Attogram is 1e-18 gram units.
Attograms to Troy ounces Converter — ag to oz t
Convert Attogram (ag) to Troy ounce (oz t) using the exact conversion factor (1 attogram = 3.215075e-20 troy ounce). See the formula, worked examples, conversion table, history, and common uses.
Attograms to Troy 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.
A troy ounce is exactly 31.1034768 grams.
Result = input x 1e-21 / 0.0311034768.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Attograms to Troy ounces
Weight conversions between Attogram and Troy 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. Attogram is most often used for nanotechnology and single-molecule mass measurement.
Formula
troy ounces = attograms × 3.215075e-20
This factor comes from each unit's defined relationship to the category's base unit: 1 attogram equals 1e-21 base units, and 1 troy ounce equals 0.0311034768 base units, so dividing one by the other gives the direct attogram-to-troy ounce factor of 3.215075e-20.
Simple example
1 ag × 3.215075e-20 = 3.215075e-20 oz t
1 attogram = 3.215075e-20 troy ounces.
Real-world example
50 ag × 3.215075e-20 = 1.607537e-18 oz t
50 attograms = 1.607537e-18 troy ounces.
Conversion table
| Attogram (ag) | Troy ounce (oz t) |
|---|---|
| 1 ag | 3.215075e-20 oz t |
| 5 ag | 1.607537e-19 oz t |
| 10 ag | 3.215075e-19 oz t |
| 25 ag | 8.037687e-19 oz t |
| 50 ag | 1.607537e-18 oz t |
| 100 ag | 3.215075e-18 oz t |
Reverse conversion: Troy ounce to Attogram
3.215075e-20 oz t × 3.110348e+19 = 1.000000107 ag
3.215075e-20 troy ounces = 1.000000107 attograms.
attograms = troy ounces × 3.110348e+19
For a page dedicated to this direction, see Troy ounce to Attogram.
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.
Understanding the Troy ounce (oz t)
A troy ounce is exactly 31.1034768 grams.
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 troy ounces are in 1 attogram?
1 attogram equals 3.215075e-20 troy ounces, using the exact defined conversion factor rather than an estimate.
How do I convert attogram to troy ounce?
Multiply the attogram value by 3.215075e-20. The converter above does this instantly to whatever precision you set.
How do I convert troy ounce back to attogram?
Use the reverse factor: 1 troy ounce equals 3.110348e+19 attograms. You can also use the swap control in the converter above to flip the direction instantly.
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.
What is a troy ounce?
Troy ounce (oz t) is a unit of mass/weight.
Is the attogram to troy ounce conversion exact?
Yes. Both attogram and troy ounce are defined by fixed standards rather than physical artifacts, so the factor of 3.215075e-20 used above is exact to as many digits as you choose to display.
Where is the attogram still used today?
Used in specialized scientific measurement, not everyday contexts