ng to pmol Converter
To convert ng to pmol, divide the value in nanograms by the molecular weight (g/mol), then multiply by 1,000.
How to Convert ng to pmol
This ng to pmol converter changes nanograms into picomoles. Enter the mass in ng and the molecular weight.
ng ÷ MW gives nanomoles. Multiply by 1,000 to get picomoles: pmol = ng ÷ MW × 1,000.
For example, 2 ng of testosterone (MW 288.431 g/mol) ≈ 6.934 pmol.
pmol = ng ÷ MW × 1,000Divide the mass in ng by the molecular weight (g/mol), then multiply by 1,000 to get picomoles.Conversion Formula
The formula to convert ng to pmol is:
Where:
- ng = mass in nanograms (10⁻⁹ g)
- pmol = amount in picomoles (10⁻¹² mol)
- MW = molecular weight (molar mass) in g/mol
Conversion Table
Common ng to pmol conversions are shown below. The last column uses testosterone (MW 288.431 g/mol) as an example.
| ng | pmol (formula) | pmol for testosterone |
|---|---|---|
| 0.01 | 10 ÷ MW | 0.0346703371 |
| 0.1 | 100 ÷ MW | 0.346703371 |
| 0.33 | 330 ÷ MW | 1.144121124 |
| 0.5 | 500 ÷ MW | 1.733516855 |
| 1 | 1,000 ÷ MW | 3.46703371 |
| 2.5 | 2,500 ÷ MW | 8.667584275 |
| 5 | 5,000 ÷ MW | 17.33516855 |
| 10 | 10,000 ÷ MW | 34.6703371 |
| 33 | 33,000 ÷ MW | 114.4121124 |
| 50 | 50,000 ÷ MW | 173.3516855 |
| 100 | 100,000 ÷ MW | 346.703371 |
| 250 | 250,000 ÷ MW | 866.7584275 |
| 500 | 500,000 ÷ MW | 1,733.516855 |
| 1,000 | 1,000,000 ÷ MW | 3,467.03371 |
Worked Examples
Here are some common examples of ng to pmol conversion, using testosterone (MW 288.431 g/mol):
- 3.46703371 pmol = 1 ng
- 17.33516855 pmol = 5 ng
- 114.4121124 pmol = 33 ng
- 346.703371 pmol = 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 picomole (pmol)?
A picomole (pmol) is a unit of amount of substance equal to 10⁻¹² mole.
The prefix pico- (p) means 10⁻¹², or one trillionth. So 1 pmol = 0.000000000001 mol.
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 pmol, you divide by MW, then multiply by 1,000. The extra step (× 1,000) only adjusts for the different sizes of the two units.
Uses and Importance of ng and pmol
ng to pmol is common when a small mass must be expressed as a number of molecules for binding or detection work.
DNA work
Mass of DNA in ng is converted to pmol for ligation and library preparation, using the DNA's molecular weight (about 650 g/mol per base pair on average, per NEB).
Steroid assays
Steroid standards in ng can be converted to pmol for molar reporting.
Peptide mass spectrometry
Peptide amounts in ng are converted to pmol to judge instrument load.
Frequently Asked Questions (FAQ)
How many pmol are in 1 ng of testosterone?
1 ÷ 288.431 × 1,000 ≈ 3.467 pmol.
Why is there a × 1,000 after dividing by MW?
ng ÷ MW gives nmol, and each nmol is 1,000 pmol.
How do I convert ng of DNA to pmol?
Work out the DNA's molecular weight (base pairs × about 650 g/mol for double-stranded DNA), then use pmol = ng ÷ MW × 1,000.
How many pmol is 100 ng of a 1,000 bp DNA fragment?
MW ≈ 1,000 × 650 = 650,000 g/mol. 100 ÷ 650,000 × 1,000 ≈ 0.154 pmol, or about 154 fmol.
Does this interpret testosterone results?
No. It converts units only.
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Accuracy and Scope
The result depends on the molecular weight you enter. For DNA, the 650 g/mol per base pair figure is an average.
This tool does not interpret hormone results.
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