Stone to Ounces (st to oz)
1 stone equals 224 ounces exactly.
How to convert stone to ounces
To convert stone to ounces, multiply the number of stone by 224. This factor is exact. To go the other way, multiply ounces by 0.004464285714 (rounded).
ounces = stone × 224
Example: 10 stone = 2,240 ounces.
About these units
Stone (st)
14 pounds (6.35 kg). Still the everyday unit for body weight in the UK and Ireland.
As the name says, the first stones were literal stones. People used them as weights, and surviving examples include Roman-era pieces made in multiples of the Roman pound and a 16th-century bronze one-stone weight bearing the English royal arms. The size was not fixed: a statute of about 1300 gave 5 pounds for glass, 8 for sugar and spices and 12 for lead, while in 1772 the Encyclopaedia Britannica noted that a stone of beef was 8 pounds in London, 12 in Hertfordshire and 16 in Scotland. Edward III set 14 pounds for wool and other goods in 1350.
The Weights and Measures Act 1835 clarified the legal trade units, with 14 pounds to the stone and 28 to the quarter. Trade use ended with metrication, in Ireland in 1983 and in the UK with the Weights and Measures Act 1985, yet the stone refuses to die. In Britain and Ireland people still say they weigh 11 stone 4, meaning 11 stone plus 4 pounds, or about 71.7 kg. It is also used in sports such as boxing, wrestling and horse racing. A single stone, at 6.35 kg, is a convenient chunk of body weight to talk about.
1 stone = 6.35029318 kilograms (exactly).
Sources: Wikipedia: Stone (unit); NIST Guide to the SI, Appendix B.8 (mass conversions)
Ounce (oz)
One sixteenth of a pound, exactly 28.349523125 g. Used for food, mail and consumer goods in the US and UK.
A twelfth part is what ounce originally meant. It comes from the Roman uncia, one twelfth of the Roman pound, a word that also gave English the inch. The abbreviation oz does not come from English at all but from the Italian onza or oncia. Over the centuries many regions and trades used different ounces: the English Tower ounce of 29.16 g was abolished by Henry VIII in 1527, and the Dutch ons was redefined as exactly 100 g in 1820.
The avoirdupois ounce used for everyday goods is one sixteenth of a pound, exactly 28.349523125 g or 437.5 grains, the standard in the US and under the UK imperial system. It is not the same as the troy ounce for precious metals, and neither is the fluid ounce, which measures volume. Ounces still describe portions such as steaks and burgers, and they show up in unexpected places: fabric is graded by weight per area, so a 16 oz denim is a heavy cloth, and the copper on a circuit board is specified in ounces, where 1 oz is roughly 34.7 micrometres thick.
1 ounce = 0.02834952313 kilograms (approximately).
Sources: Wikipedia: Ounce; NIST Guide to the SI, Appendix B.8 (mass conversions)
Related conversions
- Ounces to stone (reverse)
- Stone to kilograms
- Stone to grams
- Stone to metric tons
- Stone to pounds
- Stone to milligrams
- Stone to micrograms
- Stone to carats
- Stone to short tons
- Stone to long tons
- Stone to troy ounces
- Kilograms to ounces
- Grams to ounces
- Metric tons to ounces
- Pounds to ounces
- Milligrams to ounces
- Micrograms to ounces
- Carats to ounces
- Short tons to ounces
- Long tons to ounces
- Troy ounces to ounces
- Daltons to ounces
- Earth masses to ounces
See all weight & mass units.