Milligrams to Attograms Converter
Enter the weight in milligrams below to convert it to attograms.
Convert Milligrams to Attograms
Enter a value in milligrams (mg) to convert to attograms (ag).
Milligram to Attogram Conversion Table
Table showing various milligram measurements converted to attograms. Click any preset value or arrow to load it into the converter.
| Milligrams (mg) | Attograms (ag) |
|---|---|
| 0.0000001 mg | 100,000,000 ag |
| 0.0000002 mg | 200,000,000 ag |
| 0.0000003 mg | 300,000,000 ag |
| 0.0000004 mg | 400,000,000 ag |
| 0.0000005 mg | 500,000,000 ag |
| 0.0000006 mg | 600,000,000 ag |
| 0.0000007 mg | 700,000,000 ag |
| 0.0000008 mg | 800,000,000 ag |
| 0.0000009 mg | 900,000,000 ag |
| 0.00000001 mg | 10,000,000 ag |
How to Convert Milligrams to Attograms
To convert milligrams to attograms, multiply the weight by the following conversion ratio: 1e+15 attograms/milligram.
Since one milligram is equal to 1e+15 attograms, you can use this simple formula to convert:
The weight in attograms is equal to the weight in milligrams multiplied by 1e+15.
For example, here's how to convert 5 milligrams to attograms using the formula above.
How Many Attograms Are in a Milligram?
There are 1e+15 attograms in a milligram, which is why we use this value in the formula above.
Our milligram to attogram calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Milligrams and attograms are both units used to measure weight. Keep reading to learn more about each unit.
What Is a Milligram?
A milligram is a unit of weight equal to 1/1,000,000 of a kilogram (0.000001 kg). One-thousandth of a gram (10⁻⁶ kg). [1]
The milligram is classified as a metric and SI-compatible unit of weight. Milligrams can be abbreviated as mg; for example, 1 milligram can be written as 1 mg.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the milligram (mg) a convenient decimal multiple of the gram (g).
In practice, milligrams (mg) 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 milligrams (mg) and attograms (ag), keep full floating-point precision (1 mg = 1e+15 ag; 1 ag = 1e-15 mg) during intermediate calculations and round only the final attogram figure to match your instrument tolerance.
More Milligram & Attogram Conversions
Need to calculate in the opposite direction? Use our attograms to milligrams calculator to switch your starting unit immediately. You can also explore related tools such as converting attograms to milligrams, converting milligrams to grams, or converting milligrams to micrograms.
Convert from Milligrams
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Mass)·Mass & Weight Metrology Standard — Milligrams (mg) to Attograms (ag)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Milligram (mg) & Attogram (ag)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (mg to ag)