Testosterone Level Interpreter Calculator
T-level interpretation by age with symptom correlation.
About this calculator
This calculator does two separate things with your inputs, and they barely talk to each other. First, it places your total testosterone against an age-specific normal range (six brackets from 270-1070 ng/dL at ages under 30 down to 100-600 ng/dL at 70+) to produce a Classification and an Age percentile. Second, it builds a Clinical concern index (0-100) from a testosterone-deficiency term plus a symptom-burden term -- and the deficiency term is zero unless your total testosterone actually falls below the lower bound of your age bracket.
At typical lab values (a total T comfortably above that floor), Clinical concern index moves almost entirely with how you rate the four symptoms -- fatigue, low libido, mood, and muscle/strength loss -- each contributing equally on a 1-5 scale, not with the lab numbers themselves. Free testosterone and SHBG are reported and interpreted on their own (a normal/ abnormal flag and a low/normal/high band) but never feed into Clinical concern index at all. This is a screening aid, not a diagnosis: it doesn't know your assay's reference lab, doesn't account for time-of-day variation (testosterone is highest in the morning), and a low score here doesn't rule out hypogonadism any more than a high score confirms it.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
Clinical concern index (0-100)
0
How to Use This Calculator
- Enter age and total testosterone (ng/dL), free testosterone (pg/mL), and SHBG (nmol/L) from your blood work.
- Rate each symptom severity from 1 (none) to 5 (severe): fatigue, low libido, mood issues, and muscle/strength loss.
- Review Clinical concern index (0–100) combining lab values and symptom burden.
- Check Classification (0–5) and Age percentile (%) to see where your levels fall in the normal range for your age.
- Use Expected T for age and Normal range to contextualize your results before discussing treatment with a physician.
How the result changes with Fatigue severity (1-5)
| Fatigue severity (1-5) | Clinical concern index (0-100) |
|---|---|
| 1 | 0 |
| 1.5 | 1.6 |
| 2.5 | 4.7 |
What each input means
- Age
- Your current age in years.
- Total testosterone (ng/dL)
- Total testosterone from blood work in ng/dL.
- Free testosterone (pg/mL)
- Free (unbound) testosterone in pg/mL.
- SHBG (nmol/L)
- Sex Hormone-Binding Globulin level. Normal male range: 10-57 nmol/L.
- Fatigue severity (1-5)
- 1 = none, 5 = severe fatigue.
- Low libido severity (1-5)
- 1 = normal, 5 = severely reduced libido.
- Mood symptoms (1-5)
- 1 = none, 5 = severe depression/irritability.
- Muscle/strength loss (1-5)
- 1 = none, 5 = significant muscle wasting.
What each result means
- Clinical concern index (0-100)
- Combined score of testosterone deficiency and symptom burden.
- Age percentile (%)
- Where your total T falls within the normal range for your age.
- Classification (0-5)
- 0=severely low, 1=low, 2=low-normal, 3=normal, 4=high-normal, 5=high.
- Age-normal lower limit (ng/dL)
- Lower bound of normal total T for your age.
- Age-normal upper limit (ng/dL)
- Upper bound of normal total T for your age.
- Expected T for age (ng/dL)
- Midpoint of normal range for your age group.
- Free T normal? (1=Yes)
- 1 if free testosterone is above the age-specific lower limit.
- Estimated bioavailable T
- Simplified estimate of bioavailable testosterone.
- SHBG status (0/1/2)
- 0=low, 1=normal, 2=high SHBG.
- Symptom burden (0-100)
- Normalized symptom severity score.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersAge = 45, Total testosterone (ng/dL) = 450, Free testosterone (pg/mL) = 12, SHBG (nmol/L) = 40 = 8 input(s) provided
- Calculate Clinical concern indexClinical concern index0 = 0
- Calculate Age percentileAge percentile35.7 = 35.7
- Calculate Classification3 = 3
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why doesn't my testosterone level move the Clinical concern index?
The index only adds a deficiency penalty when your Total testosterone falls below the lower bound of your age-specific normal range (e.g. 200 ng/dL for a man in his 40s). Above that floor, the deficiency term is mathematically zero, so the index responds only to how you rate fatigue, low libido, mood, and muscle loss -- not to how far above normal your lab value sits.
Do Free testosterone and SHBG affect my Clinical concern index?
No -- Free testosterone (pg/mL) and SHBG (nmol/L) are interpreted separately as their own status flags (Free T normal? and SHBG status), but neither term appears in the Clinical concern index formula. Only Total testosterone (through the deficiency check) and the four symptom ratings feed that score.
Why does rating a symptom as more severe raise my concern index?
Fatigue, low libido, mood symptoms, and muscle/strength loss are summed into a symptom-burden score with equal weight, then scaled into the Clinical concern index at half strength. Raising any one of the four severity ratings raises that sum directly, so the index climbs whenever a symptom is rated more severe -- independent of your lab values.
How is Age percentile different from Classification?
Age percentile is a continuous 0-100 measure of where your Total testosterone sits between the lower and upper bound of your age bracket. Classification buckets that same comparison into six discrete bands (0=severely low through 5=high) using fixed fractions of the bracket width, so two people with different percentiles can land in the same classification band.
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