Free Testosterone Range: What is good?

Total Testosterone doesn't tell the full story about your Testosterone levels. You should also be looking at Free Testosterone, as it is the one that matters.

Men have all sorts of hormones in our bodies that helps them live and gives a smile. One of the many amazing male hormones is testosterone.

You’ve probably heard about this hormone at some point in your life. And, it is no secret this hormone plays a very important role in the lives of men.

Testosterone is basically responsible for the development of a males physical features – facial hair and muscle mass.

Testosterone’s responsibility isn’t just to make men look good. It’s also the primary male sex hormone responsible for maintaining a healthy sex-drive, building a strong skeletal system, and even plays a role in brain function – specifically memory and mood.

Unfortunately, as men age, they will begin to experience a decline in testosterone levels (also known as hypogonadism).

Some men may even have low Free Teststerone (active Test) at a young age, do to high levels of Sex Hormone Binding Globulin.

Here, we will discuss what typical testosterone levels in males are, as well as help understand the values and why they are important to maintain at a healthy level at any age.

Key Takeaways

  • Testosterone is required at each stage of life for proper growth and function.
  • It is crucial to recognize that the primary cause of diminishing testosterone levels as men age is simply aging.
  • Testosterone levels decline by approximately 110 ng/dL every decade [4]
  • Free Testosterone is the active Testosterone that actually matters
  • Factors that impact normal testosterone levels can be attribute to smoking, diet, poor exercise, drug abuse, immune diseases, or steroid use

Testosterone Levels in Men by Age

It is important to know that testosterone levels will differ from man to man. In fact, there is actually a wide range of what is considered a “normal range.”

However, the average male testosterone level is said to be anywhere between 270 to 1070 ng/dL, with adult males with testosterone levels below 300 ng/dL being classified as having low testosterone levels by the American Urology Association (AUA).

Testosterone levels in males lower once past the age of 25, on average

When males grow and enter puberty, testosterone levels will spike and peak in their 20s and 30s. By the time they are 50, testosterone levels will have declined.

It is said that after 30, testosterone levels gradually decline by about one percent each year. Let’s explore this by age.

Testosterone Levels at Birth

Testosterone is essential for normal development in the womb. [1] At birth, most males will have low levels of testosterone in their system. This is nothing to worry about as their levels will gradually increase throughout childhood.

During the next stage in their life, after birth, testosterone levels will surge and provide the fuel for the puberty growth spurt.

Testosterone Levels for an Adolescence to Young Adult

During puberty, testosterone levels will increase dramatically. This is essential for the development of male sexual characteristics. From birth to about age 12, testosterone levels continue to remain quite low. However, they will gradually increase as they near puberty, reaching the a high around age 16 or 17.

Approximate Range of Normal Testosterone Levels by Age (men):


The age of a child is generally defined as being between birth and puberty. Range is approximately 1.8-400 ng/dL.


An adolescent is a person aged 13 to 18 years old. Range of normal testosterone levels is between 240-950 ng/dL


An adult is a person aged 19 years or older. Normal range of testosterone levels falls between 270- 1070 ng/dL

Due to the rapid hormone change during puberty, these values can change significantly by age. Once a young man reaches adulthood, his testosterone levels should level out and remain relatively stable.

A quick note – clinicians usually follow the American Urology Association’s (AUA) guidelines. According to AUA, testosterone levels below 300 ng/dL are classified as low testosterone.

Normal Testosterone in Adult Males

If you’re reading this, you might be asking yourself a few questions right now, “what if my testosterone is 250 ng/dL? Is that bad?”.

There is a likelihood that the number itself should not warrant you to run out and seek testosterone replacement therapy (the treatment option for men with a testosterone deficiency). Rather, this is an indication to consult with a doctor.

As men age, testosterone levels will gradually decline. This is a natural part of the aging process that every male should be aware of.

Think of it like this, the average man will lose about one percent of his testosterone each year, starting around age 30.

So, if a 70-year-old man has a testosterone level of 400 ng/dL, that would be considered completely normal and nothing to worry about. On the other hand, if a 30-year-old man has a testosterone level of 400 ng/dL, then he may want to consult with a doctor. This is because his testosterone levels should be much higher.

It is also important to note that some men may experience a drop in testosterone levels earlier than others. Here is the average testosterone levels of fully grown adult men by age.

