pmol/L to ng/dL Converter

By: Patrick Myers Patrick Myers is the CEO and Founder of Calculator Academy. He has over eight years of experience developing online calculators and holds a B.S. in Mechanical Engineering. His work focuses on formula implementation, calculator accuracy, unit conversions, and creating practical tools that are easy to use.

Last Updated: July 6, 2026
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This calculator was built with Calculator Academy’s community calculator studio with AI assistance, and was reviewed by the Calculator Academy team before publication.

About the pmol/L to ng/dL Converter

This converter changes a molar concentration in pmol/L into a mass concentration in ng/dL. It is useful for lab values such as testosterone, estradiol, progesterone, cortisol, T3, and T4, or for any compound when you know its molecular weight.

How to use this calculator

  1. Enter the concentration value in pmol/L.
  2. Select the compound preset that matches your analyte.
  3. Choose Custom molecular weight if your compound is not listed.
  4. Enter the molecular weight in g/mol when using a custom value or editing the preset value.
  5. Read the converted ng/dL result, conversion factor, ng/mL equivalent, and reverse factor.

How it works

The calculator uses the pmol/L concentration and the compound’s molecular weight in g/mol. Because pmol/L counts molecules by amount of substance and ng/dL measures mass per volume, the molecular weight is required to convert between the two.

The formula is ng/dL = pmol/L × molecular weight × 0.0001. The factor 0.0001 combines the metric unit changes from picomoles to nanograms and liters to deciliters.

The displayed conversion factor is molecular weight × 0.0001, meaning the number of ng/dL per 1 pmol/L. The ng/mL equivalent is calculated by dividing ng/dL by 100, and the reverse factor is 1 divided by the conversion factor.

This is a unit conversion only. Lab interpretation should be based on the reference interval and units provided by the testing laboratory.

Example calculation

For 1000 pmol/L of testosterone, use the testosterone preset molecular weight of 288.42 g/mol. The calculation is 1000 × 288.42 × 0.0001 = 28.842 ng/dL, which is also 0.28842 ng/mL.

Frequently asked questions

Why does the compound matter when converting pmol/L to ng/dL?

pmol/L is based on the number of molecules, while ng/dL is based on mass. Different molecules have different molecular weights, so the same pmol/L value converts to different ng/dL values.

What formula does this converter use?

It uses ng/dL = pmol/L × molecular weight × 0.0001, with molecular weight entered in g/mol.

Can I use this for compounds not in the preset list?

Yes. Select the custom molecular weight option or edit the molecular weight field, then enter the compound’s molecular weight in g/mol.

How do I convert ng/dL back to pmol/L?

Multiply the ng/dL value by the displayed reverse factor, which is 1 ÷ (molecular weight × 0.0001).

Is this the same as interpreting a lab result?

No. This only converts units. To understand whether a result is high, low, or normal, compare it with the laboratory’s reference range for that specific test.