Ounce to Stone Converter
Convert ounces to stones with our free online weight converter.
Quick Answer
1 Ounce = 0.004464 stones
Formula: Ounce × conversion factor = Stone
Use the calculator below for instant, accurate conversions.
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All conversion formulas on UnitsConverter.io have been verified against NIST (National Institute of Standards and Technology) guidelines and international SI standards. Our calculations are accurate to 10 decimal places for standard conversions and use arbitrary precision arithmetic for astronomical units.
Ounce to Stone Calculator
How to Use the Ounce to Stone Calculator:
- Enter the value you want to convert in the 'From' field (Ounce).
- The converted value in Stone will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Weight category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Ounce to Stone: Step-by-Step Guide
Converting Ounce to Stone involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Ounce = 0.00446429 stonesExample Calculation:
Convert 5 ounces: 5 × 0.00446429 = 0.0223214 stones
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
Need to convert to other weight units?
View all Weight conversions →What is a Ounce and a Stone?
The ounce (symbol: oz, from Italian onza) is a unit of mass equal to exactly 1/16 of an avoirdupois pound, which is 28.349523125 grams in the metric system.
Avoirdupois Ounce vs. Troy Ounce
When Americans say "ounce" in everyday life, they almost always mean the avoirdupois ounce (28.35 g). However, there's a second type of ounce:
Avoirdupois Ounce (Standard Ounce):
- 28.35 grams
- Used for: food, cooking, postal weight, groceries, body weight, general commerce
- 16 ounces = 1 avoirdupois pound
Troy Ounce:
- 31.10 grams (about 10% heavier)
- Used exclusively for: precious metals (gold, silver, platinum), gemstones, gunpowder
- 12 troy ounces = 1 troy pound
- Abbreviated: "oz t" or "ozt"
Critical distinction: When buying gold or silver, prices are quoted per troy ounce (31.1 g), not avoirdupois ounce (28.35 g). A troy ounce is about 2.75 grams heavier than a standard ounce.
Ounce vs. Fluid Ounce
This is one of the most common sources of confusion in American cooking:
Ounce (oz): Measures weight/mass
- Used for solid or bulk ingredients: flour, sugar, meat, cheese
- 1 oz = 28.35 grams
- Measured with a scale
Fluid Ounce (fl oz): Measures volume/capacity
- Used for liquids: water, milk, juice, oil
- 1 fl oz = 29.57 milliliters (US) or 28.41 mL (UK)
- Measured with measuring cups
When they happen to match: For pure water at room temperature, 1 fluid ounce weighs approximately 1 ounce. This coincidence often misleads people into thinking oz and fl oz are interchangeable—they're not.
Example of the difference:
- 8 fl oz of water weighs about 8 oz
- 8 fl oz of honey weighs about 12 oz (honey is denser)
- 8 fl oz of olive oil weighs about 7.3 oz (oil is less dense)
Mathematical Relationships
1 ounce equals:
- 1/16 of a pound (exactly)
- 28.349523125 grams (exactly)
- 0.028349523125 kilograms
- 437.5 grains (grain is an even smaller unit)
- 28,349.523125 milligrams
Common fractions of a pound:
- 1 oz = 1/16 lb = 0.0625 lb
- 4 oz = 1/4 lb = 0.25 lb (quarter-pound)
- 8 oz = 1/2 lb = 0.5 lb (half-pound)
- 12 oz = 3/4 lb = 0.75 lb
- 16 oz = 1 lb (full pound)
1 stone = 14 avoirdupois pounds (lb) = 6.35029318 kilograms (kg) EXACT
The stone (symbol: st) is a unit of mass in the Imperial system, legally defined in terms of pounds, which are themselves defined in terms of kilograms. The exact conversion is:
1 pound = 0.45359237 kilograms (international definition, 1959)
1 stone = 14 × 0.45359237 kg = 6.35029318 kg
Stone and Pounds Notation
The stone is almost never used alone for body weight. Instead, it's combined with additional pounds:
Format: "X stone Y pounds" or "X st Y lb"
Examples:
- 10 st 0 lb = 10 stone exactly = 140 lb = 63.5 kg
- 10 st 7 lb = 10 stone + 7 pounds = 147 lb = 66.7 kg
- 12 st 3 lb = 12 stone + 3 pounds = 171 lb = 77.6 kg
Why this format? It provides precision without unwieldy decimal places. Saying "10.5 stone" is rare—people say "10 stone 7" instead (10 stone + 7 pounds = 10.5 stone).
