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Unit conversion

Testosterone unit converter

Convert a total testosterone result between ng/dL (the US convention) and nmol/L (the SI unit used almost everywhere else). Type into either field.

Enter a value in either field — the other updates automatically.

For education only. This tool only converts units — it does not interpret whether your result is in a typical range.

How this conversion works

Testosterone's molecular weight is 288.42 grams per mole. That single physical constant defines the exact relationship between mass-based units (ng/dL) and molar units (nmol/L): multiply ng/dL by 0.0347 to get nmol/L, or divide nmol/L by 0.0347 (equivalently, multiply by about 28.85) to get ng/dL.

When this matters

If you've had labs drawn in different countries, switched providers, or you're reading research published with SI units, you'll often need to convert before you can compare two results side by side. The conversion itself never changes what the measurement means.

Frequently asked questions

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

Multiply the ng/dL value by 0.0347. For example, 500 ng/dL times 0.0347 equals about 17.35 nmol/L. This tool does that conversion instantly in either direction.

Why do some labs report in ng/dL and others in nmol/L?

ng/dL is the conventional unit used in the United States, while nmol/L is the SI unit used in most other countries, including Canada, the UK, and across Europe. Both measure the same thing, just in different units.

Where does the 0.0347 conversion factor come from?

It comes from testosterone's molecular weight, 288.42 grams per mole. That fixed physical constant, not a lab-specific adjustment, is what links the two unit systems, so the conversion factor is exact and the same everywhere.

Does converting units change whether my result is normal?

No. Converting units never changes what the number means, only how it is expressed. Reference ranges are usually published in the same unit as your lab's report, so compare your result to a range given in that same unit.

This tool is for general educational purposes and is not medical advice. It does not interpret your result as normal, low, or high. Talk to a licensed healthcare provider about what your lab results mean for you.

Method

Standard molar-mass unit conversion (testosterone molecular weight 288.42 g/mol), the same factor used throughout clinical chemistry to convert conventional to SI units.