Convert Ounces (oz) to Stones (st)
1 ounce equals 0.00446429 stones.
Formula:
st = oz × 0.00446429
Ounce to Stone Converter
Enter a numeric value or fraction to convert
Result
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How to Convert Ounce to Stone
1 ounce = 0.00446429 stones
Stone = Ounce × 0.00446429
Example: 1 oz × 0.00446429 = 0.00446429 st
Reverse Conversion
To convert stones back to ounces:
- Remember, 1 stone equals 224 ounces.
- To convert 0.00446429 st to oz, multiply
0.00446429 x 224, resulting in1 oz.
Common Ounce to Stone Conversions
| Ounce | Stone | Actions |
|---|---|---|
| 50 ounces | 0.223214 stones | |
| 100 ounces | 0.446429 stones | |
| 500 ounces | 2.23214 stones | |
| 1000 ounces | 4.46429 stones |
Ounces to stones Conversion Table
Reference table with common ounces to stones conversions. All values calculated with high precision.
Ounces to Stones Table
1000 to 1 × 108
Stones to Ounces Table
1 to 100000
Definition of Ounce
- Definition
- The ounce (oz) is a unit of mass equal to one sixteenth of a pound in the avoirdupois system. It is commonly used for food portions, postal items, and small packages.
The ounce remains prevalent in countries using imperial or US customary units. - Exact factor
- 1 oz = 28.349523125 g = 0.0625 lb
- Examples
- • 16 oz = 1 lb
• 8 oz ≈ 226.8 g
Definition of Stone
- Definition
- The stone (st) is a traditional British unit of mass, primarily used for expressing human body weight in the UK and Ireland.
Although not part of the SI system, it remains culturally relevant and widely understood in health-related contexts. - Exact factor
- 1 st = 14 lb = 6.35029318 kg
- Examples
- • 11 st ≈ 69.85 kg
• 12 st 7 lb ≈ 79.38 kg
About the Ounce
Facts & Uses
- Avoirdupois ounce equals 1/16 of a pound = exactly 28.349523125 grams (derived from the 1959 Agreement on the pound).
- Standard unit for food portions (deli meats, cheese), postal letter weights (US 1st-class mail), and beverage servings (a 12 oz soda can).
- Common in cooking for both dry and fluid ingredients in the US — though the fluid ounce (volume) and ounce (mass) are unrelated and frequently confused.
- Used in boxing glove weights (8 oz / 10 oz / 12 oz), archery (arrow weight), and jewelry for non-precious metal items.
Curiosities
- The troy ounce (used for gold, silver, platinum) is heavier: 1 troy oz ≈ 31.1035 g, vs. 28.35 g for avoirdupois — a ~10% difference that matters at bullion prices.
- The symbol "oz" derives from the medieval Italian onza, in turn from the Latin uncia meaning "a twelfth part" (originally 1/12 of a Roman pound).
- 16 oz (1 lb) of feathers and 16 oz (1 lb) of gold weigh the same in avoirdupois — but the gold would actually weigh more if measured in troy ounces, since 1 lb troy = 12 troy oz only.
- 1 oz ≈ 28.35 g ≈ 437.5 grains.
Sources
About the Stone
Facts & Uses
- Traditional British and Irish unit equal to exactly 14 avoirdupois pounds = 6.35029318 kg. Still in everyday use in the UK and Ireland for body weight.
- Used in healthcare records, weight-loss programs, and sports broadcasting (boxing, rugby, horse racing) — typically reported as "X stone Y pounds" (e.g., 12 st 7 lb).
- Largely obsolete in commerce — UK retail and food packaging have used metric units (kg) since the 1995/2000 EU directives — but persists culturally for personal weight.
- Not used in the United States or in continental Europe; American expatriates in the UK often find the unit confusing on their first GP visit.
Curiosities
- The name comes literally from the practice of using stones as standard weights in medieval markets. The value varied wildly by region and commodity — from 4 lb (in some wool trades) to 32 lb (for cheese in Northumberland) — until the 1835 Weights and Measures Act fixed it at 14 lb.
- A typical adult man in the UK weighs around 11–14 stone (70–89 kg); a typical woman 9–12 stone (57–76 kg).
- The plural is irregular: "He weighs 12 stone" (singular form even for plural quantity) — a quirk of British English.
- 1 st = 14 lb = exactly 6.35029318 kg ≈ 224 oz.
Sources
Frequently Asked Questions
How many stones are in one ounce?
One ounce equals 0.00446429 stones. To convert, multiply the ounce value by 0.00446429. For the reverse, divide the stone value by 0.00446429 (or multiply by 224).
What is 250 ounces in stones?
250 ounces = 1.1161 stones. This is one of the most commonly searched conversions for this pair.
How precise is the ounce-to-stone conversion?
The factor 0.00446429 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.
Looking for the reverse? Convert Stone to Ounce
Related Weight (Mass) Converters
Explore other weight (mass) conversion tools:
Need a combined format?
- Kg to Pounds and Ounces — combined lb + oz format
- Kg to Stones and Pounds — UK body weight format
Related in other categories:
- G-force to m/s² — Force = mass × acceleration (F = ma)
Conversion factors verified against NIST (National Institute of Standards and Technology), BIPM (International Bureau of Weights and Measures)
1 lb = 0.45359237 kg by international agreement (1959).
Last reviewed: March 2026