Average Testosterone Level of Men in their 30s

270-975 ng/dL

Average Testosterone Level of Men in their 40s

220-872 ng/dL

Average Testosterone Level of Men in their 50s

200-900 ng/dL

Average Testsosterone Level of Men in their 60s, 70s and beyond

156-820 ng/dL

As you can see, there is still a wide range of what is considered “normal.” However, it is important to keep in mind that these numbers are averages. So, some men may be on the lower end of the spectrum while others may be on the higher end.

Free Testosterone in Males by Age

Age of the male ๐ŸšนTotal Test ๐ŸงฌFree Test ๐Ÿฉธ
20 – 30270-975 ng/dL4.6-18.2 ng/dl
30 – 40220-872 ng/dL4.4-16.51 ng/d
40 – 50200-900 ng/dL3.98-14.9 ng/d
50+156-820 ng/dL2.5-14.1 ng/d
Based off thte “The determination of bio-available testosterone” study published in 1995

What Can I do if I think I have Low Testosterone?

What if one day you begin to notice a decrease in energy or noticed a decrease in your sex drive?

These are two of the most common symptoms associated with low testosterone levels. To be certain this is what you are experiencing, you might want to have your blood tested to make sure this is actually what is wrong.

Your best bet would be to have your Testosterone tested with a company like LetsGetChecked, an online testing company that has more than just Testosterone level tests.

Lets Get Checked Review
LetsGetChecked is the easiest way of checking your Testosterone levels from the comfort of your own home

Testosterone Level: Units

The units that are used when measuring testosterone levels are ng/dL. This stands for nanograms per deciliter. The nanograms is weight while the deciliter is volume.

To give you some perspective, one nanogram is equivalent to one-billionth of a gram while one deciliter is equivalent to 100 milliliters or approximately three and half ounces.

In other words, when your testosterone levels are measured in ng/dL, this is telling you how many nanograms of testosterone are present for every deciliter of your blood.

Because testosterone is typically measured in your blood, the weight amount gives a good indication of how much of the hormone is actually floating around in your blood at any given time.

Think of it like this, if you hold a jar that holds pickles and you struggle to pick it up, you would expect there to be more pickles in the jar due to the effort being exerted in picking it up. This is the same with testosterone levels and the weight measurement of nanograms.

A higher number of nanograms per deciliter typically indicates a higher level of testosterone in your blood.

This is why when doctors are trying to determine if you have a testosterone deficiency, they will often request a blood draw to measure your testosterone levels.

Testosterone: What is it?

Now to explain testosterone.

Testosterone is the most important hormone for men

Testosterone is a natural and essential hormone that is needed for normal development in men. While testosterone is most commonly associated as the hormone that gives men their male features such as hair pattern and deepened voice.

Testosterone has also shown to be important for growth of the skeletal system, development of muscle mass, and has even been shown to play a role in brain function, particularly in the areas associated with memory and mood. [2]

Additionally, testosterone helps with regulating sperm production, descent of the testicles, and libido. [3]

Men with low testosterone levels will typically experience a few key symptoms.

Most Common Symptoms of Low Testosterone

  • decreased libido
  • erectile dysfunction
  • decrease in muscle mass and strength
  • weakened bones as a result of loss in bone mineral density (arthritis)
  • fatigue
  • depression
  • lack of focus
  • hair loss
  • decrease in energy levels

These symptoms can also be signs of other medical symptoms, so it is important to consult with your doctor first.

Why Testosterone Levels Drop?

You know those negative symptoms telling you your testosterone is declining? This isn’t your body’s way of saying it’s done. This is actually your body’s natural way of telling you that it has given you the tools to become an adult and reproduce. Therefore, now it is time to slow down production.

There are many reasons why testosterone levels may drop. The most common reason is age. Testosterone production in men begins to decline gradually after men reach 30; because of this, men tend to experience the symptoms associated with low testosterone as they get older. This is often referred to as male menopause (or andropause). Clinically, this is referred to as late-onset hypogonadism.

