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Folate Unit Converter
Converts folate between ng/mL and nmol/L using the factor derived from its molar mass. 1 ng/mL = 2.26553 nmol/L.
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In short
Folate is reported in ng/mL in some countries and nmol/L in others, and the two are related by a fixed factor: 1 ng/mL = 2.26553 nmol/L, so to go the other way you divide by 0.441398. 4 ng/mL is 9.1 nmol/L; 10 ng/mL is 22.7 nmol/L; 20 ng/mL is 45.3 nmol/L. The factor is not arbitrary — it comes from the molar mass, because folic acid has a molar mass of 441.4 g/mol, and that is why every analyte has its own factor rather than one shared conversion. Serum folate and red cell folate are reported in the same units and convert with the same factor, but they are not interchangeable measurements — red cell folate reflects months of intake and serum folate reflects days. Converting the units correctly does not make the two figures comparable. This converts units. It does not interpret results, does not compare your value against a reference interval, and is not a substitute for the clinician who ordered the test — reference intervals differ between laboratories, methods and populations.
How to use the Folate Unit Converter
- Type your folate result into the box.
- Pick the unit it is written in — ng/mL or nmol/L.
- Read the converted value, with the factor shown so you can check it.
About the Folate Unit Converter
Serum folate and red cell folate are reported in the same units and convert with the same factor, but they are not interchangeable measurements — red cell folate reflects months of intake and serum folate reflects days. Converting the units correctly does not make the two figures comparable. ng/mL in the US; nmol/L in the UK, Europe, Canada and Australia.
Details
| Conventional unit | ng/mL — ng/mL in the US; nmol/L in the UK, Europe, Canada and Australia. |
|---|---|
| Factor | 1 ng/mL = 2.26553 nmol/L (divide by 0.441398 to go back) |
| Where it comes from | Molar mass: folic acid has a molar mass of 441.4 g/mol |
| Worked examples | 4 ng/mL is 9.1 nmol/L; 10 ng/mL is 22.7 nmol/L; 20 ng/mL is 45.3 nmol/L |
| Privacy | The arithmetic runs in your browser. Nothing you type is sent anywhere or stored. |
The conversion is arithmetic and it is exact. What a converted number means is not arithmetic — reference intervals are set by each laboratory against its own method and population, which is why this page prints the factor and the worked examples but never a verdict.
Where this tool stops
This converts units. It does not interpret results, does not compare your value against a reference interval, and is not a substitute for the clinician who ordered the test — reference intervals differ between laboratories, methods and populations.
Frequently asked questions
Can I compare a serum folate result with a red cell folate result?
Not directly, even in the same units. Red cell folate values are several times higher because they measure stores accumulated over the life of the cell, while serum folate follows recent diet. The conversion factor is the same for both; the reference intervals are not.
Which unit does my country use?
Ng/mL in the US; nmol/L in the UK, Europe, Canada and Australia. If your report does not print the unit, ask the laboratory rather than guessing — for most analytes the two scales are far enough apart to tell them apart, but not for all of them.
Is the factor exact?
It is exact to the precision of the molar mass it comes from. Here folic acid has a molar mass of 441.4 g/mol, giving 1 ng/mL = 2.26553 nmol/L. Rounded factors printed on lab reports and in textbooks agree with this to within a few hundredths of a percent.
Does this tool tell me if my result is normal?
No, deliberately. It converts a number between two units and stops there. Reference intervals differ between laboratories, between methods and between populations, and a value only means something alongside the rest of your results and your history.
Do I need an account to use the Folate Unit Converter?
No charge and no sign-up. There is no free tier to run out of because there is no paid tier — inputtesthub.com is funded by advertising rather than by metering the utility.
Is what I paste into the Folate Unit Converter stored?
No. The Folate Unit Converter runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
Where does the Folate Unit Converter stop being reliable?
This converts units. It does not interpret results, does not compare your value against a reference interval, and is not a substitute for the clinician who ordered the test — reference intervals differ between laboratories, methods and populations. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What are the key numbers for the Folate Unit Converter?
Conventional unit is ng/mL — ng/mL in the US; nmol/L in the UK, Europe, Canada and Australia.. Factor is 1 ng/mL = 2.26553 nmol/L (divide by 0.441398 to go back). Where it comes from is Molar mass: folic acid has a molar mass of 441.4 g/mol. These are printed on the page itself, so you do not have to take them on trust.
Can I rely on this for exact work?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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