A troy ounce is exactly 31.1034768 grams.
Troy ounces to Attograms Converter — oz t to ag
Convert Troy ounce (oz t) to Attogram (ag) using the exact conversion factor (1 troy ounce = 3.110348e+19 attogram). See the formula, worked examples, conversion table, history, and common uses.
Troy ounces to Attograms 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.
Attogram is 1e-18 gram units.
Result = input x 0.0311034768 / 1e-21.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Troy ounces to Attograms
Weight conversions between Troy ounce and Attogram 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 attogram is 1e-18 gram units.
Formula
attograms = troy ounces × 3.110348e+19
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 attogram equals 1e-21 base units, so dividing one by the other gives the direct troy ounce-to-attogram factor of 3.110348e+19.
Simple example
1 oz t × 3.110348e+19 = 3.110348e+19 ag
1 troy ounce = 3.110348e+19 attograms.
Real-world example
50 oz t × 3.110348e+19 = 1.555174e+21 ag
50 troy ounces = 1.555174e+21 attograms.
Conversion table
| Troy ounce (oz t) | Attogram (ag) |
|---|---|
| 1 oz t | 3.110348e+19 ag |
| 5 oz t | 1.555174e+20 ag |
| 10 oz t | 3.110348e+20 ag |
| 25 oz t | 7.775869e+20 ag |
| 50 oz t | 1.555174e+21 ag |
| 100 oz t | 3.110348e+21 ag |
Reverse conversion: Attogram to Troy ounce
3.110348e+19 ag × 3.215075e-20 = 1.000000103 oz t
3.110348e+19 attograms = 1.000000103 troy ounces.
troy ounces = attograms × 3.215075e-20
For a page dedicated to this direction, see Attogram to Troy ounce.
Understanding the Troy ounce (oz t)
A troy ounce is exactly 31.1034768 grams.
Understanding the Attogram
Attogram (ag) measures mass. An attogram is 10⁻¹⁸ grams (10⁻²¹ kilograms) — 'atto-' is the SI prefix for one quintillionth. It is classified as a SI derived (metric prefix) unit.
Where it's used: Used in specialized scientific measurement, not everyday contexts
Uses of the Attogram today
- Nanotechnology and single-molecule mass measurement
- Analytical chemistry at extremely small mass scales
- Comparing against atomic-scale mass units like the atomic mass unit
History of the Attogram
The attogram is simply the gram combined with the SI prefix 'atto-' (10⁻¹⁸), one of the small-scale metric prefixes introduced by the International Committee for Weights and Measures as part of the broader SI prefix system, not a unit with its own separate history.
Historical origin. Attogram was not the invention of a single named person; it developed through the process described above.
Attogram — sources
- BIPM SI Brochure — SI prefixes — Defines 'atto-' as the prefix for 10⁻¹⁸.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many attograms are in 1 troy ounce?
1 troy ounce equals 3.110348e+19 attograms, using the exact defined conversion factor rather than an estimate.
How do I convert troy ounce to attogram?
Multiply the troy ounce value by 3.110348e+19. The converter above does this instantly to whatever precision you set.
How do I convert attogram back to troy ounce?
Use the reverse factor: 1 attogram equals 3.215075e-20 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 attogram?
Attogram (ag) measures mass. An attogram is 10⁻¹⁸ grams (10⁻²¹ kilograms) — 'atto-' is the SI prefix for one quintillionth. It is classified as a SI derived (metric prefix) unit.
Is the troy ounce to attogram conversion exact?
Yes. Both troy ounce and attogram are defined by fixed standards rather than physical artifacts, so the factor of 3.110348e+19 used above is exact to as many digits as you choose to display.