodity (8 lb for meat, 12 lb for hemp, 14 lb for wool, 16 lb for glass). King Edward III standardised the wool stone at 14 pounds in 1350, which became the universal English standard. The Weights and Measures Act 1835 formally defined the stone as 14 lb. EU harmonisation abolished the stone for trade in 1985.
Interesting fact: The world record heaviest person weighed 635 kg — exactly 100 stone, illustrating how the stone unit provides digestible reference points for large body weights. British people typically express their weight as, for example, "11 stone 4 pounds."
Established as a derived unit when the metric system was formalised in the late 18th century. The milligram rose to critical importance with the growth of pharmacology in the 19th and 20th centuries, as chemists isolated active compounds and found that tiny quantities produced strong therapeutic — or toxic — effects. Modern pharmacopoeias worldwide specify drug doses in milligrams.
Interesting fact: A single grain of table salt weighs about 58 mg. One standard 325 mg aspirin tablet means that 1,000 tablets weigh only 325 grams — less than a can of soft drink.