According to one study, the average rate in which testosterone decreases in men as they age, starting at age 30 is approximately 110 ng/dL every decade. [4]

Other reasons for drop in Testosterone

There are other reasons, apart from aging, that can also cause a drop in testosterone. Some of which include:

  • poor diet
  • lack of exercise
  • smoking
  • liver disease (from alcohol abuse)
  • chronic drug use
  • AIDS
  • steroid abuse

Surprisingly, a research that investigated men of similar age who led a healthy lifestyle versus those who lived an unhealthy one discovered that those who ate poorly and smoked frequently had drastically lower testosterone levels. [5]

So, if you are noticing some of the signs and symptoms associated with low testosterone, it might be a good idea to consult with your doctor. A simple blood test can easily measure your testosterone levels and give you a better understanding of what’s going on with your body.

Is there Treatment for Low Testosterone?

The easiest way to increase Free Testosterone is to take a Boron supplement which is known to lower Sex Hormone Binding Globulin.

If you are in need of TRT, the best and easiest way is to work through an online TRT clinic. These are legal clinics that work with patients online in order to provide them with the medication they need to get their lives back.

The Clinic we would recommend would be Evolve Telemed HRT. They have high specialized medical doctors and a host of good reviews, and we have had success with them as well.

If you have low testosterone, it is nothing to be ashamed of. In fact, it is a very common condition that can be easily treated.

Other treatments for Low Testosterone:

Another simple way to increase Testosterone levels is to live a healthier lifestyle

Testosterone replacement therapy is not for everyone. Sometimes, it can simply be a matter of making a lifestyle change. Diet and exercise are key factors that influence testosterone levels.

If you are overweight, shedding a few pounds can do wonders for your testosterone levels. Exercise, especially weight lifting, has been shown to be one of the most effective ways to bring one back to healthy testosterone levels. [6]

Discuss the advantages and disadvantages of testosterone replacement therapy with your physician to see if it is a good option for you. You shouldn’t have to suffer through life with low testosterone levels – you deserve happiness and normalcy.

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Hines M. Prenatal endocrine influences on sexual orientation and on sexually differentiated childhood behavior. Front Neuroendocrinol. 2011 Apr;32(2):170-82. doi: 10.1016/j.yfrne.2011.02.006. Epub 2011 Feb 17. PMID: 21333673; PMCID: PMC3296090.

Zitzmann M. Testosterone and the brain. Aging Male. 2006 Dec;9(4):195-9. doi: 10.1080/13685530601040679. PMID: 17178554.

Toppari J, Virtanen H, Skakkebaek NE, Main KM. Environmental effects on hormonal regulation of testicular descent. J Steroid Biochem Mol Biol. 2006 Dec;102(1-5):184-6. doi: 10.1016/j.jsbmb.2006.09.020. Epub 2006 Oct 17. PMID: 17049842.

Morley JE, Kaiser FE, Perry HM 3rd, Patrick P, Morley PM, Stauber PM, Vellas B, Baumgartner RN, Garry PJ. Longitudinal changes in testosterone, luteinizing hormone, and follicle-stimulating hormone in healthy older men. Metabolism. 1997 Apr;46(4):410-3. doi: 10.1016/s0026-0495(97)90057-3. PMID: 9109845.

Sartorius G, Spasevska S, Idan A, Turner L, Forbes E, Zamojska A, Allan CA, Ly LP, Conway AJ, McLachlan RI, Handelsman DJ. Serum testosterone, dihydrotestosterone and estradiol concentrations in older men self-reporting very good health: the healthy man study. Clin Endocrinol (Oxf). 2012 Nov;77(5):755-63. doi: 10.1111/j.1365-2265.2012.04432.x. PMID: 22563890.

Craig BW, Brown R, Everhart J. Effects of progressive resistance training on growth hormone and testosterone levels in young and elderly subjects. Mech Ageing Dev. 1989 Aug;49(2):159-69. doi: 10.1016/0047-6374(89)90099-7. PMID: 2796409.

Yao Q, Zhou G, Xu M, Dai J, Qian Z, Cai Z, Zhang L, Tan Y, Hu R. Blood metal levels and serum testosterone concentrations in male and female children and adolescents: NHANES 2011-2012. PLoS One. 2019 Nov 7;14(11):e0224892. doi: 10.1371/journal.pone.0224892. PMID: 31697766; PMCID: PMC6837506.


Jimmy Diaz M.S.

Jimmy Diaz M.S. | Writer

Jimmy is a Clinical Scientist from Los Angeles with a background in Chemistry and Reproductive Clinical Science. He is an adrenaline junkie who loves water, winter and wind sports. He is dedicated to advancing the field of reproductive science and providing the best patient care while also exploring new experiences and challenging himself.

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