Grams to Attograms Converter
Enter the weight in grams below to convert it to attograms.
Convert Grams to Attograms
Enter a value in grams (g) to convert to attograms (ag).
Gram to Attogram Conversion Table
Table showing various gram measurements converted to attograms. Click any preset value or arrow to load it into the converter.
| Grams (g) | Attograms (ag) |
|---|---|
| 0.0000001 g | 100,000,000,000.00002 ag |
| 0.0000002 g | 200,000,000,000.00003 ag |
| 0.0000003 g | 300,000,000,000 ag |
| 0.0000004 g | 400,000,000,000.00006 ag |
| 0.0000005 g | 500,000,000,000.00006 ag |
| 0.0000006 g | 600,000,000,000 ag |
| 0.0000007 g | 700,000,000,000 ag |
| 0.0000008 g | 800,000,000,000.0001 ag |
| 0.0000009 g | 900,000,000,000.0001 ag |
| 0.00000001 g | 10,000,000,000.000002 ag |
How to Convert Grams to Attograms
To convert grams to attograms, multiply the weight by the following conversion ratio: 1e+18 attograms/gram.
Since one gram is equal to 1e+18 attograms, you can use this simple formula to convert:
The weight in attograms is equal to the weight in grams multiplied by 1e+18.
For example, here's how to convert 5 grams to attograms using the formula above.
How Many Attograms Are in a Gram?
There are 1e+18 attograms in a gram, which is why we use this value in the formula above.
Our gram to attogram calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Grams and attograms are both units used to measure weight. Keep reading to learn more about each unit.
What Is a Gram?
A gram is a unit of weight equal to 1/1,000 of a kilogram (0.001 kg). Metric unit equal to one-thousandth of a kilogram (0.001 kg). [1]
The gram is classified as a metric and SI-compatible unit of weight. Grams can be abbreviated as g; for example, 1 gram can be written as 1 g.
When working with grams (g) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, grams (g) are widely used across fine-tolerance laboratory, analytical, and micro-scale weight measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is an Attogram?
An attogram is a unit of weight equal to 1/1,000,000,000,000,000,100,000 of a kilogram (1e-21 kg). 10⁻²¹ kilograms. [2]
The attogram is classified as a metric and SI-compatible unit of weight. Attograms can be abbreviated as ag; for example, 1 attogram can be written as 1 ag.
When working with attograms (ag) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, attograms (ag) are widely used across fine-tolerance laboratory, analytical, and micro-scale weight measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting weight between grams (g) and attograms (ag), keep full floating-point precision (1 g = 1e+18 ag; 1 ag = 1e-18 g) during intermediate calculations and round only the final attogram figure to match your instrument tolerance.
More Gram & Attogram Conversions
Need to calculate in the opposite direction? Use our attograms to grams calculator to switch your starting unit immediately. You can also explore related tools such as converting attograms to grams, converting grams to ounces, or converting grams to kilograms.
Convert from Grams
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Mass)·Mass & Weight Metrology Standard — Grams (g) to Attograms (ag)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Gram (g) & Attogram (ag)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (g to ag)