Stone vs. Kilogram vs. Pound
Three systems for measuring body weight:
| System | Unit | Used In | Precision | |-----------|----------|-------------|---------------| | Imperial (UK) | Stone + Pounds | UK, Ireland | "11 st 7 lb" (161 lb) | | Imperial (US) | Pounds only | United States, Canada | "161 lb" | | Metric | Kilograms | Most of the world | "73 kg" |
Cultural difference:
- Americans say "I weigh 161 pounds"
- British say "I weigh 11 stone 7" (rarely "161 pounds")
- Europeans say "I weigh 73 kilograms"
Why 14 Pounds?
The number 14 has no scientific basis—it's purely historical. Medieval England used base-12 counting (duodecimal) for some systems:
- 12 inches = 1 foot
- 12 pence = 1 shilling (pre-1971)
- But 14 pounds = 1 stone (not 12!)
Theory: The 14-pound wool stone emerged from trade practices. A "sack of wool" weighed 364 pounds = 26 stones (26 × 14 = 364), a convenient round number for taxation and commerce.
Note: The Ounce is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Stone belongs to the imperial/US customary system.
History of the Ounce and Stone
Roman Origins: The Uncia
Latin Etymology: The word "ounce" comes from the Latin "uncia," meaning "one-twelfth" (related to "inch," from the same root).
Roman Measurement: In ancient Rome, the uncia was 1/12 of a Roman pound (libra), approximately 27 grams. The Romans used base-12 (duodecimal) systems for many measurements.
Symbol Origin: The abbreviation "oz" comes from the medieval Italian word onza (ounce), not from any English word starting with "o" and "z."
Medieval European Variation
Regional Chaos: Throughout medieval Europe, dozens of different "ounces" existed, varying by region, city, and trade guild. An ounce in Paris differed from an ounce in London, Venice, or Amsterdam.
Two Main English Systems:
Troy System (for precious goods):
- Used for gold, silver, jewels, and later gunpowder
- Troy ounce: 31.1 grams
- 12 troy ounces = 1 troy pound
- Named after Troyes, France, site of important medieval trade fairs
Avoirdupois System (for bulk goods):
- From French avoir de pois ("goods of weight")
- Used for wool, grain, cheese, meat—everyday bulk commodities
- Avoirdupois ounce: 28.35 grams
- 16 avoirdupois ounces = 1 avoirdupois pound
- Developed by medieval merchants for practical trade
English Standardization
1300s-1500s: Gradual Standardization: English monarchs attempted to standardize weights and measures, but variation persisted.
1588: Queen Elizabeth I: Confirmed the avoirdupois system for general trade, establishing 16 ounces per pound for commerce.
Troy System Preserved: The troy ounce remained the standard for precious metals, a tradition maintained to this day.
1959: International Agreement
Modern Definition: The 1959 international yard and pound agreement between the United States, United Kingdom, Canada, Australia, New Zealand, and South Africa defined:
- 1 pound (avoirdupois) = exactly 453.59237 grams
- 1 ounce (avoirdupois) = exactly 1/16 pound = 28.349523125 grams
This eliminated minor variations between US and British measurements and anchored imperial units to the metric system.
Ancient and Medieval Origins (Pre-1300)
The concept of standardized stones: Before precise metallic weights, communities used stones as trade counterweights. A merchant would keep a reference stone in the marketplace, verified by local authorities, against which goods were weighed.
Advantages:
- Durability: Stones don't corrode or wear like metal
- Availability: Every village had stones
- Tamper-resistance: Hard to secretly shave weight off a stone
Problem: Every region had different stones! The "stone of wool" in Yorkshire differed from the "stone of wool" in Kent.
