Stone to Microgram
st
μg
Conversion History
| Conversion | Reuse | Delete |
|---|---|---|
| No conversion history to show. | ||
Quick Reference Table (Stone to Microgram)
| Stone (st) | Microgram (μg) |
|---|---|
| 6 | 38,101,759,080 |
| 7 | 44,452,052,260 |
| 8 | 50,802,345,440 |
| 9 | 57,152,638,620 |
| 10 | 63,502,931,800 |
| 11 | 69,853,224,980 |
| 12 | 76,203,518,160 |
| 13 | 82,553,811,340 |
| 14 | 88,904,104,520 |
About Stone (st)
The stone (st) is a unit of weight equal to 14 pounds (approximately 6.35 kg), used almost exclusively in the United Kingdom and Ireland for expressing human body weight. A person weighing 70 kg is approximately 11 stone. The stone is rarely used outside body weight — commercial goods, food, and science all use kilograms in the UK. The stone is not part of the metric system and has no formal SI equivalent; its continued use is a cultural habit, particularly in older generations and media coverage of boxing and fitness.
Average UK adult body weight is often quoted as 11–13 stone. A jockey must typically weigh under 8.5 stone to compete.
Etymology: From the practice of using actual stones as counterweights on balance scales. Standardised in England at 14 pounds by the Weights and Measures Act 1835.
About Microgram (μg)
A microgram (μg) is one millionth of a gram (10⁻⁶ g), the smallest weight unit in routine scientific and pharmaceutical use. It is the standard unit for measuring active drug ingredients, vitamins, and trace contaminants. The symbol μg is the SI standard, though mcg (microgram) is also used in medical contexts to avoid confusion with the prefix "m" for milli. A human hair typically weighs 50–70 μg per millimeter of length, and a single grain of fine sand is around 50 μg.
A typical vitamin D supplement tablet contains 25 μg of active ingredient. A grain of fine sand weighs roughly 50 μg.
Stone – Frequently Asked Questions
How many pounds are in a stone?
One stone equals exactly 14 pounds. A person who weighs 10 stone weighs 140 pounds (63.5 kg). To convert stone to kilograms, multiply by 6.35; to convert to pounds, multiply by 14.
Do people outside the UK use stone for weight?
Stone is used in the UK and Ireland for body weight but is virtually unknown elsewhere. Australians, Canadians, and New Zealanders — who all once used it — have largely switched to kilograms. Americans use only pounds. If you quote your weight in stone outside the British Isles, expect blank looks.
Why is a stone 14 pounds?
The stone historically varied between 8 and 26 pounds depending on the commodity (wool, meat, cheese). The 14-pound standard was established by the English Weights and Measures Act of 1835, partly because 14 divides evenly into the 28-pound quarter and the 56-pound half-hundredweight.
Is stone used in medical settings in the UK?
The NHS officially uses kilograms in clinical contexts, and most medical equipment is calibrated in kg. However, many patients still report their weight in stone, so UK healthcare professionals routinely work in both systems. Obesity classifications (BMI categories) are always calculated in kilograms.
How do I convert my weight from kilograms to stone and pounds?
Divide your weight in kg by 6.35 to get stone. The whole number is your stone value; multiply the decimal remainder by 14 to get the remaining pounds. Example: 75 kg ÷ 6.35 = 11.81 stone → 11 stone and (0.81 × 14) ≈ 11 lbs, so 75 kg ≈ 11 stone 11 lbs.
Microgram – Frequently Asked Questions
What is a microgram used for?
Micrograms are used in pharmaceuticals, nutrition labels, and toxicology to express very small quantities of active substances. Common examples include vitamin D (25 μg = 1000 IU), folic acid (400 μg per tablet), and airborne particulate matter (PM2.5 measured in μg/m³).
What is the difference between μg and mcg?
Both μg and mcg mean microgram. The symbol mcg is used in clinical and US medical contexts to avoid misreading the Greek letter μ as "m" (milli). The SI standard is μg, but mcg is acceptable and common on supplement labels.
How many micrograms are in a milligram?
There are exactly 1,000 micrograms in one milligram. The chain is: 1 mg = 1,000 μg = 0.001 g. This conversion is critical in medication dosing, where confusing mg and μg can result in a 1,000-fold dosing error.
Why is microgram used instead of milligram for some vitamins?
Some vitamins (D, B12, K) are physiologically active in very small quantities — doses are 1–100 μg rather than milligrams. Using micrograms avoids expressing these doses as 0.001 mg or 0.0001 g, which is harder to read and more prone to error.
How much does a grain of salt weigh in micrograms?
A single grain of table salt (NaCl) weighs approximately 60–80 μg. A typical pinch of salt used in cooking is around 300,000–400,000 μg (0.3–0.4 g), or roughly 4,000–6,000 individual grains.