A stone is 14 pounds.
Stones to Solar mass Converter — st to Msun
Convert Stone (st) to Solar mass (Msun) using the exact conversion factor (1 stone = 3.193557e-30 solar mass). See the formula, worked examples, conversion table, history, and common uses.
Stones to Solar mass converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
Solar mass is used in astronomy.
Result = input x 6.35029318 / 1.98847e+30.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones to Solar mass
Weight conversions between Stone and Solar mass come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Stone is most often used for body weight reporting in the uk and ireland (e.g. '12 stone 5 pounds').
Formula
solar mass = stones × 3.193557e-30
This factor comes from each unit's defined relationship to the category's base unit: 1 stone equals 6.35029318 base units, and 1 solar mass equals 1.98847e+30 base units, so dividing one by the other gives the direct stone-to-solar mass factor of 3.193557e-30.
Simple example
1 st × 3.193557e-30 = 3.193557e-30 Msun
1 stone = 3.193557e-30 solar mass.
Real-world example
50 st × 3.193557e-30 = 1.596779e-28 Msun
50 stones = 1.596779e-28 solar mass.
Conversion table
| Stone (st) | Solar mass (Msun) |
|---|---|
| 1 st | 3.193557e-30 Msun |
| 5 st | 1.596779e-29 Msun |
| 10 st | 3.193557e-29 Msun |
| 25 st | 7.983894e-29 Msun |
| 50 st | 1.596779e-28 Msun |
| 100 st | 3.193557e-28 Msun |
Reverse conversion: Solar mass to Stone
3.193557e-30 Msun × 3.131304e+29 = 0.9999998595 st
3.193557e-30 solar mass = 0.9999998595 stones.
stones = solar mass × 3.131304e+29
For a page dedicated to this direction, see Solar mass to Stone.
Understanding the Stone
Stone (st) measures mass. A stone is 14 pounds: exactly 6.35029318 kilograms. It is classified as a UK customary unit.
Where it's used: United Kingdom and Ireland (body weight)
Uses of the Stone today
- Body weight reporting in the UK and Ireland (e.g. '12 stone 5 pounds')
- Historical wool and agricultural produce weighing
History of the Stone
The stone dates to medieval England as a general-purpose weight unit, historically varying by region and commodity (a 'stone' of wool differed from a 'stone' of meat) before settling on 14 pounds for general use. It remains in everyday use for body weight in the UK and Ireland, unlike most other English customary units which have been replaced or supplemented by metric measures.
Historical origin. Stone was not the invention of a single named person; it developed through the process described above.
Understanding the Solar mass (Msun)
Solar mass is used in astronomy.
Stone — sources
- UK Weights and Measures Act 1985 — Confirms the stone (14 lb) as a legally recognized UK unit for body weight.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many solar mass are in 1 stone?
1 stone equals 3.193557e-30 solar mass, using the exact defined conversion factor rather than an estimate.
How do I convert stone to solar mass?
Multiply the stone value by 3.193557e-30. The converter above does this instantly to whatever precision you set.
How do I convert solar mass back to stone?
Use the reverse factor: 1 solar mass equals 3.131304e+29 stones. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone?
Stone (st) measures mass. A stone is 14 pounds: exactly 6.35029318 kilograms. It is classified as a UK customary unit.
What is a solar mass?
Solar mass (Msun) is a unit of mass/weight.
Is the stone to solar mass conversion exact?
Yes. A stone is 14 pounds: exactly 6.35029318 kilograms. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the stone still used today?
United Kingdom and Ireland (body weight)