Medieval Standardization Attempts (1300-1824)
Edward III's wool stone (1340): King Edward III standardized the wool stone at 14 pounds as part of regulating the lucrative wool trade (England's economic backbone in the Middle Ages). The "sack of wool" was defined as 364 pounds = 26 stones.
Commodity-specific stones: Different goods had different stone weights:
| Commodity | Stone Weight | Reasoning | |--------------|-----------------|---------------| | Wool | 14 lb (6.35 kg) | Trade standard | | Meat | 8 lb (3.63 kg) | Butcher's stone | | Glass | 5 lb (2.27 kg) | Fragile goods | | Cheese | 16 lb (7.26 kg) | Agricultural products | | Iron | Variable (8-15 lb) | Regional differences |
Why different weights? Practical reasons:
- Heavy commodities (iron, lead): Smaller stone weight made counting easier
- Light, valuable goods (wool, spices): Larger stone weight reduced fractions
- Tradition: Each guild jealously guarded its customary weights
The Weights and Measures Act 1824
The problem: By 1800, Britain had dozens of incompatible stone definitions, creating chaos in trade and taxation.
The solution: The 1824 Act standardized British weights and measures:
- 14 pounds = 1 stone (for general use, not tied to specific commodities)
- Stone officially defined in relation to the pound
- Commodity-specific stones discouraged (but not banned)
Imperial standardization: The Act also defined:
- 1 pound = 7,000 grains
- 16 ounces = 1 pound
- 14 pounds = 1 stone
- 8 stone = 1 hundredweight (112 pounds)
- 20 hundredweight = 1 ton (2,240 pounds)
Body weight adoption: The Victorian era (1837-1901) saw the stone become the standard for human weighing. Bathroom scales, medical records, and public health data used stones and pounds.
Metrication and Persistence (1965-Present)
The Weights and Measures Act 1965: The UK officially adopted the metric system, making kilograms the legal unit for trade. However, the Act exempted personal weighing—bathroom scales could continue showing stones.
Why the exemption?
- Cultural resistance: Brits refused to abandon stones for body weight
- Economic lobbying: Scale manufacturers didn't want to retool
- Medical inertia: NHS records already used stones; conversion would be costly
The result: 60+ years later, the stone persists:
- Bathroom scales: Default to stones in the UK (even modern digital ones)
- NHS medical records: Still record patient weight in stones/pounds
- Weight loss programs: Slimming World, Weight Watchers UK use stones
- Media: British newspapers report celebrity weight in stones
- Sports: Boxing, horse racing, rowing use stones for weight classes
Ireland's experience: Ireland officially adopted metric units in 2005, but the stone remains common for body weight, especially among older generations.
Generational divide:
- Older Brits (60+): Think exclusively in stones
- Middle-aged (30-60): Bilingual (stones and kilograms)
- Younger (<30): Increasingly use kilograms, but still understand stones
Cultural Tenacity
The stone is the most persistent Imperial unit in British daily life, outlasting:
- Fahrenheit: Replaced by Celsius (weather, ovens)
- Inches/feet for height: Partially replaced by metres (though feet still common)
- Pints: Milk sold in litres (though beer still sold in pints!)
- Miles: Road signs still use miles (the UK never fully switched)
Why the stone survives:
- Emotional connection: Body weight is personal; changing units feels invasive
- Convenient range: For adults, weight is 8-20 stones (easy to remember vs. 50-127 kg)
- Medical exemption: Doctors use stones, so patients use stones
- Social reinforcement: Everyone around you uses stones, so you do too
Common Uses and Applications: ounces vs stones
Explore the typical applications for both Ounce (imperial/US) and Stone (imperial/US) to understand their common contexts.
