Ounces to Stones
Type a value in either box to convert between ounces and stones. The factor is 0.00446429.
| Ounces | Stones |
|---|---|
| 1 oz | 0.004464 st |
| 2 oz | 0.008929 st |
| 3 oz | 0.013393 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 |
How to use
- Enter a value in the Ounces field.
- The Stones figure appears immediately — no button to press.
- Typing in the Stones field converts back to Ounces the same way.
- Use the reference table for the values that come up most often.
Ounces to Stones formula
To convert ounces to stones, multiply by 0.00446428571.
st = oz × 0.00446428571
Put another way, one ounce is exactly 1/224 of a stone.
Why this factor: the ounce and the stone are both defined against the kilogram, so dividing one definition by the other gives 0.00446428571 directly. Both definitions are set out in full below.
To go the other way, divide by 0.00446428571 — or use the Stones to Ounces converter, which is the same calculation reversed.
Worked example
Start with 2 oz. Multiply by 0.00446428571 to get 0.008929 st.
2 oz × 0.00446428571 = 0.008929 st
The converter above does this for any value you type, in either direction.
What is an ounce?
An ounce is one sixteenth of a pound, used for small weights in the US.
Definition: Exactly 28.349523125 grams — one sixteenth of the international avoirdupois pound.
Where it is used: Food packaging, postal weights, and coffee and spice quantities in the US.
Worth knowing: Not the same as a fluid ounce, which measures volume. Also distinct from the troy ounce (31.103 g) used for gold and silver.
What is a stone?
A stone is fourteen pounds, still the customary unit for body weight in Britain and Ireland.
Definition: Fourteen avoirdupois pounds, so exactly 6.35029318 kilograms.
Where it is used: Personal body weight in the UK and Ireland, where weight is usually given as stones and pounds.
Worth knowing: Effectively unused in the United States, where body weight is quoted in pounds alone.
Ounces vs Stones
The ounce and the stone belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many stones are in an ounce?
One ounce equals 0.00446428571 stones.
What is the formula to convert ounces to stones?
Multiply the number of ounces by 0.00446428571. To reverse it, divide by 0.00446428571 instead.
How do I convert stones back to ounces?
Divide by 0.00446428571, which is the same as multiplying by 224.
How many stones are in 10 ounces?
10 oz works out to 0.044643 st.
Is there anything to watch out for with ounces?
Not the same as a fluid ounce, which measures volume. Also distinct from the troy ounce (31.103 g) used for gold and silver.
How is the ounce defined?
Exactly 28.349523125 grams — one sixteenth of the international avoirdupois pound.