Attogram is 1e-18 gram units.
Attograms to Picograms Converter — ag to pg
Convert Attogram (ag) to Picogram (pg) using the exact conversion factor (1 attogram = 0.000001 picogram). See the formula, worked examples, conversion table, history, and common uses.
Attograms to Picograms 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.
Picogram is 1e-12 gram units.
Result = input x 1e-21 / 1e-15.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Attograms to Picograms
Weight conversions between Attogram and Picogram 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
picograms = attograms × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 attogram equals 1e-21 base units, and 1 picogram equals 1e-15 base units, so dividing one by the other gives the direct attogram-to-picogram factor of 0.000001.
Simple example
1 ag × 0.000001 = 0.000001 pg
1 attogram = 0.000001 picograms.
Real-world example
50 ag × 0.000001 = 0.00005 pg
50 attograms = 0.00005 picograms.
Conversion table
| Attogram (ag) | Picogram (pg) |
|---|---|
| 1 ag | 0.000001 pg |
| 5 ag | 0.000005 pg |
| 10 ag | 0.00001 pg |
| 25 ag | 0.000025 pg |
| 50 ag | 0.00005 pg |
| 100 ag | 0.0001 pg |
Reverse conversion: Picogram to Attogram
0.000001 pg × 1000000 = 1 ag
0.000001 picograms = 1 attogram.
attograms = picograms × 1000000
For a page dedicated to this direction, see Picogram 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 Picogram (pg)
Picogram is 1e-12 gram units.
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 picograms are in 1 attogram?
1 attogram equals 0.000001 picograms, using the exact defined conversion factor rather than an estimate.
How do I convert attogram to picogram?
Multiply the attogram value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert picogram back to attogram?
Use the reverse factor: 1 picogram equals 1,000,000 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 picogram?
Picogram (pg) is a unit of mass/weight.
Is the attogram to picogram conversion exact?
Yes. Both attogram and picogram are defined by fixed standards rather than physical artifacts, so the factor of 0.000001 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