Testosterone Level Interpreter Calculator

T-level interpretation by age with symptom correlation.

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

Age

Total testosterone (ng/dL)

Free testosterone (pg/mL)

SHBG (nmol/L)

Fatigue severity (1-5)

Low libido severity (1-5)

Mood symptoms (1-5)

Muscle/strength loss (1-5)

Tab to move between fields

Results

Clinical concern index (0-100)

Age percentile (%)35.7

Classification (0-5)3

Age-normal lower limit (ng/dL)200

Age-normal upper limit (ng/dL)900

Expected T for age (ng/dL)550

Free T normal? (1=Yes)1

Estimated bioavailable T10.2

SHBG status (0/1/2)1

Symptom burden (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)
1.4	1.3
2.4	4.4
3.6	8.1
4.6	11.3

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 Parameters
4 parameters
Age = 45, Total testosterone (ng/dL) = 450, Free testosterone (pg/mL) = 12, SHBG (nmol/L) = 40 = 8 input(s) provided
Calculate Clinical concern index
Clinical concern index
0 = 0
Calculate Age percentile
Age percentile
35.7 = 35.7
Calculate Classification
3 = 3