Ounces to Stone Converter

About the oz to st calculation

One ounce is exactly 0.00446429 stone, so converting between them is a single multiplication. Enter any value above and the result updates as you type. Common in US recipes and for postal weights. Not the same as a fluid ounce. A British unit of exactly 14 pounds, still the normal way to state bodyweight in the UK.

Formula

st = oz × 0.00446429

1 oz = 0.00446429 st
1 st = 224 oz

Worked example

To convert 16 oz, multiply by 0.00446429: 16 × 0.00446429 = 0.071429 st.

Frequently asked questions

How many stone are in a ounce?

There are 0.00446429 stone in one ounce. To convert any amount, multiply the number of ounces by 0.00446429.

How do I convert stone back to ounces?

Divide instead of multiplying, or equivalently multiply by 224. One stone is 224 ounces.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between ounces and stone is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.

Where is each of these units used?

Ounces: common in US recipes and for postal weights. Not the same as a fluid ounce. Stone: a British unit of exactly 14 pounds, still the normal way to state bodyweight in the UK.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units