Testosterone Converter Tool

Convert Testosterone Units

Type a value into one of the fields below. The calculator will automatically translate it into the remaining formats and show where you sit on the reference range.

Enter Your Level

UK Standard (nmol/L)

nmol/L

US Standard (ng/dL)

ng/dL

Alternative (ng/mL)

ng/mL

Converted Results

nmol/L (UK): —
ng/dL (US): —
ng/mL: —
Category: —

Testosterone Range (nmol/L)

Low 0–15 nmol/L

Borderline 15.1–18 nmol/L

Normal > 18.1 nmol/L

Clinical Guidance

Enter a value and press Calculate to see your result analysis.

Formulas

Formula: How to convert nmol/L to ng/dL

If you want to manually perform a testosterone conversion from nmol/L to ng/dL, you divide your nmol/L value by 0.0347. For example, a UK lab result of 15 nmol/L divided by 0.0347 equals approximately 432 ng/dL. Using our calculator above guarantees a fast and accurate result without the math.

Formulas

Formula: How to convert ng/dL to nmol/L

To convert ng/dL to nmol/L, you multiply your ng/dL value by 0.0347. For instance, a US lab reading of 500 ng/dL multiplied by 0.0347 equals 17.35 nmol/L. Our testosterone unit converter handles this formula instantly.

Context

Why testosterone unit conversion matters

Testosterone levels are not universally reported in the same format. In the UK, most healthcare providers and private TRT clinics report total testosterone in nmol/L. Conversely, the vast majority of US medical literature and lab reports use ng/dL. A reliable testosterone unit converter helps eliminate confusion by standardizing your results, allowing you to accurately compare your blood work against international criteria.

Interpretation

Understanding your testosterone conversion results

Once you convert your testosterone units, the output must be interpreted within the correct reference range for that specific unit. Reference ranges can fluctuate slightly based on the laboratory, testing assay, your age, and clinical context. Therefore, a converted result should never be evaluated in isolation.

Generally speaking, total testosterone levels above 18 nmol/L (approx. 518 ng/dL) are considered normal. Results below this may be classified as borderline or low, depending on the clinic's specific guidelines and your broader health profile. Crucial factors such as free testosterone, SHBG (Sex Hormone-Binding Globulin), albumin, symptoms, and lifestyle habits all influence the clinical interpretation of your numbers.

Next Steps

Total testosterone vs. Free testosterone

While this tool handles total testosterone conversion, your total testosterone does not reveal how much of that hormone is actually biologically active and available for your body to use. If your total testosterone appears normal but you still experience symptoms of low T, looking at your free testosterone and SHBG levels is vital. A testosterone converter gives you baseline clarity, but it does not replace a comprehensive hormone assessment.

Questions and Answers

Testosterone Conversion FAQs

How do I convert nmol/L to ng/dL?

To convert testosterone from nmol/L to ng/dL, divide your nmol/L result by 0.0347. Alternatively, you can use our testosterone converter tool above to get an instant, accurate calculation.

How do I convert ng/dL to nmol/L?

To convert ng/dL to nmol/L, simply multiply your ng/dL value by 0.0347. Our unit conversion calculator handles this formula automatically if you input your number into the ng/dL field.

What is considered a normal testosterone level?

While reference ranges vary slightly by lab, a general normal range for healthy adult men is often cited as roughly 12 to 31.9 nmol/L, which converts to about 346 to 922 ng/dL. Levels below 12 nmol/L (or roughly 346 ng/dL) usually prompt further investigation for low testosterone.

Why does my doctor use nmol/L but online articles use ng/dL?

nmol/L is the standard international unit (SI unit) used by healthcare systems in the UK, Australia, and parts of Europe. ng/dL is the conventional unit heavily used in the United States. Much of the online fitness and medical discussion originates in the US, making a converter essential for non-US readers.

Is this testosterone converter suitable for UK users?

Yes. This testosterone converter is highly relevant for UK users because UK laboratories predominantly report testosterone in nmol/L. It allows patients to read international TRT research (which usually uses ng/dL) and understand how their UK results compare.

Does converting testosterone units change my actual result?

No. A testosterone unit conversion does not change your actual hormone level. It simply expresses the exact same biological value in a different mathematical unit, much like converting miles to kilometers.

Can I use this tool to convert free testosterone?

No. This tool is designed strictly for total testosterone conversion using standard molecular weights. Free testosterone is measured differently (often in pmol/L or pg/mL) and requires different conversion factors depending on the specific testing assay used by the laboratory.

How accurate is this testosterone conversion calculator?

This calculator uses the standard, medically accepted conversion factor of 0.0347 (or multiplying by 28.84 depending on the direction). It provides a mathematically exact conversion of your total testosterone result, though your clinical diagnosis should always be discussed with a doctor.

Medical Disclaimer

This testosterone unit conversion tool is provided for informational and educational use only. It is not intended to diagnose, treat, cure, or prevent any medical condition, and it does not replace advice from a qualified healthcare professional. Any decision about testing, diagnosis, or treatment should be made with appropriate clinical guidance.