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    High prolactin

    Hi all, In the last few months, I started to experience issues getting strong wood, having a late ejaculation (or even not), and way less semen. I did my blood test and voilà: (I'm not on TRT) total T: 727ng/dL shbg: 69nmol/L (lab normal range: from 18 to 54) cbg: 55 mg/L (lab normal range...
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    Phone app to compute free T (Vermeulen, Mazer, Södergård) and immunoassay calibration

    Dear Excelmale members, Recently, I've been working with the help of a friend (actually he did most of the work) on an Android software that helps in the computation of free T (contains Vermeulen, Mazer, Södergård, ...) and that generates reports that link the values obtained to the current...
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    Testosterone in athletes

    Several articles are showing that many athletes have an FT that is debatably low. Such in this one: http://dx.doi.org/10.1136/bjsports-2017-097792 https://pubmed.ncbi.nlm.nih.gov/29445518/ As an amateur marathoner (just about the 3hour for full-marathon), it seems that my endogenous FT...
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    SHBG cause or consequence of hypogonadism?

    Dear all, I'm pretty amazed by this website and the quality of all the discussions in that forum. I recently did some tests because I had the feeling that something was wrong with my T level, and also because I had a shock down there while doing sport a few months ago. My result is 720 ng/dL...
TRT Hormone Predictor Widget

TRT Hormone Predictor

Predict estradiol, DHT, and free testosterone levels based on total testosterone

⚠️ Medical Disclaimer

This tool provides predictions based on statistical models and should NOT replace professional medical advice. Always consult with your healthcare provider before making any changes to your TRT protocol.

ℹ️ Input Parameters

Normal range: 300-1000 ng/dL

Predicted Hormone Levels

Enter your total testosterone value to see predictions

Results will appear here after calculation

Understanding Your Hormones

Estradiol (E2)

A form of estrogen produced from testosterone. Important for bone health, mood, and libido. Too high can cause side effects; too low can affect well-being.

DHT

Dihydrotestosterone is a potent androgen derived from testosterone. Affects hair growth, prostate health, and masculinization effects.

Free Testosterone

The biologically active form of testosterone not bound to proteins. Directly available for cellular uptake and biological effects.

Scientific Reference

Lakshman KM, Kaplan B, Travison TG, Basaria S, Knapp PE, Singh AB, LaValley MP, Mazer NA, Bhasin S. The effects of injected testosterone dose and age on the conversion of testosterone to estradiol and dihydrotestosterone in young and older men. J Clin Endocrinol Metab. 2010 Aug;95(8):3955-64.

DOI: 10.1210/jc.2010-0102 | PMID: 20534765 | PMCID: PMC2913038

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