A stone is 14 pounds.
Stones to Petagrams Converter — st to Pg
Convert Stone (st) to Petagram (Pg) using the exact conversion factor (1 stone = 6.350293e-12 petagram). See the formula, worked examples, conversion table, history, and common uses.
Stones to Petagrams 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.
Petagram is 1000000000000000 gram units.
Result = input x 6.35029318 / 1e+12.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones to Petagrams
Weight conversions between Stone and Petagram 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
petagrams = stones × 6.350293e-12
This factor comes from each unit's defined relationship to the category's base unit: 1 stone equals 6.35029318 base units, and 1 petagram equals 1e+12 base units, so dividing one by the other gives the direct stone-to-petagram factor of 6.350293e-12.
Simple example
1 st × 6.350293e-12 = 6.350293e-12 Pg
1 stone = 6.350293e-12 petagrams.
Real-world example
50 st × 6.350293e-12 = 3.175147e-10 Pg
50 stones = 3.175147e-10 petagrams.
Conversion table
| Stone (st) | Petagram (Pg) |
|---|---|
| 1 st | 6.350293e-12 Pg |
| 5 st | 3.175147e-11 Pg |
| 10 st | 6.350293e-11 Pg |
| 25 st | 1.587573e-10 Pg |
| 50 st | 3.175147e-10 Pg |
| 100 st | 6.350293e-10 Pg |
Reverse conversion: Petagram to Stone
6.350293e-12 Pg × 157473044400 = 0.9999999717 st
6.350293e-12 petagrams = 0.9999999717 stones.
stones = petagrams × 157473044418
For a page dedicated to this direction, see Petagram 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 Petagram (Pg)
Petagram is 1000000000000000 gram units.
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 petagrams are in 1 stone?
1 stone equals 6.350293e-12 petagrams, using the exact defined conversion factor rather than an estimate.
How do I convert stone to petagram?
Multiply the stone value by 6.350293e-12. The converter above does this instantly to whatever precision you set.
How do I convert petagram back to stone?
Use the reverse factor: 1 petagram equals 157,473,044,400 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 petagram?
Petagram (Pg) is a unit of mass/weight.
Is the stone to petagram 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)