MedeliX
Start asking

Progesterone ng/mL → nmol/L

Convert progesterone from ng/mL to nmol/L

Sources last checked: 2026-11-03

Progesterone ng/mL → nmol/L

Convert progesterone from ng/mL to nmol/L

Fill in every field to see the result.

Converts units only; reference ranges depend on the laboratory, the assay and the patient.

Source: AMA Manual of Style, 11th ed. (Oxford Academic) — Units of measure converter, Table 2: Selected laboratory tests and conversion factors.Open

What is the Progesterone ng/mL → nmol/L?

Serum progesterone is reported in ng/mL in Germany, Austria, Turkey and the USA and in nmol/L in the UK and many other European laboratories. This converter multiplies by 3.180, which follows from the molar mass of progesterone (314.5 g/mol). It is used mainly to confirm ovulation, in fertility treatment and in early pregnancy.

When to use it

  • Comparing a ng/mL progesterone with European fertility literature in nmol/L
  • Reading British guidance or papers on luteal-phase testing
  • Comparing results from different laboratories during fertility treatment
  • Exam preparation

When not to use it

  • 17-hydroxyprogesterone, which is a different steroid with a different molar mass
  • Dydrogesterone or other synthetic progestogens, which progesterone assays do not measure
  • Interpreting a value without knowing the cycle day relative to the next menstruation

How it is calculated

Progesterone (nmol/L) = progesterone (ng/mL) × 3.180

Clinical pearls and limitations

  • Converts units only; reference ranges depend on the laboratory, the assay and the patient.
  • 1 ng/mL ≈ 3.180 nmol/L; 8 ng/mL ≈ 25.4 nmol/L.
  • Luteal progesterone is secreted in pulses, so single values fluctuate considerably.
  • To confirm ovulation, timing is counted back from the expected next menstruation, not forward from a fixed cycle day; irregular cycles need repeated sampling.
  • With vaginal progesterone, serum levels do not reflect uterine tissue levels; thresholds depend on the clinical setting, assay and guideline.

Frequently asked questions

How do I convert progesterone from ng/mL to nmol/L?

Multiply by 3.180. For example, 8 ng/mL × 3.180 = 25.4 nmol/L and 15 ng/mL × 3.180 = 47.7 nmol/L.

Why is the progesterone factor 3.180?

Progesterone has a molar mass of 314.5 g/mol. 1 ng/mL is 1000 ng/L, and 1000 ÷ 314.5 = 3.180 nmol/L.

When in the cycle should progesterone be measured?

For ovulation confirmation it is measured in the mid-luteal phase, timed relative to the expected next period. The exact day and the interpretation threshold come from the guideline or laboratory you use.

Evidence and guidelines

  1. Primary source: AMA Manual of Style, 11th ed. (Oxford Academic) — Units of measure converter, Table 2: Selected laboratory tests and conversion factors.
  2. PubChem compound summary: progesterone (CID 5994), molecular weight 314.5 g/mol.

Have a follow-up question?

Medelix answers clinical questions from current guidelines and studies — every statement with its source.

Related calculators

Embed this calculatorFree to use on your website, intranet or teaching page. Copy the code below.
<iframe src="https://medelix.ai/en/embed/progesterone-ngml-to-nmol" title="Progesterone ng/mL → nmol/L – Medelix" width="100%" height="620" style="border:0;max-width:720px" loading="lazy"></iframe> <p><a href="https://medelix.ai/en/calculators/progesterone-ng-ml-to-nmol-l">Progesterone ng/mL → nmol/L calculator by Medelix</a></p>

For healthcare professionals and medical students. These tools support, and do not replace, clinical judgement. Always check results against the original source and your local protocols.