An avoirdupois ounce is 1/16 pound.
Ounces to Imperial hundredweights Converter — oz to long cwt
Convert Ounce (oz) to Imperial hundredweight (long cwt) using the exact conversion factor (1 ounce = 0.0005580357 imperial hundredweight). See the formula, worked examples, conversion table, history, and common uses.
Ounces to Imperial hundredweights converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
An imperial long hundredweight is 112 pounds.
Result = input x 0.02834952313 / 50.80234544.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Ounces to Imperial hundredweights
Weight conversions between Ounce and Imperial hundredweight come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Ounce is most often used for us cooking and recipe measurement (small quantities).
Formula
imperial hundredweights = ounces × 0.000558035714286
This factor comes from each unit's defined relationship to the category's base unit: 1 ounce equals 0.028349523125 base units, and 1 imperial hundredweight equals 50.80234544 base units, so dividing one by the other gives the direct ounce-to-imperial hundredweight factor of 0.000558035714286.
Simple example
1 oz × 0.0005580357143 = 0.0005580357 long cwt
1 ounce = 0.0005580357 imperial hundredweights.
Real-world example
50 oz × 0.0005580357143 = 0.0279017857 long cwt
50 ounces = 0.0279017857 imperial hundredweights.
Conversion table
| Ounce (oz) | Imperial hundredweight (long cwt) |
|---|---|
| 1 oz | 0.0005580357 long cwt |
| 5 oz | 0.0027901786 long cwt |
| 10 oz | 0.0055803571 long cwt |
| 25 oz | 0.0139508929 long cwt |
| 50 oz | 0.0279017857 long cwt |
| 100 oz | 0.0558035714 long cwt |
Reverse conversion: Imperial hundredweight to Ounce
0.0005580357 long cwt × 1792 = 0.9999999744 oz
0.0005580357 imperial hundredweights = 0.9999999744 ounces.
ounces = imperial hundredweights × 1792
For a page dedicated to this direction, see Imperial hundredweight to Ounce.
Understanding the Ounce
Ounce (oz) measures mass. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. It is classified as a US/imperial customary unit.
Where it's used: United States (cooking, postal, retail) United Kingdom (informal/retail use)
Avoirdupois ounce vs. troy ounce. The everyday ounce (avoirdupois, 28.35 g) used for cooking and shipping is a different, smaller unit than the troy ounce (31.10 g) used for precious metals like gold and silver — this page uses the everyday avoirdupois ounce.
Uses of the Ounce today
- US cooking and recipe measurement (small quantities)
- US postal and shipping weight
- Precious metals (troy ounce, a related but distinct unit)
History of the Ounce
The ounce descends from the Roman 'uncia' (a twelfth part), inherited through medieval English weight systems; the avoirdupois ounce (for general goods, as opposed to the troy ounce for precious metals) became standard for everyday trade, fixed at exactly 28.349523125 g via the pound's 1959 international standardization.
Historical origin. Ounce was not the invention of a single named person; it developed through the process described above.
Understanding the Imperial hundredweight (long cwt)
An imperial long hundredweight is 112 pounds.
Ounce — sources
- NIST — International yard and pound (1959) — Basis for the modern ounce via the standardized pound.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many imperial hundredweights are in 1 ounce?
1 ounce equals 0.0005580357 imperial hundredweights, using the exact defined conversion factor rather than an estimate.
How do I convert ounce to imperial hundredweight?
Multiply the ounce value by 0.0005580357143. The converter above does this instantly to whatever precision you set.
How do I convert imperial hundredweight back to ounce?
Use the reverse factor: 1 imperial hundredweight equals 1,792 ounces. You can also use the swap control in the converter above to flip the direction instantly.
What is a ounce?
Ounce (oz) measures mass. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. It is classified as a US/imperial customary unit.
What is a imperial hundredweight?
Imperial hundredweight (long cwt) is a unit of mass/weight.
Is the ounce to imperial hundredweight conversion exact?
Yes. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between avoirdupois ounce vs. troy ounce?
The everyday ounce (avoirdupois, 28.35 g) used for cooking and shipping is a different, smaller unit than the troy ounce (31.10 g) used for precious metals like gold and silver — this page uses the everyday avoirdupois ounce.
Where is the ounce still used today?
United States (cooking, postal, retail) United Kingdom (informal/retail use)