Choose a Measurement
Select a measurement and convert between different units
Single conversion
To convert from Microgram (mcg) to Stone (st), use the following formula:
With is the ratio between the base units Pound (lb) and Gram (g).
Let's convert 5 Microgram (mcg) to Stone (st).
Using the formula:
Therefore, 5 Microgram (mcg) is equal to Stone (st).
Here are some quick reference conversions from Microgram (mcg) to Stone (st):
| Micrograms | Stones |
|---|---|
| 0.000001 mcg | st |
| 0.001 mcg | st |
| 0.1 mcg | st |
| 1 mcg | st |
| 2 mcg | st |
| 3 mcg | st |
| 4 mcg | st |
| 5 mcg | st |
| 6 mcg | st |
| 7 mcg | st |
| 8 mcg | st |
| 9 mcg | st |
| 10 mcg | st |
| 20 mcg | st |
| 30 mcg | st |
| 40 mcg | st |
| 50 mcg | st |
| 100 mcg | st |
| 1000 mcg | st |
| 10000 mcg | st |
For all Weight converters, choose units using the From/To dropdowns above.
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.