pg to pmol Converter
To convert pg to pmol, divide the value in picograms by the molecular weight (g/mol).
How to Convert pg to pmol
This pg to pmol converter changes picograms into picomoles. Enter the mass in pg and the molecular weight.
With matching prefixes, the rule is simply pmol = pg ÷ molecular weight.
For example, 150 pg of estradiol (MW 272.388 g/mol) ≈ 0.5507 pmol.
pmol = pg ÷ MWDivide the mass in picograms by the molecular weight (g/mol) to get picomoles.Conversion Formula
The formula to convert pg to pmol is:
Where:
- pg = mass in picograms (10⁻¹² g)
- pmol = amount in picomoles (10⁻¹² mol)
- MW = molecular weight (molar mass) in g/mol
Conversion Table
Common pg to pmol conversions are shown below. The last column uses estradiol (MW 272.388 g/mol) as an example.
| pg | pmol (formula) | pmol for estradiol |
|---|---|---|
| 0.01 | 0.01 ÷ MW | 0.00003671233681 |
| 0.1 | 0.1 ÷ MW | 0.0003671233681 |
| 0.33 | 0.33 ÷ MW | 0.001211507115 |
| 0.5 | 0.5 ÷ MW | 0.001835616841 |
| 1 | 1 ÷ MW | 0.003671233681 |
| 2.5 | 2.5 ÷ MW | 0.009178084203 |
| 5 | 5 ÷ MW | 0.01835616841 |
| 10 | 10 ÷ MW | 0.03671233681 |
| 33 | 33 ÷ MW | 0.1211507115 |
| 50 | 50 ÷ MW | 0.1835616841 |
| 100 | 100 ÷ MW | 0.3671233681 |
| 250 | 250 ÷ MW | 0.9178084203 |
| 500 | 500 ÷ MW | 1.835616841 |
| 1,000 | 1,000 ÷ MW | 3.671233681 |
Worked Examples
Here are some common examples of pg to pmol conversion, using estradiol (MW 272.388 g/mol):
- 0.003671233681 pmol = 1 pg
- 0.01835616841 pmol = 5 pg
- 0.1211507115 pmol = 33 pg
- 0.3671233681 pmol = 100 pg
Unit Definitions
What is a picogram (pg)?
A picogram (pg) is a unit of mass equal to 10⁻¹² gram.
The prefix pico- (p) means 10⁻¹², or one trillionth. So 1 pg = 0.000000000001 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 pg to pmol, you divide by MW. Both units use the same prefix size, so no extra step is needed.
Uses and Importance of pg and pmol
pg to pmol is the core step in changing a hormone result from pg/mL into pmol/L.
Estradiol reporting
Estradiol is reported in pg/mL in some labs and pmol/L in others. Labcorp lists a factor of 3.67 from pg/mL to pmol/L.
Comparing hormones
Converting pg to pmol compares hormones with different molecular weights by molecule count.
Research data
Many binding studies need molar amounts; pg values are converted first.
Frequently Asked Questions (FAQ)
How many pmol are in 1 pg of estradiol?
1 ÷ 272.388 ≈ 0.003671 pmol.
Why is the pg/mL to pmol/L factor for estradiol about 3.67?
pg/mL × 1,000 gives pg/L, and dividing by 272.388 gives pmol/L. 1,000 ÷ 272.388 ≈ 3.67.
Does the same factor work for other hormones?
No. Each hormone has its own molecular weight, so each has its own factor.
Is 1 pg of estradiol more or less than 1 pmol?
Much less. 1 pmol of estradiol weighs about 272.388 pg.
Does this interpret estradiol levels?
No. It converts units only.
Other Related Tools
Accuracy and Scope
The result depends on the molecular weight you enter.
This tool does not interpret hormone results.
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