How to Convert Testosterone ng/dL to nmol/L
Total testosterone is reported in ng/dL in the US and in nmol/L across the UK, Europe, Canada and Australia. The conversion factor is 0.03467, from testosterone's molecular weight of 288.42 g/mol.
Testosterone nmol/L = testosterone ng/dL × 0.03467 Testosterone ng/dL = testosterone nmol/L × 28.84 Some reports use ng/mL; there, 1 ng/mL = 100 ng/dL (so 3 ng/mL = 300 ng/dL).
Testosterone ng/dL to nmol/L Chart
| ng/dL | nmol/L | Context (adult men) |
|---|---|---|
| 264 ng/dL | 9.2 nmol/L | Lower limit (adult men) |
| 300 ng/dL | 10.4 nmol/L | Commonly cited low-normal |
| 500 ng/dL | 17.3 nmol/L | Mid-normal (men) |
| 700 ng/dL | 24.3 nmol/L | Upper-normal (men) |
| 916 ng/dL | 31.8 nmol/L | Upper limit (adult men) |
| 1000 ng/dL | 34.7 nmol/L | High |
nmol/L to ng/dL Reverse Chart
| nmol/L | ng/dL |
|---|---|
| 10 nmol/L | 288 ng/dL |
| 15 nmol/L | 433 ng/dL |
| 20 nmol/L | 577 ng/dL |
| 30 nmol/L | 865 ng/dL |
Testosterone Reference Ranges
| Group | ng/dL | nmol/L |
|---|---|---|
| Adult men | 264–916 ng/dL | 9.2–31.8 nmol/L |
| Adult women | 15–70 ng/dL | 0.5–2.4 nmol/L |
The men's range shown is the harmonised range for healthy, non-obese young men; many labs still report 300–1000 ng/dL (10.4–34.7 nmol/L). Ranges fall with age and vary by assay, so always compare with your own lab's range.
Total vs Free Testosterone
This calculator converts total testosterone. Most testosterone is bound to SHBG and albumin; only the small free (bioavailable) fraction is active. When SHBG is high or low — with age, obesity, thyroid or liver conditions — total testosterone can be misleading, and free testosterone gives a clearer picture. Estimate it with the free testosterone calculator.
Worked Example
Suppose a UK report shows 15 nmol/L and you want ng/dL:
15 × 28.84 = 433 ng/dL 433 ng/dL sits comfortably in the normal male range. Converting the other way, a US result of 264 ng/dL is about 9.2 nmol/L, near the lower limit.
Frequently Asked Questions
How do you convert testosterone ng/dL to nmol/L?
Multiply ng/dL by 0.03467. For example, 300 ng/dL is about 10.4 nmol/L.
What is a normal testosterone level?
Adult men roughly 264–916 ng/dL (9.2–31.8 nmol/L); adult women 15–70 ng/dL (0.5–2.4 nmol/L).
Is my result in ng/dL or ng/mL?
Usually ng/dL. If ng/mL, multiply by 100 to get ng/dL.
Should testosterone be measured in the morning?
Yes — it peaks in the morning, and low results are confirmed on a repeat morning sample.
References
- UnitsLab — Testosterone unit conversion (ng/dL ↔ nmol/L).
- Testosterone factor 0.03467 (MW 288.42 g/mol); harmonised adult male reference range 264–916 ng/dL (CDC Hormone Standardization / Endocrine Society).
Conclusion
Converting total testosterone between ng/dL and nmol/L is a ×0.03467 (or ×28.84 the other way). Match your result to your lab's reference range, and if SHBG is abnormal, check free testosterone for a clearer picture.