Total T4: µg/dL to nmol/L
Convert Total T4 between µg/dL and nmol/L — Total T4 is reported in µg/dL in the US and nmol/L elsewhere. Type in either box to convert both ways.
Total T4 conversion table (µg/dL to nmol/L)
| Total T4 (µg/dL) | Total T4 (nmol/L) |
|---|---|
| 4 µg/dL | 51.4888 nmol/L |
| 5 µg/dL | 64.361 nmol/L |
| 6 µg/dL | 77.2332 nmol/L |
| 8 µg/dL | 102.978 nmol/L |
| 10 µg/dL | 128.722 nmol/L |
| 12 µg/dL | 154.466 nmol/L |
How to convert Total T4 from µg/dL to nmol/L
To convert Total T4, multiply µg/dL by 12.87 — thyroxine (T4) has a molar mass of 776.87 g/mol. For example, 1 µg/dL equals 12.8722 nmol/L. The converter above runs the exact factor at full precision and updates as you type; the swap button flips the direction.
Frequently asked questions
How do you convert Total T4 from µg/dL to nmol/L?
Multiply µg/dL by 12.87 — thyroxine (T4) has a molar mass of 776.87 g/mol. For example, 1 µg/dL is 12.8722 nmol/L. The converter above does this instantly and works both ways — type a value in either box. It uses the exact factor at full precision, so the result matches published clinical conversions.
What is a normal Total T4 level?
Total thyroxine (T4) is typically about 5–12 µg/dL (64–154 nmol/L) in adults. These are general adult figures only — the reference interval on your own lab report is what applies to you, and it can differ by lab, method, age and sex. The conversion table above runs from 4 to 12 µg/dL, or 51.4888 to 154.466 nmol/L, so a range quoted in either system can be lined up against your own figure.
Why is Total T4 reported in different units?
Total T4 is reported in µg/dL in the US and nmol/L elsewhere. The two systems describe the same measurement, so a value converts exactly from one to the other with no loss of meaning — only the units and the number change. That is why guidelines, journals and lab reports from different countries quote different numbers for the same Total T4 result. The two boxes above are labelled µg/dL and nmol/L, so you can read a value in whichever system your own report uses.
Is this Total T4 converter accurate and free?
Yes — this Total T4 converter is both accurate and free. It applies the standard, published conversion factor at full double precision in your browser, with nothing uploaded or stored, and there is no sign-up or usage limit. It converts units only and does not interpret or diagnose results.
This is a unit-conversion reference tool, not a diagnosis or medical advice. Reference intervals are general adult guides that vary by laboratory, method and individual — always read your result against the range printed on your own report and discuss it with a qualified healthcare professional.
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