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Normal testosterone levels by age in men

Check if your testosterone (ng/dL) is normal for your age. Reference table by age group (<30, 30–39, 40–49, 50–59, 60+) from Endocrine Society, AUA, and NHANES. Instant result.

🗓️ Updated June 2026 Reviewed by Martín Rodríguez

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Reviewed by: Martín Rodríguez (editorial policy ) · Last reviewed: Jun 22, 2026

Total testosterone result (ng/dL)*

Age (years)*

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Total testosterone in men follows a predictable arc: it peaks in the late teens and early 20s, then declines roughly 1–2% per year after age 30. But a single number means nothing without an age-matched reference range — a 400 ng/dL result is solidly normal at 65 and borderline low at 35. Enter your lab result and age to see exactly where you stand.

When to use this calculator

A 38-year-old man gets his annual bloodwork back showing 490 ng/dL and wants to know if that's normal for his age before his follow-up appointment.
A 55-year-old experiencing fatigue and reduced libido checks whether his 380 ng/dL result warrants a referral to an endocrinologist.
A 26-year-old athlete verifies that his 820 ng/dL result is within normal range and not flagged as abnormally high.
A 65-year-old evaluating whether his 310 ng/dL result, combined with symptoms, meets the threshold for a hypogonadism workup.

Normal testosterone levels by age in men (total testosterone)

Age group	Normal range (ng/dL)	Very low threshold (< 70% of lower limit)
Under 30	600–900	< 420
30–39	500–800	< 350
40–49	450–750	< 315
50–59	400–700	< 280
60 and older	300–600	< 210

Fuente: NHANES population data, Endocrine Society Clinical Practice Guideline (2017), and American Urological Association (AUA) Testosterone Deficiency Guideline.

How it works

Testosterone normal ranges by age — reference table

Quick-reference table for interpreting any lab result:

Age group	Normal range (ng/dL)	Very low threshold (<70% of lower limit)
Under 30	600–900	< 420
30–39	500–800	< 350
40–49	450–750	< 315
50–59	400–700	< 280
60 and older	300–600	< 210

Source: NHANES population data, Endocrine Society (2017) clinical practice guidelines, and American Urological Association (AUA).

> Important: These ranges reflect total testosterone measured in the morning (7–10 AM), which is the standard clinical protocol. A result drawn in the afternoon can read 20–35% lower in the same individual — not because levels changed pathologically, but because testosterone follows a circadian rhythm with its daily peak in early morning.

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How the calculator works

Enter your age and your lab result in ng/dL. The calculator assigns the corresponding age-bracketed reference range and classifies your result into one of four zones.

Classification logic

Zone	Criterion
Very low	< 70% of the lower limit for your age
Low	≥ 70% of lower limit, but below lower limit
Normal	Within the lower–upper limit range
High	Above the upper limit

The 70% threshold for "very low" reflects clinical practice: most endocrinologists treat total testosterone below 300 ng/dL (AUA) or 264 ng/dL (Endocrine Society) as the diagnostic threshold for hypogonadism, which corresponds to roughly 70% of the lower reference limit for younger age groups.

Unit note: If your lab report shows nmol/L (common in Canada, UK, and Australia), multiply by 28.84 to convert to ng/dL. Example: 10 nmol/L × 28.84 = 288 ng/dL.

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Why levels decline with age — and how fast

Testosterone decreases at approximately 1–2% per year after age 30, according to the Baltimore Longitudinal Study of Aging. This is a gradual process, not a sudden drop. By age 70, average total testosterone is roughly 35–40% lower than at age 25. This physiological decline is distinct from clinical hypogonadism, which involves a dysfunction of the hypothalamic-pituitary-gonadal (HPG) axis.

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What the result means

Normal: Your level is within the expected range for your age. No immediate action needed. Lifestyle factors — sleep quality, body fat percentage, resistance training, and alcohol intake — all influence where within the normal range you fall.

Low: Below the age-matched lower limit. This alone is not diagnostic. Symptoms, the time of day the blood was drawn, and a repeat test on a separate morning are all required before any clinical conclusion. The Endocrine Society explicitly recommends confirming a low result with a second measurement before diagnosis.

Very low: Below 70% of the lower limit. This range overlaps with the clinical thresholds used to diagnose hypogonadism (AUA: < 300 ng/dL; Endocrine Society: < 264 ng/dL). Consultation with an endocrinologist or urologist is appropriate.

High: Above the upper limit. In the absence of exogenous androgen use (testosterone therapy, anabolic steroids), this is uncommon and warrants evaluation.

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Common errors when interpreting a testosterone test

1. Ignoring draw time. An afternoon result below the lower limit may be normal if redrawn in the morning. Always note the collection time on your report.
2. Using a single test to self-diagnose. Day-to-day biological variability in testosterone can be 10–20%. One low result is insufficient for any clinical conclusion.
3. Overlooking SHBG. Total testosterone includes testosterone bound to sex hormone-binding globulin (SHBG), which is biologically inactive. Men with high SHBG (common with aging, liver disease, or hyperthyroidism) may have normal total testosterone but low free testosterone — the fraction that actually acts on tissues. This calculator does not calculate free testosterone.
4. Comparing to a general adult range. Many labs still print a single adult reference range (e.g., 280–1100 ng/dL) on their reports, ignoring age. An age-adjusted interpretation is more clinically meaningful.

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What this calculator does NOT include

Free or bioavailable testosterone — requires SHBG and albumin values.

Symptom assessment — low testosterone is only clinically relevant when paired with symptoms (reduced libido, fatigue, loss of muscle mass, erectile dysfunction, depressed mood).

