Stone to Ounces Converter

Stone to Ounces

Convert stone (st) to ounces (oz). Both measure mass and weight, and the conversion comes up in cooking, shipping, fitness work.

The Formula

`` ounces = stone × 224 stone = ounces × 0.00446428571429 `

One stone is 224 ounces, and one ounce is 0.004464 stone.

Conversion Table

Stone	Ounces
1 st	224 oz
2 st	448 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
500 st	112,000 oz
1,000 st	224,000 oz

The Other Direction

Ounces	Stone
1 oz	0.004464 st
2 oz	0.008929 st
5 oz	0.022321 st
10 oz	0.044643 st
25 oz	0.111607 st
50 oz	0.223214 st
100 oz	0.446429 st
500 oz	2.2321 st
1,000 oz	4.4643 st

What Each Unit Is

Stone (st) — exactly 14 pounds, or 6.35029318 kilograms. A medieval trade weight that varied by commodity until standardised at 14 lb in 1835.

Ounces (oz) — one sixteenth of a pound, or exactly 28.349523125 grams. From uncia, one twelfth — of the Roman libra, before avoirdupois moved it to one sixteenth.

A Sense of Scale

• British body weight is often given in stone and pounds
• An adult is typically 9–14 stone
• A slice of bread is about 1 oz
• A tennis ball is 2 oz
• US recipes use ounces for dry goods

Precision

The factor 224 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.

Watch Out For

• Effectively British-only. US sources give body weight in pounds alone.
• A fluid ounce measures volume, not mass, and the two are only interchangeable for water by coincidence of scale.

In Code

`javascript const stoneToOunce = (value) => value * 224; ``

Where This Conversion Comes Up

• Cooking
• Shipping
• Fitness
• Medicine
• Manufacturing

How Many Decimals Do You Need?

Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 st with the factor truncated at each decimal place:

Decimals kept	Factor	137 st becomes	Error
0	224	30,688	—
1	224	30,688	—
2	224	30,688	—
3	224	30,688	—
4	224	30,688	—

A rule that holds for any conversion: round once, at the end. Rounding the factor and then multiplying compounds the error through every subsequent calculation, while carrying full precision and rounding the final answer does not.

The right number of significant figures is set by your input, not by the converter. If you measured stone to three significant figures, the answer in ounces is only good to three — writing more digits claims precision the measurement never had.