Common Uses for ounces
Cooking and Baking
Recipe Measurements: American recipes commonly specify ingredient weights in ounces:
- Dry ingredients: flour, sugar, chocolate chips, nuts
- Solid fats: butter, shortening, cream cheese
- Proteins: chicken breasts (6 oz), ground beef (12 oz)
Kitchen Scales: Digital kitchen scales display weight in ounces (and grams), allowing precise measurement:
- Toggle between oz and g
- Tare function to zero out container weight
- Precision to 0.1 oz or 1 gram
Baker's Preference: Professional bakers prefer weight (ounces) over volume (cups) because:
- More accurate and consistent
- Eliminates measurement errors
- Works regardless of how ingredients settle or compact
Grocery Shopping and Pricing
Price per Pound, Sold by Ounce: Many items are priced per pound but sold in ounce quantities:
- Deli meat: "$8.99/lb, customer orders 6 oz"
- Cheese: "$10.99/lb, customer gets 4 oz"
- Bulk nuts: "$12.99/lb, customer takes 8 oz"
Nutrition Labels: US food labels show serving size in both household measures and ounces:
- "Serving Size: 3/4 cup (30g, about 1 oz)"
- This allows people to weigh food if they don't have measuring cups
Comparison Shopping: Savvy shoppers compare unit prices (price per ounce) to find better deals:
- Large box cereal: $0.25/oz
- Small box cereal: $0.35/oz
- Buying larger sizes often reduces cost per ounce
Postal Services and Shipping
USPS Pricing Tiers: First-Class Mail costs increase per ounce:
- 0-1 oz: $0.68 (2024 rate)
- 1-2 oz: $0.92
- 2-3 oz: $1.16
- 3-3.5 oz: $1.40
Package Weight Categories:
- Under 1 pound: priced per ounce
- Over 1 pound: typically priced per pound
Shipping Strategy: Sellers carefully package items to stay under weight thresholds, sometimes removing extra packaging to save an ounce.
Precious Metals and Jewelry
Troy Ounce Standard: Gold, silver, platinum, and palladium are traded globally in troy ounces:
- Gold price: "$2,050 per troy ounce" (example)
- Silver price: "$25 per troy ounce" (example)
- Bullion bars marked in troy ounces (1 oz, 10 oz, etc.)
Jewelry Weights: Precious metal jewelry is often described by weight:
- "14K gold chain, 0.5 troy oz"
- "Sterling silver bracelet, 1.2 troy oz"
Investment: Investors buy gold/silver coins and bars measured in troy ounces (1 oz American Gold Eagle, 5 oz silver bar).
Medical and Healthcare
Infant Weight: Hospitals and pediatricians measure newborn weight in pounds and ounces:
- Birth weight: "7 pounds 6 ounces"
- Weight checks: tracking gains of 4-6 oz per week
- Feeding goals: "baby should gain 5-7 oz weekly"
Medication Dosing: Some medications dose by body weight:
- Pediatric doses calculated per pound or per ounce
- Conversion to metric (kg) for precise dosing
Nutrition and Dietetics: Dietitians often recommend portion sizes in ounces:
- "3 oz serving of protein" (deck of cards size)
- "1 oz serving of cheese" (pair of dice size)
Portion Control and Diet
Standard Serving Sizes:
- Meat/fish: 3-4 oz (cooked)
- Cheese: 1-1.5 oz
- Nuts: 1 oz (small handful)
- Pasta: 2 oz dry per serving
- Cereal: 1 oz (varies by type; check label)
Visual Cues for Ounces:
- 3 oz meat = deck of playing cards
- 1 oz cheese = pair of dice
- 1 oz nuts = small handful
- 2 oz pasta = fits in cupped palm
When to Use stones
1. Body Weight Measurement
The stone is the unit for body weight in the UK and Ireland.
Bathroom scales:
- Display: "11 st 7 lb" (digital) or analog dial with stone markings
- Dual units: Many scales toggle between st/lb and kg
- Default: Stones for UK-sold scales, even from international brands
Weighing yourself:
- British: "I'm 12 stone 3"
- American: "I'm 171 pounds"
- European: "I'm 78 kilograms"
Weight goals:
- "I want to lose a stone" = 14-pound goal
- "I'm aiming for 10 stone" = target weight
- "I've gained half a stone" = 7-pound increase
2. Medical and Healthcare
NHS patient records: British hospitals and GPs record weight in stones/pounds (with kg conversion).
