A troy ounce is exactly 31.1034768 grams.
Troy ounces to Ounces Converter — oz t to oz
Convert Troy ounce (oz t) to Ounce (oz) using the exact conversion factor (1 troy ounce = 1.097142857 ounce). See the formula, worked examples, conversion table, history, and common uses.
Troy ounces to Ounces 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 avoirdupois ounce is 1/16 pound.
Result = input x 0.0311034768 / 0.02834952313.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Troy ounces to Ounces
Weight conversions between Troy ounce and Ounce 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. Specifically: A troy ounce is exactly 31.1034768 grams, and an avoirdupois ounce is 1/16 pound.
Formula
ounces = troy ounces × 1.09714285714
This factor comes from each unit's defined relationship to the category's base unit: 1 troy ounce equals 0.0311034768 base units, and 1 ounce equals 0.028349523125 base units, so dividing one by the other gives the direct troy ounce-to-ounce factor of 1.09714285714.
Simple example
1 oz t × 1.097142857 = 1.097142857 oz
1 troy ounce = 1.097142857 ounces.
Real-world example
50 oz t × 1.097142857 = 54.85714286 oz
50 troy ounces = 54.85714286 ounces.
Conversion table
| Troy ounce (oz t) | Ounce (oz) |
|---|---|
| 1 oz t | 1.097142857 oz |
| 5 oz t | 5.485714286 oz |
| 10 oz t | 10.97142857 oz |
| 25 oz t | 27.42857143 oz |
| 50 oz t | 54.85714286 oz |
| 100 oz t | 109.7142857 oz |
Reverse conversion: Ounce to Troy ounce
1.097142857 oz × 0.9114583333 = 0.9999999999 oz t
1.097142857 ounces = 0.9999999999 troy ounces.
troy ounces = ounces × 0.911458333333
For a page dedicated to this direction, see Ounce to Troy ounce.
Understanding the Troy ounce (oz t)
A troy ounce is exactly 31.1034768 grams.
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.
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 ounces are in 1 troy ounce?
1 troy ounce equals 1.097142857 ounces, using the exact defined conversion factor rather than an estimate.
How do I convert troy ounce to ounce?
Multiply the troy ounce value by 1.097142857. The converter above does this instantly to whatever precision you set.
How do I convert ounce back to troy ounce?
Use the reverse factor: 1 ounce equals 0.9114583333 troy ounces. You can also use the swap control in the converter above to flip the direction instantly.
What is a troy ounce?
Troy ounce (oz t) is a unit of mass/weight.
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.
Is the troy ounce to ounce 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.