Do you actually have low T, or are you just getting older? This free checker runs your answers through the ADAM questionnaire — a validated 10-question low-testosterone screen developed at Saint Louis University — and combines it with a 5-factor lifestyle risk assessment to tell you whether your symptoms warrant a real bloodwork conversation with your doctor. It's the same screen that's been used in primary care for over two decades, wrapped in a tool that also shows your age-banded reference range and flags which lifestyle levers are working against you.
Start with your age. The calculator immediately shows the normal total testosterone range for your age band and the AUA threshold for clinical low T. Then answer the 10 ADAM questions and the 5 lifestyle factors. Your result lands in one of two buckets — Positive Screen or Negative Screen — plus a Smart Analysis that grades your overall risk picture and prioritizes your top 3 fixable levers.
Enter your age first because the normal range shown depends on it. Total testosterone declines gradually after the early 30s — roughly 1–2% per year — so a 450 ng/dL reading means something different for a 35-year-old than for a 65-year-old. The calculator shows you the age-banded normal range the moment you enter your age: for men 19–39 it's 264–916 ng/dL (the Travison harmonized range), for 50–59 it's 216–876, for 70+ it's 156–818 (Massachusetts Male Ageing Study). Two different "low" numbers matter and the calculator shows both: your age-band statistical floor (the bottom 2.5% for your age) and the fixed clinical cutoff — the American Urological Association uses 300 ng/dL (the Endocrine Society and harmonized lower limit is 264), the same at every age, confirmed by two separate morning draws before any diagnosis. Knowing your range before you answer the symptom questions tells you whether mild symptoms are "expected aging" territory or real outliers worth investigating.
The ADAM questionnaire has 10 questions but they are not weighted equally. Q1 (decreased sex drive) and Q7 (weaker erections) are the two "KEY" questions, marked in the calculator with a purple KEY tag. Answering yes to either one flags a positive screen on its own. This is how the original Saint Louis University validation study designed it — sexual symptoms are the single strongest predictor of clinical low T, more predictive than fatigue, mood, or physical changes. The other eight questions cover energy, mood, and physical changes, and you need to answer yes to at least three of them to trigger a positive screen if Q1 and Q7 are both no. This is why honest answers to Q1 and Q7 matter more than any of the lifestyle questions — they're your fastest path from symptoms to a real conversation with your doctor.
The calculator asks about five modifiable factors and each one maps to a mechanism that directly moves testosterone. BMI is the single biggest lever — fat tissue contains aromatase, the enzyme that converts testosterone to estrogen, so obese men commonly run 50-100 ng/dL lower total T than lean men of the same age, and losing 10-15% body weight usually reverses this within months. Sleep is second — most of your daily testosterone is produced during REM and deep sleep, so chronically sleeping under 6 hours drops T by 10-15% within a week. Exercise matters but only the right kind: heavy resistance training (squats, deadlifts, rows) moves the needle; cardio alone barely does. Alcohol above 7 drinks/week directly suppresses Leydig cell T production and increases aromatase activity. Stress raises cortisol, which has an inverse relationship with T — chronic cortisol elevation directly suppresses production. These five show up in priority order inside Smart Analysis based on how high you scored on each.
Below the age chart, the calculator shows a free-testosterone breakdown that most symptom checkers skip entirely. Here's why it's there: the total testosterone number your doctor usually orders includes a huge fraction that's biologically inactive. Only about 1–2% of your testosterone is free (unbound and active); roughly 44% is loosely bound to albumin, and about 54% is locked to SHBG (sex hormone-binding globulin) and effectively useless. The catch for men 40–60: SHBG rises about 1% per year with age, so an older man can show a perfectly normal total T while his free T — the part that actually does anything — has quietly dropped into deficiency. The card flags this automatically, and if you're 50+ it shifts to an amber warning tone. The practical takeaway is in the card and in your Smart Analysis actions: when you get bloodwork, ask specifically for free testosterone and SHBG, not just total, or a real deficiency can hide behind a "normal" result.
Below the hero card, the Symptom Domains panel breaks your 10 yes/no answers into four clusters: Sexual Function (Q1, Q7), Energy & Vitality (Q2, Q3, Q8, Q9), Mood & Cognition (Q5, Q6, Q10), and Physical Changes (Q4 — height loss). Each domain has a progress bar showing how many symptoms you flagged out of the total in that cluster. This matters because the domain pattern sometimes points to a specific cause. Sexual-only flags with no energy or mood issues can point to vascular problems or SSRIs rather than low T. Mood-and-energy flags without sexual symptoms often turn out to be depression or burnout rather than T. Physical changes (height loss in Q4) suggest bone density issues which are downstream of low T but need their own workup. Use the domain breakdown to help your doctor focus the differential — don't just walk in and ask for TRT.
The hero card lands on one of two results and neither one is a diagnosis. A Positive Screen means the ADAM criteria are met (Q1=Yes, Q7=Yes, or 3+ other yes answers) and your symptom pattern is consistent with low T — but it does NOT mean you have clinically low testosterone. The ADAM test has good sensitivity (88%) but low specificity (60%), which means it catches most true low-T cases but also flags a lot of men whose T is actually normal. A positive screen is a trigger to get bloodwork, not a diagnosis. A Negative Screen means your symptom cluster isn't strongly suggestive of androgen deficiency today — but it doesn't rule it out either, especially if your total T is trending down from prior years. If you still feel off despite a negative screen, get bloodwork anyway. Either way, the hero card's big number (symptoms out of 10) is the quick reference; the letter grade in Smart Analysis combines this with your lifestyle risk for a fuller picture.
If your screen is positive, the action list in Smart Analysis will put bloodwork at position #1. Here's what to ask for: total testosterone, free testosterone, SHBG, LH, FSH, estradiol, and a basic metabolic panel. Draw the blood before 10am because testosterone peaks in the morning, fast beforehand, and get it done twice on separate days — the AUA requires two consistent low readings before they'll call it clinical low T, because a single reading can be noisy. Also ask your doctor to rule out other causes that mimic low T: thyroid dysfunction, sleep apnea (extremely common in overweight middle-aged men), depression, chronic opioid or statin use, and untreated diabetes. Many men who screen positive on ADAM actually have sleep apnea or depression rather than primary hypogonadism — treating the underlying cause often fixes the symptoms without ever needing testosterone replacement therapy.
This calculator is a screening tool, not a diagnostic one. The ADAM questionnaire's low specificity (60%) means roughly 4 out of 10 men who screen positive will have normal testosterone on bloodwork — you cannot skip the lab test. The lifestyle risk score is based on well-established mechanistic relationships but is not a validated clinical instrument. The age-banded reference ranges use midpoints from population studies; your individual normal may sit anywhere within the range shown. Smart Analysis recommendations are rule-based and do not constitute medical advice. Testosterone replacement therapy has real risks (polycythemia, fertility suppression, potential cardiovascular concerns depending on the patient) and should only be discussed with a qualified physician after two confirmed low readings and exclusion of reversible causes. If you're on medications known to suppress testosterone (opioids, finasteride, SSRIs, corticosteroids), talk to your prescriber before anything else — the fix may be changing the medication, not adding TRT.