Medical forms:
- Pre-op questionnaires: "Weight: __ st __ lb"
- Prescription dosing: Sometimes based on weight (converted to kg for calculations)
- Anesthesia planning: Weight in stones converted to kg for drug dosages
Maternity care:
- Booking appointment: "What was your pre-pregnancy weight?" (stones)
- Pregnancy weight tracking: "You've gained 2 stone, which is healthy"
- Post-natal: "Most women lose 1-2 stone in the first weeks"
Mental health context: Eating disorder treatment tracks weight changes in stones (e.g., anorexia recovery: "gained 1 stone to 7 stone 10").
3. Weight Loss and Fitness
Slimming clubs:
- Slimming World, Weight Watchers UK: Weigh-ins in stones
- Awards: "Half-stone hero," "Stone club," "3-stone milestone"
- Targets: "Lose 10% of body weight" (e.g., 1.5 stone from 15 stone start)
Fitness apps (UK versions):
- MyFitnessPal UK: Input weight in stones
- Fitbit/Garmin: UK users set goals in stones
- Weight tracking graphs: Y-axis shows stones, not kg
Personal trainers: British trainers discuss client progress in stones: "You've dropped from 14 stone to 12 stone 8—fantastic!"
4. Sports Weight Classes
Boxing: British boxing traditionally used stones for weight classes (now officially kilograms, but stones still common in commentary).
Horse racing:
- Jockey weights: Includes jockey + saddle + lead weights to meet required "riding weight"
- Handicapping: Horses carry different weights (in stones) to equalize competition
- Penalties: "Carrying 9 stone 7" vs. "Carrying 10 stone" affects race outcomes
Rowing: Lightweight rowers must weigh under certain stone limits (now metric, but historically stones).
5. Everyday Conversation
The stone pervades British informal speech:
Common phrases:
- "I'm 11 stone, give or take" = approximate weight
- "She must be 10 stone soaking wet" = very light
- "He's put on a stone since Christmas" = seasonal weight gain
- "I haven't been 9 stone since I was 15!" = nostalgic reference
Social etiquette:
- It's impolite to ask someone's weight directly, but acceptable to discuss your own
- Women might say "I'm trying to get back to 9 stone" (goal weight)
6. Media and Entertainment
British TV shows:
- Reality TV: "Love Island" contestants' weights discussed in tabloids (stones)
- Medical shows: "Embarrassing Bodies" references patient weight in stones
- Game shows: "The Biggest Loser UK" tracked loss in stones
Newspapers and magazines:
- Celebrity weight speculation: "Has she lost 2 stone?"
- Health articles: "How to lose half a stone by summer"
- Success stories: "I lost 8 stone and transformed my life!"
7. Historical and Cultural References
Literature: Victorian novels reference weight in stones:
- Dickens, Austen rarely mention specific weights (impolite)
- 20th-century literature: "She was a strapping girl of 12 stone"
British humor: Comedians joke about weight in stones:
- "I'm not overweight, I'm just undertall for my 14 stone!"
Generational markers:
- Older Brits: "When I got married, I was 8 stone"
- Modern comparison: "That's only 112 pounds—too thin by today's standards!"
Additional Unit Information
About Stone (st)
1. How many pounds are in a stone?
Exactly 14 pounds.
This is a defined constant. There are no regional variations—1 stone always equals 14 pounds in any context.
Calculation examples:
- 5 stone = 5 × 14 = 70 pounds
- 12 stone = 12 × 14 = 168 pounds
- 0.5 stone = 0.5 × 14 = 7 pounds
2. Is the stone used outside the UK and Ireland?
Rarely. The stone is almost exclusive to the UK and Ireland.
Usage by country:
- UK: Dominant for body weight (even with official metrication)
- Ireland: Common, especially among older generations
- Canada, Australia, New Zealand: Not used (fully metric)
- United States: Not used (pounds only)
- Rest of world: Not used (metric)
Exception: British expats abroad sometimes use stones, and international weight loss forums may reference stones when discussing UK participants.
