Folate nmol/L → ng/mL
Convert folate from nmol/L to ng/mL
Sources last checked: 2026-11-03
Folate nmol/L → ng/mL
Convert folate from nmol/L to ng/mL
Converts units only; reference ranges depend on the laboratory, the assay and the patient.
What is the Folate nmol/L → ng/mL?
Many European laboratories report serum folate in nmol/L, while Turkey, the USA and many German-speaking laboratories use ng/mL (= µg/L). This converter divides by 2.266 (about × 0.441), the factor derived from the molar mass of folic acid (441.4 g/mol). The same factor applies to red-cell folate, but its reference values are different from serum.
When to use it
- Translating a nmol/L folate result into ng/mL
- Reading US or Turkish literature that reports folate in ng/mL
- Comparing results after a laboratory change
- Teaching and exam preparation
When not to use it
- Mixing serum and red-cell folate in one trend line, even after conversion
- Converting supplement doses — mg and µg are amounts, not concentrations
- Interpreting folate without the B12 status, because both cause megaloblastic anaemia
How it is calculated
Folate (ng/mL) = folate (nmol/L) ÷ 2.266
Clinical pearls and limitations
- Converts units only; reference ranges depend on the laboratory, the assay and the patient.
- 1 nmol/L ≈ 0.441 ng/mL; 30 nmol/L ≈ 13.2 ng/mL.
- Give ng/mL with one decimal.
- Fortified foods and supplements can raise serum folate within hours, so sampling conditions matter.
- Thresholds depend on assay, specimen and guideline; take them from the source in its original unit.
Frequently asked questions
How do I convert folate from nmol/L to ng/mL?
Divide by 2.266. For example, 30 nmol/L ÷ 2.266 = 13.2 ng/mL and 15 nmol/L ÷ 2.266 = 6.6 ng/mL.
What is 1 nmol/L of folate in ng/mL?
About 0.441 ng/mL, because one nanomole of folic acid weighs 441.4 ng and the result is per litre (1 ng/mL = 1000 ng/L).
Does red-cell folate use the same factor?
Yes, the molar factor is the same, but red-cell folate is measured in a different specimen and has its own reference intervals.
Evidence and guidelines
Have a follow-up question?
Medelix answers clinical questions from current guidelines and studies — every statement with its source.
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<p><a href="https://medelix.ai/en/calculators/folate-nmol-l-to-ng-ml">Folate nmol/L → ng/mL 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.