Hormonology
FT4
Free Thyroxine
Free T4 Unit Converter
Convert Free T4 between pmol/L, ng/dL, and pg/mL.
Published on: 2026-06-06 ·
Last updated: 2026-06-06
Enter Free T4 value
You can enter a value in any supported unit.
Please enter a valid positive number.
What does this converter do?
This tool converts Free T4 values between pmol/L, ng/dL, and pg/mL. The conversion is specific to Free T4 and should not be used for Free T3, TSH, insulin, or any other laboratory analyte.
Supported units
pmol/L · SI unit
ng/dL · US conventional
pg/mL · alternative
Conversion formulas
ng/dL = pmol/L × 0.0777
pmol/L = ng/dL × 12.87
pg/mL = ng/dL × 10
pg/mL = pmol/L × 0.777
Example conversion
If Free T4 = 14 pmol/L, then Free T4 ≈ 1.09 ng/dL and ≈ 10.88 pg/mL.
Important laboratory note
Free T4 reference ranges vary by laboratory method, assay platform, age, pregnancy status, and local reporting standards. This converter only changes units and does not diagnose thyroid disease.