3. Why is it called a stone?
Historical practice: Actual stones were used as standardized weights in medieval markets.
How it worked:
- A community selected a reference stone of agreed weight
- The stone was kept in the marketplace (sometimes literally built into a wall)
- Merchants used the reference stone on balance scales to verify weights
- Different stones existed for different commodities (wool stone, meat stone, etc.)
Modern name: The unit name "stone" is a fossil of this practice, long after actual stones stopped being used.
4. How do you convert stone to kilograms?
Formula:
Kilograms = Stone × 6.35029318
Quick approximation:
Kilograms ≈ Stone × 6.35 (good to 3 decimal places)
Examples:
- 10 stone × 6.35 = 63.5 kg
- 12 stone × 6.35 = 76.2 kg
- 15 stone × 6.35 = 95.25 kg
Online tools: Most conversion sites and apps include stone ↔ kilogram calculators.
5. How do British people talk about their weight?
Typical format: "I'm X stone Y pounds" or "I'm X stone Y"
Examples:
- "I'm 11 stone 7" = 11 stone + 7 pounds = 161 lb = 73 kg
- "I'm just over 12 stone" = slightly more than 168 lb
- "I'm nearly 10 stone" = approaching 140 lb
Rarely said:
- "I'm 11.5 stone" (uncommon—people say "11 stone 7" instead)
- "I'm 161 pounds" (too American—Brits don't think in pounds alone)
- "I'm 73 kilograms" (used by younger generations, but less common)
Conversational weight: Discussing weight is somewhat taboo, so people often avoid specifics: "I need to lose a bit of weight" rather than "I need to drop from 13 to 11 stone."
6. Do British bathroom scales show kilograms?
Yes, most modern scales show both.
Typical features:
- Default: Stones and pounds (st/lb)
- Toggle button: Switch to kilograms
- Dual display: Some show both simultaneously
Older scales: Analog scales from before 2000 often show stones only.
Buying scales in the UK: Even international brands (Fitbit, Garmin) sell UK-specific versions that default to stones.
7. Will the UK ever stop using stones?
Unlikely in the near future.
Reasons for persistence:
- Cultural attachment: Body weight is personal; people resist change
- Legal exemption: Personal weighing scales exempt from trade regulations
- NHS inertia: Changing medical records costly
- Generational use: Older generations use stones exclusively
- No enforcement: No push to mandate kilograms for personal use
Trend: Younger Brits (under 30) increasingly use kilograms, especially those who travel or use fitness apps with international audiences. However, the stone will likely persist for decades among older populations.
Comparison: Similar to Fahrenheit in the US—officially discouraged but culturally entrenched.
8. What is a "half stone"?
Half stone = 7 pounds = 3.175 kg
Usage:
- Weight loss: "I've lost half a stone" = 7 lb loss
- Weight gain: "I've put on half a stone over Christmas" = 7 lb gain
- Milestones: "Half-stone club" in weight loss programs
Why significant? Half a stone is a noticeable weight change—enough to affect how clothes fit and how you feel, but achievable in 3-7 weeks of dieting (at 1-2 lb/week loss).
9. How do you write stone and pounds?
Common formats:
Formal:
- "11 stone 7 pounds"
- "11 st 7 lb"
Informal:
- "11 stone 7"
- "11st 7lb" (no spaces)
- "11-7" (very casual, context-dependent)
Avoid:
- "11.7 stone" (ambiguous—could mean 11 stone 7 lb or 11 stone 9.8 lb)
- "11/7 st" (confusing notation)
Medical records: NHS typically uses "st/lb" format: "Patient weight: 12 st 3 lb"
10. Why do Americans not use stone?
The United States never adopted the stone for body weight.
Historical reasons:
- Colonial divergence: By the time the stone standardized in Britain (1824), the US had already established pounds as the body weight unit
- Decimal preference: Americans favored simpler base-10 systems where possible
- No cultural push: No equivalent to UK's Victorian-era adoption of stones for weighing people
Result: Americans think in pounds only:
- "I weigh 180 pounds" (no stones)
- Weight loss: "I lost 30 pounds" (not "2 stone 2 pounds")
Canadian note: Canada officially metricated in the 1970s and uses kilograms, not stones or pounds (though older Canadians may still think in pounds).
