Testosterone-to-estradiol ratio with automatic unit conversion. For education only — not medical advice. Discuss your results with your clinician.
Ratio convention: total testosterone (ng/dL) ÷ estradiol (pg/mL). Any supported unit pair gives the same number.
Testosterone: —
Estradiol: —
Targets are illustrative. Do not adjust medication or supplements to chase a number — discuss any target with your clinician.
There is no universal consensus on a healthy T/E2 range. The bands below are what secondary sources and small studies report — the calculator shows which band your result falls in, with the source context:
| Ratio | Reported context |
|---|---|
| < 10 | Below the lower-limit threshold reported in published infertility studies (J Reprod Infertil 2024; EVA project) |
| 10 – 14 | Inside the broad clinical range (10–30), below the 14–20 fertility-discussion window |
| 14 – 20 | Window most often quoted for fertility contexts, attributed to small studies |
| 20 – 25 | Inside the 15–25 range used by some TRT-focused practitioners |
| 25 – 30 | Top of the broad 10–30 clinical range cited in secondary sources |
| > 30 | Above the broad clinical range cited in secondary sources |
Omni Calculator takes the position that there are no fixed ratio values — what matters is each hormone sitting inside its own reference range (commonly cited general ranges: testosterone 300–1000 ng/dL; estradiol 14–55 pg/mL; ranges are lab-specific).
Educational answers only — not medical advice. Discuss your situation with your clinician.
Divide your total testosterone (in ng/dL) by your estradiol (in pg/mL): T/E2 = T ÷ E2. For example, testosterone 600 ng/dL divided by estradiol 30 pg/mL gives a ratio of 20.0. If your lab reports different units, convert first: testosterone × 0.03467 gives nmol/L; estradiol × 3.6713 gives pmol/L.
No. Different sources cite different windows: 10–30 is used by many clinicians; 14–20 is often quoted in fertility discussions and comes from small studies; 15–25 appears in TRT-focused guidance. Omni Calculator takes the position that what matters is each hormone sitting inside its own reference range. Treat any quoted range as a reported convention, never as a diagnosis.
A low ratio — below about 10 in the published study cutoffs — usually means estradiol is high relative to testosterone. The literature links this pattern to higher aromatase activity (for example in adipose tissue), low total testosterone, or both. It is a rough marker of hormone balance, not a diagnosis; discuss it with your clinician.
Aromatase is the enzyme that converts testosterone into estradiol. It does not work in reverse — estradiol cannot be converted back into testosterone. A small fraction of testosterone is normally aromatized; more aromatase activity lowers the T/E2 ratio by raising estradiol relative to testosterone.
No. The aromatase pathway runs one way in the body: testosterone → estradiol. There is no physiological route that turns estradiol back into testosterone.
Whenever the ratio or either hormone falls outside reference ranges, if you notice symptoms such as low libido, erectile difficulties, breast tissue tenderness or enlargement, mood changes, or fertility concerns — or before changing any medication or supplement. This calculator is educational only and cannot diagnose any condition.
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