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To convert from Microgram (mcg) to Stone (st), use the following formula:
Stone (st)
= 1106 × 1453.59237 × 114× Microgram (mcg)
= 1.5747304441776970052× 10-10× Microgram (mcg)
With 1453.59237 is the ratio between the base units Pound (lb) and Gram (g).
Let's convert 5 Microgram (mcg) to Stone (st).
Using the formula:
5 × 1.5747304441776970052× 10-10 = 7.873652220888485026× 10-10
Therefore, 5 Microgram (mcg) is equal to 7.873652220888485026× 10-10 Stone (st).
How many micrograms are in one stone? One Stone (st) contains 6350293180 Micrograms (mcg) — the inverse of the factor above. Multiplying by 1.5747304441776970052× 10-10 takes you from micrograms to stones; multiplying by 6350293180 brings you back.
Put in words: one microgram equals 1.5747304441776970052× 10-10 stones, so the microgram is the smaller unit of this pair. Converting between them never changes the amount of weight being measured — only the size of the unit you count it in.
A microgram (mcg) is a unit of mass equal to one-millionth of a gram.
While the official symbol for the microgram in the International System of Units (SI) is μg (using the Greek letter Mu), you'll often see it written as mcg.
This is particularly common in the medical and pharmaceutical fields.
Using 'mcg' is a crucial safety measure to prevent dosage errors. A handwritten 'μg' could easily be mistaken for 'mg' (milligram), which would result in a 1,000-times overdose—a potentially fatal mistake.
The microgram is the go-to unit for measuring very potent substances, where tiny differences matter for both safety and effectiveness.
It's used for specific substances like:
Measuring in micrograms makes it possible to give an effective dose without risking toxicity.
It's hard to picture how tiny a microgram is.
For perspective, a single grain of ordinary table salt weighs about 500–600 micrograms — meaning a single grain contains more than 500 micrograms.
That helps explain why we measure very potent substances in micrograms: their active doses are tiny.
The stone (st) is a unit of measurement equal to 14 pounds (lb).
It's part of the imperial system and is still commonly used in a few countries, especially for weighing people.
For use in international contexts or scientific applications, the stone is often converted to the metric system.
One stone is equal to exactly 6.35029318 kilograms (kg).
This precise conversion is used in international trade and science to ensure everyone is using the exact standard measurement.
Although it's an older unit, the stone remains the primary unit of measurement for body weight in the United Kingdom and Ireland.
It's common to hear someone state their weight as a combination of stone and pounds, like "12 stone 6 pounds."
The stone traces its origins back to the medieval English wool trade, where a "stone of wool" referred to a standard 14-pound measure used for buying and selling.
Stones for other goods could vary in weight—for example, a stone of glass was just 5 pounds—but over time, the 14-pound stone became the official legal standard.
The stone is almost never used on its own. Body weight in Britain and Ireland is quoted as stones and pounds, with the remainder written out rather than expressed as a decimal.
A person weighing 72 kg is "11 stone 4" — that is 11 st 4 lb, or 158 pounds — not "11.3 stone". Reading the decimal form as pounds is a common error: 11.3 st is 11 st 4.2 lb, close by coincidence, but 11.5 st means 11 st 7 lb, not 11 st 5 lb.
The conversions worth keeping to hand are:
The unit's survival is unusually specific. It was removed from British trade use by weights and measures legislation, so nothing is sold by the stone — shop scales read in kilograms and grams.
What survives is personal and conversational use: body weight, and by extension the weight of livestock and sporting figures such as boxing and horse-racing weights. Medical records in the UK are kept in kilograms, but patients are routinely told their weight in stones and pounds because that is the number they recognise.
Outside Britain and Ireland the unit is essentially unknown. The United States, despite sharing the pound, does not use the stone at all — American body weight is quoted in pounds alone, which is why a US figure of "158 lb" and a UK figure of "11 st 4" describe exactly the same person.
Here are some quick reference conversions from Microgram (mcg) to Stone (st):
| Micrograms | Stones |
|---|---|
| 0.000001 mcg | 1.5747304441776970052× 10-16 st |
| 0.001 mcg | 1.5747304441776970052× 10-13 st |
| 0.1 mcg | 1.5747304441776970052× 10-11 st |
| 1 mcg | 1.5747304441776970052× 10-10 st |
| 2 mcg | 3.1494608883553940104× 10-10 st |
| 3 mcg | 4.7241913325330910156× 10-10 st |
| 4 mcg | 6.2989217767107880208× 10-10 st |
| 5 mcg | 7.873652220888485026× 10-10 st |
| 6 mcg | 9.4483826650661820312× 10-10 st |
| 7 mcg | 1.1023113109243879036× 10-9 st |
| 8 mcg | 1.2597843553421576042× 10-9 st |
| 9 mcg | 1.4172573997599273047× 10-9 st |
| 10 mcg | 1.5747304441776970052× 10-9 st |
| 20 mcg | 3.1494608883553940104× 10-9 st |
| 30 mcg | 4.7241913325330910156× 10-9 st |
| 40 mcg | 6.2989217767107880208× 10-9 st |
| 50 mcg | 7.873652220888485026× 10-9 st |
| 100 mcg | 1.5747304441776970052× 10-8 st |
| 1000 mcg | 1.5747304441776970052× 10-7 st |
| 10000 mcg | 0.0000015747304441776970052 st |
For all Weight converters, choose units using the From/To dropdowns above.