11. Is stone a legal unit?
Yes, in the UK and Ireland, but with restrictions.
Legal status:
- Personal use: Fully legal (bathroom scales, self-weighing)
- Trade: Must use metric (kilograms) for selling goods by weight
- Medical: Allowed in patient records (NHS uses stones)
Weights and Measures Act: Kilograms are the legal unit for commerce, but stones remain legal for "non-trade" purposes (personal weighing, medical records).
Comparison: Similar to miles on UK road signs—officially metric, but exceptions preserve traditional units in specific contexts.
12. How much is a stone in other historical weight units?
Stone in troy and apothecary systems:
Troy weight (precious metals):
- 1 stone (avoirdupois) = 14 pounds (avoirdupois)
- 1 pound (avoirdupois) = 7,000 grains
- 1 stone = 98,000 grains (troy)
- 1 troy pound = 5,760 grains
- 1 stone ≈ 17.01 troy pounds
Apothecaries' weight (pharmacy):
- Same grain as troy and avoirdupois (64.79891 mg)
- 1 stone = 98,000 grains (apothecaries')
Why this matters: Historically, pharmacists used apothecaries' weights, so understanding stone conversions was important for dosing medicines based on body weight.
Conversion Table: Ounce to Stone
| Ounce (oz) | Stone (st) |
|---|---|
| 0.5 | 0.002 |
| 1 | 0.005 |
| 1.5 | 0.007 |
| 2 | 0.009 |
| 5 | 0.022 |
| 10 | 0.045 |
| 25 | 0.112 |
| 50 | 0.223 |
| 100 | 0.446 |
| 250 | 1.116 |
| 500 | 2.232 |
| 1,000 | 4.464 |
People Also Ask
How do I convert Ounce to Stone?
To convert Ounce to Stone, enter the value in Ounce in the calculator above. The conversion will happen automatically. Use our free online converter for instant and accurate results. You can also visit our weight converter page to convert between other units in this category.
Learn more →What is the conversion factor from Ounce to Stone?
The conversion factor depends on the specific relationship between Ounce and Stone. You can find the exact conversion formula and factor on this page. Our calculator handles all calculations automatically. See the conversion table above for common values.
Can I convert Stone back to Ounce?
Yes! You can easily convert Stone back to Ounce by using the swap button (⇌) in the calculator above, or by visiting our Stone to Ounce converter page. You can also explore other weight conversions on our category page.
Learn more →What are common uses for Ounce and Stone?
Ounce and Stone are both standard units used in weight measurements. They are commonly used in various applications including engineering, construction, cooking, and scientific research. Browse our weight converter for more conversion options.
For more weight conversion questions, visit our FAQ page or explore our conversion guides.
Helpful Conversion Guides
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📚 How to Convert Units
Step-by-step guide to unit conversion with practical examples.
🔢 Conversion Formulas
Essential formulas for weight and other conversions.
⚖️ Metric vs Imperial
Understand the differences between measurement systems.
⚠️ Common Mistakes
Learn about frequent errors and how to avoid them.
All Weight Conversions
Other Weight Units and Conversions
Explore other weight units and their conversion options:
- Kilogram (kg) • Ounce to Kilogram
- Gram (g) • Ounce to Gram
- Milligram (mg) • Ounce to Milligram
- Pound (lb) • Ounce to Pound
- Ton (metric) (t) • Ounce to Ton (metric)
- Ton (US) (ton) • Ounce to Ton (US)
- Ton (UK) (long ton) • Ounce to Ton (UK)
- Microgram (µg) • Ounce to Microgram
- Carat (ct) • Ounce to Carat
- Slug (sl) • Ounce to Slug
Verified Against Authority Standards
All conversion formulas have been verified against international standards and authoritative sources to ensure maximum accuracy and reliability.
National Institute of Standards and Technology — US standards for weight and mass measurements
International Organization for Standardization — International standard for mechanics quantities
Last verified: December 3, 2025