Omni calculator
Last updated:

Testosterone to Estradiol Ratio Calculator

Table of contents

How is testosterone to estradiol ratio calculated?What unit is testosterone measured in?What is testosterone to estradiol ratio?FAQs

The calculation of testosterone to estradiol ratio, also known as T/E2, is a parameter linked to a whole spectrum of male health aspects, primarily associated with sexual functions. The values needed for the estimation are free testosterone (T) and estradiol (E2) concentrations. You can also use the calculator to convert estradiol and testosterone measurement units.

We try our best to make our Omni Calculators as precise and reliable as possible. However, this tool can never replace a professional doctor's assessment. If any health condition bothers you, consult a physician.

How is testosterone to estradiol ratio calculated?

The formula itself is straightforward:

ratio = testosterone / estradiol

The tricky part is that before calculating the testosterone to estradiol ratio, both hormone concentrations need to be expressed in the same units. They're generally presented in different ways: testosterone in ng/dL and estradiol in pg/mL.

There's no fixed range for the ratio value. It's important that testosterone (10-35 nmol/L or 300-1000 ng/dL) and estradiol levels (50-200 pmol/L or 14-55 pg/mL) are within normal ranges.

There is an engaging article by Drs. Moskovic, Eisenberg, and Lipschultz on the topic of T/E2 ratio fluctuations (see the first source at the top of this page).

What unit is testosterone measured in?

The most frequently used testosterone unit of measurement is ng/dL (nanogram per deciliter), and the international standard is nmol/L (nanomole per liter).

The conversion of its concentration is calculated by using these formulae:

1 nmol/L = 1000 pmol/L = 28.85 ng/dL


1 ng/dL = 0.03466 nmol/L = 34.66 pmol/L

You could expect the conversion of estradiol units to be conducted in the same way. However, the concentration of every substance is calculated differently. For estradiol, you do it this way:

1 pmol/L = 0.2724 pg/mL


1 pg/mL = 3.6713 pmol/L

Check out the following other calculators to see how progesterone, cholesterol, and glucose units are converted:

What is testosterone to estradiol ratio?

According to scientific research, the T/E2 ratio is a parameter linked to various aspects of male health:

  • Male coronary heart disease development.

  • Development of ameliorate depressive symptoms.

  • Atherosclerosis development.

  • Infertility treatment prognosis.

  • Prediction of low libido and erectile dysfunctions.

Check out other ratio calculators, such as cholesterol ratio calculator.


What is a good testosterone to estradiol ratio?

There are no fixed values for the T/E2 ratio to be considered healthy. It's considered good as long as the individual hormone levels are within normal ranges:

  • Testosterone (T): 300-1000 ng/dL (10-35 nmol/L); and
  • Estradiol (E2): 14-55 pg/mL (50-200 pmol/L).

How do I calculate the testosterone to estradiol ratio?

To calculate the T/E2 ratio:

  1. Determine the concentrations of testosterone (T) and estradiol (E2).
  2. Make sure that they're expressed in the same units.
    • Remember that the conversion of concentration for each substance is different!
  3. Divide the value for testosterone by the one measured for estradiol - this is the testosterone to estradiol ratio.

What is the T/E2 ratio for 60 ng/dL of testosterone and 29 pg/mL of estradiol?

The testosterone to estradiol ratio is 19.53.
To see that this is the case, we convert both concentrations so they have consistent units:
testosterone/estradiol = (60 × 34.66 pmol/L) / (29 × 3.6713 pmol/L) = 2079.7 / 106.47 = 19.53.

Can estradiol be converted into testosterone?

No. Testosterone can be converted into estradiol through the aromatase enzyme if it doesn't bind to any androgen receptor - typically, this happens to a small fraction of it. However, this does not work the other way around.

Check out 34 similar gynecology & pregnancy calculators 🤰
BBTBirth controlBishop score...31 more