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To convert from Milligram (mg) to Stone (st), use the following formula:
Stone (st)
= 11000 × 1453.59237 × 114× Milligram (mg)
= 1.5747304441776970052× 10-7× Milligram (mg)
With 1453.59237 is the ratio between the base units Pound (lb) and Gram (g).
Let's convert 5 Milligram (mg) to Stone (st).
Using the formula:
5 × 1.5747304441776970052× 10-7 = 7.873652220888485026× 10-7
Therefore, 5 Milligram (mg) is equal to 7.873652220888485026× 10-7 Stone (st).
How many milligrams are in one stone? One Stone (st) contains 6350293.18 Milligrams (mg) — the inverse of the factor above. Multiplying by 1.5747304441776970052× 10-7 takes you from milligrams to stones; multiplying by 6350293.18 brings you back.
Put in words: one milligram equals 1.5747304441776970052× 10-7 stones, so the milligram 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 milligram, abbreviated as mg, is a tiny unit of mass in the metric system.
It's equal to one-thousandth of a gram (0.001 g). While incredibly small, the milligram plays a massive role in our daily health, from the medicine we take to the food we eat.
The milligram (mg) is a critical unit of measurement for quantifying the active ingredients in medications. Its small size allows for the precise dosage needed to make a drug effective and safe.
Why is dosage in mg so important?
You'll see milligram (mg) dosages clearly listed on standard medications, such as aspirin, ibuprofen, and prescription pills.
When you read a nutrition facts label, you'll see many vitamins and minerals listed in milligrams (mg).
Essential nutrients like Vitamin C, iron, calcium, and sodium are all measured in mg to help you understand your daily intake. For example, the recommended daily allowance of Vitamin C for an adult is around 75-90 mg. Understanding these measurements is key to maintaining a balanced and healthy diet.
It can be difficult to picture just how small a milligram is. Here's a simple way to visualize it:
The name itself gives a clue: it combines the Latin prefix "milli" (meaning "thousandth") with the base unit, gram. This means there are 1,000 milligrams in one gram.
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 Milligram (mg) to Stone (st):
| Milligrams | Stones |
|---|---|
| 0.000001 mg | 1.5747304441776970052× 10-13 st |
| 0.001 mg | 1.5747304441776970052× 10-10 st |
| 0.1 mg | 1.5747304441776970052× 10-8 st |
| 1 mg | 1.5747304441776970052× 10-7 st |
| 2 mg | 3.1494608883553940104× 10-7 st |
| 3 mg | 4.7241913325330910156× 10-7 st |
| 4 mg | 6.2989217767107880208× 10-7 st |
| 5 mg | 7.873652220888485026× 10-7 st |
| 6 mg | 9.4483826650661820312× 10-7 st |
| 7 mg | 0.0000011023113109243879036 st |
| 8 mg | 0.0000012597843553421576042 st |
| 9 mg | 0.0000014172573997599273047 st |
| 10 mg | 0.0000015747304441776970052 st |
| 20 mg | 0.0000031494608883553940104 st |
| 30 mg | 0.0000047241913325330910156 st |
| 40 mg | 0.0000062989217767107880208 st |
| 50 mg | 0.000007873652220888485026 st |
| 100 mg | 0.000015747304441776970052 st |
| 1000 mg | 0.00015747304441776970052 st |
| 10000 mg | 0.0015747304441776970052 st |
For all Weight converters, choose units using the From/To dropdowns above.