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Hormones

Thyroid, sex hormones, pituitary, adrenal, pregnancy, fertility, and hormone ratio calculators.

About Hormones Conversions

Hormone results are among the most commonly converted lab values, partly because they are reported in so many different units — ng/dL for testosterone, pg/mL for estradiol, µg/dL for cortisol, pmol/L for free thyroid hormones. This category brings together converters for the thyroid axis (TSH, Free T3, Free T4, Total T3 and T4), the sex hormones (testosterone, estradiol, progesterone), the adrenal hormone cortisol, and 25-OH vitamin D, along with the generic molar-to-mass converters they rely on.

Hormones also carry more interpretive nuance than most lab tests, and the dedicated pages reflect that: testosterone is read differently in men and women and against SHBG, estradiol swings across the menstrual cycle, cortisol depends heavily on the time of the blood draw, and progesterone confirms ovulation only on the right cycle day. So a converted number is only the starting point — each page pairs the conversion with the reference ranges and context needed to make sense of it.

Available Calculators

Browse all hormones tools available on ConvertMedUnits.com.

Hormone Unit Conversion Calculator Convert common hormone units for testosterone, estradiol, progesterone, cortisol, Free T3, Free T4, vitamin D, and aldosterone. Vitamin D ng/mL to nmol/L Calculator Convert 25-OH vitamin D between ng/mL and nmol/L with the 2.496 factor and deficiency/sufficiency ranges. Testosterone Conversion Calculator Convert total testosterone between ng/dL and nmol/L with the 0.03467 factor, plus male and female reference ranges. Estradiol Conversion Calculator Convert estradiol (E2) between pg/mL and pmol/L with the 3.671 factor, plus cycle-phase, menopause and male reference ranges. Cortisol Conversion Calculator Convert cortisol between µg/dL and nmol/L with the 27.59 factor, plus morning/afternoon ranges and adrenal insufficiency and Cushing cut-offs. Progesterone Conversion Calculator Convert progesterone between ng/mL and nmol/L with the 3.18 factor, plus cycle-phase, day-21 ovulation-confirmation and pregnancy ranges. Free Testosterone Calculator Estimate calculated free testosterone from total testosterone, SHBG, and albumin. TSH Unit Conversion Calculator Convert TSH values between mIU/L and µIU/mL with the direct 1:1 unit relationship. Free T3 Unit Conversion Calculator Convert Free T3 between pmol/L and pg/mL using the molecular weight of triiodothyronine. Free T4 Unit Conversion Calculator Convert Free T4 between pmol/L and ng/dL for thyroid lab reports. Total T3 Unit Conversion Calculator Convert Total T3 thyroid lab results between ng/dL and nmol/L with formula and chart. Total T4 Unit Conversion Calculator Convert Total T4 thyroid lab results between µg/dL and nmol/L with formula and chart. nmol/L to ng/mL Conversion Calculator Convert hormones, vitamins, and other analyte values using molecular weight. ng/mL to nmol/L Conversion Calculator Convert hormone and vitamin values from ng/mL to nmol/L using molecular weight. ng/dL to nmol/L Conversion Calculator Convert testosterone and steroid hormone lab values between ng/dL and nmol/L. pmol/L to pg/mL Conversion Calculator Convert hormone values from picomoles per liter to picograms per milliliter.

Frequently Asked Questions

Common questions about hormones lab unit conversions.

Why are hormones reported in so many different units?

Each hormone has a different molecular weight and is present at very different concentrations, so labs pick units that suit the scale — ng/dL, pg/mL, µg/dL or pmol/L. Converting to the unit your reference range uses is what makes the value interpretable.

Does the timing of a hormone test matter?

Often, yes. Cortisol follows a daily rhythm and is usually drawn in the morning, testosterone peaks in the morning, and estradiol and progesterone vary across the menstrual cycle. The draw time or cycle day is part of interpreting the result.

What is the difference between total and free hormone levels?

Total measures hormone bound to carrier proteins plus the small free fraction; free (or bioavailable) is the active part. When binding proteins are abnormal, the free level gives a clearer picture — as with free testosterone or free thyroid hormones.