Milligrams to Stones Converter
Enter the weight in milligrams below to convert it to stones.
Convert Milligrams to Stones
Enter a value in milligrams (mg) to convert to stones (st).
Milligram to Stone Conversion Table
Table showing various milligram measurements converted to stones. Click any preset value or arrow to load it into the converter.
| Milligrams (mg) | Stones (st) |
|---|---|
| 1 mg | 0.000000157 st |
| 10 mg | 0.000001575 st |
| 100 mg | 0.000015747 st |
| 1,000 mg | 0.000157473 st |
| 10,000 mg | 0.0015747 st |
| 100,000 mg | 0.0157473 st |
| 1,000,000 mg | 0.157473 st |
| 5,000,000 mg | 0.7873652 st |
| 10,000,000 mg | 1.5747304 st |
| 25,400,000 mg | 3.9998153 st |
How to Convert Milligrams to Stones
To convert milligrams to stones, multiply the weight by the following conversion ratio: 0.000000157 stones/milligram.
Since one milligram is equal to 0.000000157 stones, you can use this simple formula to convert:
The weight in stones is equal to the weight in milligrams multiplied by 0.000000157.
For example, here's how to convert 5 milligrams to stones using the formula above.
How Many Stones Are in a Milligram?
There are 0.000000157 stones in a milligram, which is why we use this value in the formula above.
Our milligram to stone calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Milligrams and stones are both units used to measure weight. Keep reading to learn more about each unit.
What Is a Milligram?
A milligram is a unit of weight equal to 1/1,000,000 of a kilogram (0.000001 kg). One-thousandth of a gram (10⁻⁶ kg). [1]
The milligram is classified as a metric and SI-compatible unit of weight. Milligrams can be abbreviated as mg; for example, 1 milligram can be written as 1 mg.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the milligram (mg) a convenient decimal multiple of the gram (g).
In practice, milligrams (mg) are widely used across fine-tolerance laboratory, analytical, and micro-scale weight measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is a Stone?
A stone is a unit of weight equal to 6.3502932 kilograms (kg), the base unit for weight. British imperial unit equal to 14 pounds (6.35029 kg). [2]
The stone is classified as a US customary and imperial unit of weight. Stones can be abbreviated as st; for example, 1 stone can be written as 1 st.
When working with stones (st) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, stones (st) are widely used across standard weight applications within US customary and imperial workflows, engineering documentation, and technical data sheets.
When converting weight between milligrams (mg) and stones (st), keep full floating-point precision (1 mg = 0.000000157 st; 1 st = 6,350,293.18 mg) during intermediate calculations and round only the final stone figure to match your instrument tolerance.
More Milligram & Stone Conversions
Need to calculate in the opposite direction? Use our stones to milligrams calculator to switch your starting unit immediately. You can also explore related tools such as converting stones to milligrams, converting pounds to stones, or converting kilograms to stones.
Convert from Milligrams
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Mass)·Mass & Weight Metrology Standard — Milligrams (mg) to Stones (st)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Milligram (mg) & Stone (UK) (st)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (mg to st)