LH and FSH levels — necessary to distinguish primary hypogonadism (testicular failure) from secondary hypogonadism (pituitary or hypothalamic origin).

Diagnosis or treatment recommendations — this tool is for informational reference only.

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Always interpret lab results in the context of your full clinical picture with a licensed healthcare provider.

Example: 44-year-old man, result 410 ng/dL

Age 44 → reference range for 40–49 age bracket: 450–750 ng/dL

Very low threshold = 70% × 450 = 315 ng/dL

410 ng/dL is below 450 (lower limit) but above 315 (very low threshold)

Classification: Low → recommend repeating the test in the morning (testosterone peaks between 7–10 AM) and discussing symptoms with your doctor

410 ng/dL = Low for a 44-year-old (normal range 450–750 ng/dL)

Disclaimer: Los resultados son orientativos y no reemplazan la consulta médica profesional. Antes de tomar decisiones con impacto, consultá con un médico, nutricionista o profesional de la salud matriculado.

Frequently asked questions

What are normal testosterone levels for a 40-year-old man?

For the 40–49 age bracket, the normal range is 450–750 ng/dL based on NHANES population data and Endocrine Society/AUA clinical guidelines. Below 450 ng/dL is considered low for that age group, and below 315 ng/dL (70% of the lower limit) is classified as very low.

What is considered a normal total testosterone level for adult men?

The broadly accepted normal range for adult men is 300–1,000 ng/dL, but this wide range spans all ages. Age-matched ranges are more clinically meaningful: men in their 20s typically run 600–900 ng/dL, while men over 60 average 300–600 ng/dL. The harmonized reference interval from large U.S. population data (NHANES III) is 264–916 ng/dL for men 19–39.

At what testosterone level is a man considered to have low testosterone (hypogonadism)?

Medical societies disagree slightly on the cutoff. The American Urological Association (AUA) uses < 300 ng/dL; the Endocrine Society uses < 264 ng/dL (9.2 nmol/L). A diagnosis of hypogonadism requires at least two low morning measurements plus consistent symptoms — a single low result is not diagnostic on its own.

Why does testosterone have to be measured in the morning?

Testosterone follows a circadian rhythm: it peaks between 7–10 AM and can be 20–25% lower by mid-afternoon. A late-afternoon draw can produce a result that appears borderline low in a man whose morning level is perfectly normal. Most guidelines specify that samples should be collected before 10 AM.

How fast does testosterone decline with age?

After the peak in the late teens/early 20s, total testosterone declines approximately 1–2% per year from around age 30 onward. By age 70, average levels are roughly 35–40% lower than at peak. The decline is gradual — unlike the abrupt hormonal shift in female menopause — which is why age-matched ranges differ by only 100–200 ng/dL per decade.

What symptoms suggest low testosterone?

Classic symptoms include persistent fatigue, reduced sex drive, erectile dysfunction, decreased muscle mass and strength, increased body fat (especially abdominal), depressed mood or irritability, difficulty concentrating, and reduced bone density. None of these symptoms is specific to low testosterone, so lab confirmation is essential before attributing them to hypogonadism.

What is the difference between total testosterone and free testosterone?

Total testosterone measures all circulating testosterone, but about 98% is bound to proteins (SHBG and albumin). Free testosterone — roughly 1–3% of total — is the biologically active fraction. Some men with normal total testosterone but high SHBG have low free testosterone and experience symptoms. If your total testosterone is borderline, ask your doctor to also measure free testosterone and SHBG.

Can lifestyle changes raise testosterone levels naturally?

Yes, to a meaningful extent. The strongest evidence supports: resistance training (3–4 sessions/week), adequate sleep (7–9 hours — testosterone is primarily secreted during deep sleep), achieving and maintaining a healthy body weight (obesity significantly lowers testosterone), reducing chronic stress (cortisol suppresses testosterone production), and correcting vitamin D deficiency. These changes can raise testosterone by 100–200 ng/dL in men who are currently low for modifiable reasons.

What is testosterone replacement therapy (TRT) and who needs it?

TRT is medical treatment — via injections, gels, patches, or pellets — that restores testosterone when levels are confirmed low (two morning tests) AND the patient has symptoms. It is prescribed by an endocrinologist or urologist after ruling out secondary causes. TRT is not appropriate for men with normal levels, men hoping to preserve or increase fertility (it suppresses sperm production), or men with untreated prostate cancer.

Does this calculator account for nmol/L results?

No — all ranges are in ng/dL. If your lab report is in nmol/L (common outside the U.S.), convert it by multiplying by 28.8. For example, 17 nmol/L × 28.8 = 489.6 ng/dL. Then enter the ng/dL value into this calculator.

Sources & references

Methodology & trust

Editorial

Calculadora de salud revisada por el equipo editorial de Hacé Cuentas, contrastada con Endocrine Society – Testosterone Therapy in Men With Hypogonadism: Clinical Practice Guideline, según nuestra política editorial y metodología.

Updates

Última revisión: June 22, 2026. Los parámetros se verifican periódicamente con las fuentes citadas.

Privacy

Calculations run 100% in your browser. We do not store or transmit your data.

Limitations

Indicative results. For critical decisions, consult a professional.

📌 How to cite this calculator

Rodríguez, M. (2026). Normal testosterone levels by age in men. Hacé Cuentas. https://hacecuentas.com/testosterone-normal-levels-by-age-men

Contenido bajo licencia CC-BY 4.0 — reutilizable citando la fuente con enlace a Hacé Cuentas.

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