Convert Ounce to Stone (US)
Convert ounces to stones (us) instantly. 1 ounce = 0.005 stone (us) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Stone (US) to Ounce converter for the reverse conversion.
Units explained
Ounce
The (avoirdupois) ounce (oz) equals one-sixteenth of a pound, about 28.35 grams.
From Latin 'uncia', meaning a twelfth part.
US food portions, postal weights, and boxing weight classes.
Standardized as 1/16 of the international pound from 1959.
Stone (US)
A less common US definition of the stone, about 5.67 kilograms.
A variant stone weight used in some historical US trade.
Rare; appears mainly in historical or specialized contexts.
Derived from older English stone weights that varied by commodity.
Ounce to Stone (US) conversion formula
The relationship between ounces and stones (us):
To convert ounces to stones (us), multiply the value in ounces by 0.005. To reverse, multiply stones (us) by 200.0000001764.
How to use this converter
Type a value into the calculator. The result in stones (us) updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Stone (US) to Ounce converter for the reverse direction.
Step-by-step: convert ounces to stones (us)
- Write down the value in ounces (oz).
- Multiply that value by the factor 0.005.
- The product is the equivalent value in stones (us) (st).
- To reverse, multiply the stone (us) value by 200.0000001764.
Worked examples
Example 1 — Convert 1 oz to st:
1 × 0.005 = 0.005 st
Example 2 — Convert 100 oz to st:
100 × 0.005 = 0.4999999996 st
Real-world example — Furniture and large objects
A 72-ounce piece of furniture converts to a value in stones (us) that's easier to mentally compare with room dimensions. This is the typical workflow when shopping internationally and product specs use a different unit than your room measurements.
72 oz × 0.005 = 0.3599999997 st
Real-world example — Children's height milestones
A 150-ounce-tall child measures a value in stones (us) that's commonly used for theme-park ride height requirements when travelling between countries that use different measurement units.
150 oz × 0.005 = 0.7499999993 st
Real-world example — Body height conversion
You enter your height as 180 ounces into an international job or visa application. The form then asks for the same value in stones (us) — converting between these adjacent units is one of the most-used length conversions globally.
180 oz × 0.005 = 0.8999999992 st
Ounce to Stone (US) conversion table
Standard reference values for converting ounces to stones (us):
| Ounce [oz] | Stone (US) [st] |
|---|---|
| 0.01 | 5e-5 |
| 0.1 | 0.0005 |
| 1 | 0.005 |
| 2 | 0.01 |
| 3 | 0.015 |
| 4 | 0.02 |
| 5 | 0.025 |
| 10 | 0.05 |
| 20 | 0.0999999999 |
| 30 | 0.1499999999 |
| 40 | 0.1999999998 |
| 50 | 0.2499999998 |
| 100 | 0.4999999996 |
| 500 | 2.4999999978 |
| 1000 | 4.9999999956 |
Frequently asked questions
How many stones (us) is 1 ounce?
How do I convert ounces to stones (us)?
How do I convert stones (us) back to ounces?
How many stones (us) is 100 ounces?
Popular weight unit conversions
Convert Ounce to other weight units
Show all Ounce conversions
Metric / SI (18 units)
Avoirdupois (14 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 oz = 0.005 st) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.