Testosterone Level Chart: Where Do You Stand?

Your testosterone result is only meaningful in context. A number like 450 ng/dL could be excellent for a 60-year-old or concerning for a 35-year-old with symptoms. Knowing where you stand relative to age-matched norms and optimal function targets gives your result real meaning.

Testosterone Level Zones	Zone
Total T (ng/dL)	What It Means
Critically Low	Below 200
Severe hypogonadism; significant health risks; medical treatment warranted	Low
200–350	Clinically deficient; treatment strongly recommended with symptoms
Low-Normal	350–450
Below optimal for most men; evaluate symptoms and free T	Optimal
500–800	Associated with best outcomes for energy, muscle, mood, and libido
High-Normal	800–1000
Upper range; generally fine; monitor for estradiol balance	Elevated
Above 1000	Often from exogenous T; may require dose adjustment
Optimal Ranges by Decade	Age
Good	Optimal
Concerning	30s
500–750 ng/dL	600–850 ng/dL
Below 450 ng/dL	40s
450–700 ng/dL	550–750 ng/dL
Below 400 ng/dL	50s
400–650 ng/dL	500–700 ng/dL
Below 350 ng/dL	60s
350–600 ng/dL	450–650 ng/dL
Below 300 ng/dL	The Problem With Lab Reference Ranges

What testosterone level is considered low?

Most guidelines define low testosterone as total T below 300 ng/dL. However, symptoms and functional impairment matter as much as the number. Men between 300–450 ng/dL may be symptomatic—especially if free testosterone is also low. Diagnosis requires both laboratory confirmation and clinical symptoms.

Most commercial labs flag testosterone as "low" only below 300 ng/dL. This threshold is based on statistical population distributions — what is common in the tested population — not what is optimal for health and performance. A man with 320 ng/dL will receive a "normal" report from most labs, even though he may be significantly symptomatic and at elevated risk for bone density loss, metabolic dysfunction, and cardiovascular complications.

What testosterone level is optimal for performance?

Most men feel best with total testosterone between 600–900 ng/dL and free testosterone above 12–15 pg/mL. This range is associated with optimal energy, libido, body composition, and cognitive function. Individual thresholds vary—some men are symptomatic at 500 ng/dL, others are fine. Personal symptom-level correlation matters.

The trend is also important. If your T was 650 ng/dL three years ago and is now 420 ng/dL, that trajectory is clinically significant even if the current number falls within the broad reference range.

Evaluating Free Testosterone and SHBG Together

Total testosterone alone does not determine function. Always assess free T and SHBG alongside it. A man with Total T of 500 ng/dL and SHBG of 65 nmol/L may have free T of just 7 pg/mL — significantly below the optimal range for his age. This man is functionally testosterone-deficient despite appearing "normal" on a basic panel.

Can testosterone be too high?

Yes. Supraphysiologic testosterone (typically above 1,200 ng/dL) increases erythrocytosis (elevated hematocrit) risk, can worsen sleep apnea, and does not proportionally improve benefits while increasing side effect risk. The goal of therapeutic testosterone is to achieve optimal physiologic range, not maximum levels.

What to Do With Your Number

Does testosterone vary significantly throughout the day?

Yes—by 25–35%. Testosterone peaks between 7–10 a.m. and is at its lowest in the late afternoon. Testing must always be done in the morning for accurate assessment. Evening tests consistently return lower values and can incorrectly suggest deficiency in men who are actually within range.

If your level falls in the low or low-normal zone with corresponding symptoms, the next step is a full panel (LH, FSH, free T, SHBG, estradiol) and a conversation with a provider who takes men's hormonal health seriously. Numbers in the optimal zone with no symptoms require no action beyond maintaining good lifestyle habits and monitoring annually.