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Last updated April 24, 2020. 2 minute read

What are normal testosterone levels in men?

According to the American Urological Association (AUA), having a value below 300 ng/dL is a “reasonable cut-off” to be diagnosed with low testosterone. But it’s a large spectrum, and many healthy guys fall at different places within this range.

Written by Grant Stoddard
Reviewed by Dr. Mike Bohl, MD, MPH

The exact cut-offs for normal testosterone levels in men vary, but estimates typically range from 270–1,070 ng/dL. According to the American Urological Association (AUA), having a value below 300 ng/dL is a “reasonable cut-off” to be diagnosed with low testosterone (AUA, 2018). It’s a large spectrum, and many healthy guys fall at different places within this range. Because when it comes to testosterone levels, “healthy” means something different to everyone. (For comparison, healthy testosterone levels in women are much lower.)

Vitals

  • Your testosterone levels depend largely on three factors: age, genetics, and existing medical conditions.
  • The exact cut-offs for normal testosterone levels in men vary, but estimates typically range from 270–1,070 ng/dL.
  • Testosterone levels also fluctuate throughout the day. Testosterone peaks in the morning and dips later on.
  • Symptoms of low testosterone include tiredness, irritability, depression, reduced interest in sex, reduced lean muscle mass, and erectile dysfunction.

What determines testosterone levels?

Your testosterone levels depend largely on three factors:

  • Age
  • Genetics
  • Existing medical conditions

It is commonly reported that testosterone levels peak in the late teens/early 20s and then decline by about 1% per year thereafter. Some research supports these statements, such as one study that found testosterone levels peaked at age 19 (Kelsey, 2014). Levels do then decline, but the exact amount they decline each year—and whether this is primarily driven by age or other factors—is less clear.

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Testosterone levels fluctuate

Testosterone levels also fluctuate throughout the day. Testosterone peaks in the morning and dips later on. That’s why it’s better to get your testosterone levels checked between 8 a.m. and 10 a.m. Before a diagnosis of low testosterone can be made, levels are checked at least twice (Snyder, 2020).

Symptoms of low testosterone

According to the AUA, symptoms of low testosterone include tiredness, irritability, depression, reduced interest in sex, reduced lean muscle mass, and erectile dysfunction (Urology Care Foundation, n.d.). If you think you may have low testosterone, talk to a healthcare provider.