ng to mol Converter
To convert ng to mol, divide the value in nanograms by the molecular weight (g/mol), then divide by 1,000,000,000.
How to Convert ng to mol
This ng to mol converter changes a nanogram mass into moles. Enter the mass in ng and the molecular weight.
Divide nanograms by 1,000,000,000 to get grams, then divide by the molecular weight: mol = ng ÷ MW ÷ 109.
For example, 500 ng of testosterone (MW 288.431 g/mol) ≈ 1.734 × 10−9 mol.
mol = ng ÷ MW ÷ 1,000,000,000Divide the mass in ng by the molecular weight (g/mol), then divide by 1,000,000,000 (10⁹) to get moles.Conversion Formula
The formula to convert ng to mol is:
Where:
- ng = mass in nanograms (10⁻⁹ g)
- mol = amount in moles
- MW = molecular weight (molar mass) in g/mol
Conversion Table
Common ng to mol conversions are shown below. The last column uses testosterone (MW 288.431 g/mol) as an example.
| ng | mol (formula) | mol for testosterone |
|---|---|---|
| 0.01 | 1 × 10⁻¹¹ ÷ MW | 3.46703371 × 10⁻¹⁴ |
| 0.1 | 1 × 10⁻¹⁰ ÷ MW | 3.46703371 × 10⁻¹³ |
| 0.33 | 3.3 × 10⁻¹⁰ ÷ MW | 1.144121124 × 10⁻¹² |
| 0.5 | 5 × 10⁻¹⁰ ÷ MW | 1.733516855 × 10⁻¹² |
| 1 | 1 × 10⁻⁹ ÷ MW | 3.46703371 × 10⁻¹² |
| 2.5 | 2.5 × 10⁻⁹ ÷ MW | 8.667584275 × 10⁻¹² |
| 5 | 5 × 10⁻⁹ ÷ MW | 1.733516855 × 10⁻¹¹ |
| 10 | 1 × 10⁻⁸ ÷ MW | 3.46703371 × 10⁻¹¹ |
| 33 | 3.3 × 10⁻⁸ ÷ MW | 1.144121124 × 10⁻¹⁰ |
| 50 | 5 × 10⁻⁸ ÷ MW | 1.733516855 × 10⁻¹⁰ |
| 100 | 1 × 10⁻⁷ ÷ MW | 3.46703371 × 10⁻¹⁰ |
| 250 | 2.5 × 10⁻⁷ ÷ MW | 8.667584275 × 10⁻¹⁰ |
| 500 | 5 × 10⁻⁷ ÷ MW | 1.733516855 × 10⁻⁹ |
| 1,000 | 0.000001 ÷ MW | 3.46703371 × 10⁻⁹ |
Worked Examples
Here are some common examples of ng to mol conversion, using testosterone (MW 288.431 g/mol):
- 3.46703371 × 10⁻¹² mol = 1 ng
- 1.733516855 × 10⁻¹¹ mol = 5 ng
- 1.144121124 × 10⁻¹⁰ mol = 33 ng
- 3.46703371 × 10⁻¹⁰ mol = 100 ng
Unit Definitions
What is a nanogram (ng)?
A nanogram (ng) is a unit of mass equal to 10⁻⁹ gram.
The prefix nano- (n) means 10⁻⁹, or one billionth. So 1 ng = 0.000000001 g.
What is a mole (mol)?
The mole (mol) is the SI base unit for amount of substance. It counts particles, such as atoms, molecules or ions.
Since 2019, one mole contains exactly 6.02214076 × 1023 particles. This number is the Avogadro constant.
Why Is Molecular Weight Needed?
Moles count particles. Grams measure mass. One particle of each substance has its own mass, so the link between them is the molecular weight (MW), also called molar mass.
MW tells you how many grams one mole of a substance weighs. For example, one mole of water weighs about 18.015 g, while one mole of glucose weighs about 180.16 g.
Therefore, to convert ng to mol, you divide by MW, then divide by 1,000,000,000. The extra step (÷ 1,000,000,000) only adjusts for the different sizes of the two units.
Uses and Importance of ng and mol
Converting a nanogram amount into moles is useful when you need the number of molecules, or when a formula needs moles.
Hormone chemistry
Steroid hormones are measured in nanograms in many assays. Converting to moles lets you compare different hormones molecule for molecule.
Receptor studies
Binding experiments count molecules, so masses are converted to moles first.
Unit conversion in reports
Lab reports in ng/dL or ng/mL can be linked to molar units once you know the molecular weight.
Frequently Asked Questions (FAQ)
What is 1 ng of testosterone in mol?
1 ÷ 288.431 ÷ 109 ≈ 3.467 × 10−12 mol.
Why is testosterone reported in ng/dL or nmol/L?
Some labs use mass units (ng/dL) and others use molar units (nmol/L). Labcorp's table lists a factor of 0.0347 to convert ng/dL to nmol/L.
Would nmol be easier to read?
Yes. ng ÷ MW gives the answer directly in nmol. For 500 ng of testosterone that is about 1.73 nmol.
Does this work for proteins?
Yes, if you use the protein's molecular weight in g/mol. Proteins have much larger molecular weights, so the same mass gives far fewer moles.
Why does the converter show powers of ten?
Nanogram amounts are tiny in moles, often below 10−6. Scientific notation avoids long rows of zeros.
Other Related Tools
Accuracy and Scope
The result depends on the molecular weight entered. Testosterone's molecular weight here is based on its formula C₁₉H₂₈O₂ and standard atomic weights.
This converter does not interpret hormone results.
Sources