Convert weight and mass units — kilograms, pounds, ounces, grams, tons, stones.
| Unit | Name | Value |
|---|---|---|
| kg | Kilogram | 0.0283495 |
| g | Gram | 28.3495 |
| mg | Milligram | 28349.5 |
| t | Metric Ton | 0.0000283495 |
| lb | Pound | 0.0625 |
| st | Stone | 0.0044642843 |
The Ounce (oz) and the Stone (st) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 oz = 0.004464284 st
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| Ounce (oz) | Stone (st) | Real-world context |
|---|---|---|
| 1 oz | 0.00446428 st | letter envelope |
| 100 oz | 0.44642843 st | |
| 1000 oz | 4.4642843 st | |
| 10000 oz | 44.6428431 st | |
| 100000 oz | 446.4284 st |
1 ounce (oz) equals exactly 0.00446428 stone (st). Use the formula: oz × 0.00446428 = st.
To convert ounces to stone, multiply your value in ounces by 0.00446428. For example, 5 oz × 0.00446428 = 0.02232142 st.
100 ounces = 0.44642843 stone. Calculation: 100 × 0.00446428 = 0.44642843.
To convert stone back to ounces, divide by 0.00446428 (or multiply by 224.0001). Example: 10 st ÷ 0.00446428 = 2240.0007 oz.
Yes. This converter uses the internationally recognised exact conversion factor: 1 oz = 0.00446428 st. All calculations are performed in your browser with no rounding until display.
10 ounces = 0.04464284 stone. Simply multiply by 0.00446428.
Converting ounces to stone is commonly needed for everyday tasks like cooking recipes, body weight tracking, shopping internationally, or shipping parcels where one system uses oz and another uses st.
The avoirdupois ounce (oz) equals exactly 28.349523125 grams or 1/16 of an avoirdupois pound. It is widely used in the US and UK for food portions, product packaging, and everyday measurements. Note that the troy ounce (31.1035 g), used for precious metals like gold and silver, is a different and heavier unit than the avoirdupois ounce.
The stone (st) is a British imperial unit of mass equal to exactly 14 avoirdupois pounds or 6.35029318 kilograms. Used almost exclusively in the United Kingdom and Ireland for human body weight, it has no role in scientific, commercial, or international contexts. The stone is not an SI unit and was removed from official UK trade measurement in 1985, though it remains deeply embedded in everyday British culture.
The word "ounce" derives from Latin uncia (a twelfth), originally 1/12 of the Roman pound. The avoirdupois ounce developed in medieval England specifically for the wool trade, creating a 16-ounce pound distinct from the Troy 12-ounce pound. The British Imperial system codified the ounce in 1824. The modern exact definition (28.349523125 g) was set by the 1959 International Yard and Pound Agreement.
Interesting fact: A troy ounce (31.1 g) used for gold is heavier than an avoirdupois ounce (28.35 g) used for food — so an "ounce" of gold contains more metal than an "ounce" of flour. A standard large hen's egg weighs approximately 56–63 grams (about 2 oz).
One of the oldest English weight units, the stone was referenced as early as the 13th century. Historically its value varied by commodity (8 lb for meat, 12 lb for hemp, 14 lb for wool, 16 lb for glass). King Edward III standardised the wool stone at 14 pounds in 1350, which became the universal English standard. The Weights and Measures Act 1835 formally defined the stone as 14 lb. EU harmonisation abolished the stone for trade in 1985.
Interesting fact: The world record heaviest person weighed 635 kg — exactly 100 stone, illustrating how the stone unit provides digestible reference points for large body weights. British people typically express their weight as, for example, "11 stone 4 pounds."