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Testosterone ng/dL → nmol/L

Convert testosterone from ng/dL to nmol/L

Sources last checked: 2026-11-03

Testosterone ng/dL → nmol/L

Convert testosterone from ng/dL to nmol/L

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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 Testosterone ng/dL → nmol/L?

Total testosterone is reported in ng/dL in the USA and Turkey and in nmol/L in the UK and many European laboratories; several German and Austrian laboratories use ng/mL instead. This converter multiplies by 0.03467, which follows from the molar mass of testosterone (288.4 g/mol). It converts total testosterone; free testosterone is reported in different, smaller units.

When to use it

  • Comparing a ng/dL result with European andrology or endocrine guidelines that use nmol/L
  • Calculating free or bioavailable testosterone with tools that require nmol/L together with SHBG
  • Reading European literature on hypogonadism, PCOS or androgen therapy
  • Exam questions mixing unit systems

When not to use it

  • Results in ng/mL — multiply by 100 to get ng/dL first, or the result will be off by a factor of 100
  • Free testosterone (pg/mL or pmol/L), which needs its own conversion
  • Dihydrotestosterone or DHEA-S, which have different molar masses

How it is calculated

Testosterone (nmol/L) = testosterone (ng/dL) × 0.03467

Clinical pearls and limitations

  • Converts units only; reference ranges depend on the laboratory, the assay and the patient.
  • 1 ng/dL ≈ 0.0347 nmol/L; 450 ng/dL ≈ 15.6 nmol/L.
  • 1 ng/mL = 100 ng/dL — check which mass unit the report uses.
  • Immunoassays are imprecise at low concentrations (women, children, suppressed men); LC-MS/MS is preferred there.
  • Testosterone varies with time of day and nutritional state; reference ranges depend on assay, sex, age and sampling conditions.

Frequently asked questions

How do I convert testosterone from ng/dL to nmol/L?

Multiply by 0.03467. For example, 450 ng/dL × 0.03467 = 15.6 nmol/L and 150 ng/dL × 0.03467 = 5.2 nmol/L.

Why is the testosterone factor 0.03467?

Testosterone has a molar mass of 288.4 g/mol. 1 ng/dL is 10 ng/L, and 10 ÷ 288.4 = 0.03467 nmol/L.

My German lab report gives testosterone in ng/mL — what now?

Multiply by 100 to get ng/dL (1 mL = 0.01 dL), then convert, or multiply ng/mL directly by 3.467 to get nmol/L.

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: testosterone (CID 6013), molecular weight 288.4 g/mol.

Have a follow-up question?

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

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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.