A stone is 14 pounds.
Stones to Ounces Converter — st to oz
Convert Stone (st) to Ounce (oz) using the exact conversion factor (1 stone = 224 ounce). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Stones to Ounces 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.
An avoirdupois ounce is 1/16 pound.
Result = input x 6.35029318 / 0.02834952313.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones to Ounces
Weight conversions between Stone and Ounce 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 typically associated with united Kingdom and Ireland (body weight), while Ounce is typically associated with united States (cooking, postal, retail).
Formula
ounces = stones × 224
This factor comes from each unit's defined relationship to the category's base unit: 1 stone equals 6.35029318 base units, and 1 ounce equals 0.028349523125 base units, so dividing one by the other gives the direct stone-to-ounce factor of 224.
Simple example
1 st × 224 = 224 oz
1 stone = 224 ounces.
Real-world example
50 st × 224 = 11,200 oz
50 stones = 11,200 ounces.
Conversion table
| Stone (st) | Ounce (oz) |
|---|---|
| 1 st | 224 oz |
| 5 st | 1,120 oz |
| 10 st | 2,240 oz |
| 25 st | 5,600 oz |
| 50 st | 11,200 oz |
| 100 st | 22,400 oz |
Reverse conversion: Ounce to Stone
224 oz × 0.004464285714 = 1 st
224 ounces = 1 stone.
stones = ounces × 0.00446428571429
For a page dedicated to this direction, see Ounce to Stone.
Stone vs. Ounce
| Aspect | Stone | Ounce |
|---|---|---|
| Family | UK customary unit | US/imperial customary unit |
| Typical use | Body weight reporting in the UK and Ireland (e.g. '12 stone 5 pounds') | US cooking and recipe measurement (small quantities) |
| Where it's used | United Kingdom and Ireland (body weight) | United States (cooking, postal, retail) |
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 Ounce
Ounce (oz) measures mass. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. It is classified as a US/imperial customary unit.
Where it's used: United States (cooking, postal, retail) United Kingdom (informal/retail use)
Avoirdupois ounce vs. troy ounce. The everyday ounce (avoirdupois, 28.35 g) used for cooking and shipping is a different, smaller unit than the troy ounce (31.10 g) used for precious metals like gold and silver — this page uses the everyday avoirdupois ounce.
Uses of the Ounce today
- US cooking and recipe measurement (small quantities)
- US postal and shipping weight
- Precious metals (troy ounce, a related but distinct unit)
History of the Ounce
The ounce descends from the Roman 'uncia' (a twelfth part), inherited through medieval English weight systems; the avoirdupois ounce (for general goods, as opposed to the troy ounce for precious metals) became standard for everyday trade, fixed at exactly 28.349523125 g via the pound's 1959 international standardization.
Historical origin. Ounce was not the invention of a single named person; it developed through the process described above.
Stone — sources
- UK Weights and Measures Act 1985 — Confirms the stone (14 lb) as a legally recognized UK unit for body weight.
Ounce — sources
- NIST — International yard and pound (1959) — Basis for the modern ounce via the standardized pound.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ounces are in 1 stone?
1 stone equals 224 ounces, using the exact defined conversion factor rather than an estimate.
How do I convert stone to ounce?
Multiply the stone value by 224. The converter above does this instantly to whatever precision you set.
How do I convert ounce back to stone?
Use the reverse factor: 1 ounce equals 0.0044642857 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 ounce?
Ounce (oz) measures mass. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. It is classified as a US/imperial customary unit.
Is the stone to ounce conversion exact?
Yes. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between avoirdupois ounce vs. troy ounce?
The everyday ounce (avoirdupois, 28.35 g) used for cooking and shipping is a different, smaller unit than the troy ounce (31.10 g) used for precious metals like gold and silver — this page uses the everyday avoirdupois ounce.
Where is the stone still used today?
United Kingdom and Ireland (body weight)