Quick Answer: The correct way to measure your penis is to use a rigid ruler for length and a flexible measuring tape for girth, both during a full erection, with the ruler pressed to the pubic bone for accurate results.
- Penis size measurement should be done while fully erect for length and girth accuracy.
- Use a rigid ruler for length and a flexible tape measure for girth.
- Always measure bone-pressed erect length (BPEL) for a medically accurate reading.
- Measure girth at the thickest part of the shaft, usually mid-shaft.
- Rejuvall uses these measurements to determine medically appropriate options for penile girth enhancement, non-surgical lengthening, or combination procedures.
- Measurement accuracy affects filler volume, safety limits, and procedural results.
- A free AI-powered assessment quiz is coming soon to help men match their size and goals to the right treatment options.
- Measuring is completely private, easy to do at home, and essential before seeking any enlargement.
Introduction: Why Measuring Matters
At Rejuvall, one of the first questions patients ask is, “Do I need to measure myself before my consultation?”
The answer is yes—if you’re considering penile enhancement, knowing your starting size helps us determine which procedure or combination of procedures you’re a candidate for.
Knowing how to measure your penis accurately helps you get a baseline so you can have realistic expectations when setting your size goals.
Accurate measurement is also a foundational step in addressing broader issues related to confidence, sexual function, and intimate performance. For a comprehensive look at these topics, visit our Men’s Health page, where we explore everything from erectile performance to enhancement procedures guided by expert urologic care.
Unfortunately, many men don’t know how to measure correctly—or they’ve been given inaccurate instructions from online forums or misleading enhancement websites.
That’s why we created this medically accurate, easy-to-follow guide that will show you how to measure both penile length and girth properly, without guesswork.
The Medical Standard: What “Penis Size” Actually Means
Penis size can be measured in two key ways:
- Length: The distance from the pubic bone to the tip of the glans while fully erect.
- Girth: The circumference of the shaft while fully erect.
There’s no medically accepted measurement that involves measuring while flaccid. That’s because flaccid size can vary based on temperature, anxiety, hydration, and other factors. For enhancement planning, only erect length and erect girth are clinically relevant.
How to Measure Your Penis Length
Penile length should always be measured from the top side (dorsal view) of the penis, from the pubic bone to the tip of the glans.
Tools You’ll Need:
- A rigid ruler (plastic or metal)
- A private space and a mirror (optional but helpful)
Step-by-Step Instructions:
- Achieve a full erection – You must be at full erection to get an accurate reading. Partial erections will underestimate true size.
- Press the ruler into the pubic bone – Position the ruler on the top of the penis (facing upward), then press it firmly into the pubic bone. This compresses the fat pad and gives you your bone-pressed erect length (BPEL).
- Record the measurement – Look straight down or use a mirror to read the measurement from the base (bone-pressed) to the tip of the glans.
- Repeat 2–3 times – Do multiple measurements across different days or times of day for consistency. Take the average of your results.
Tip: Avoid measuring from the side or bottom, and never measure from the skin (non-bone-pressed), as this will yield a shorter and inconsistent number.
How to Measure Your Penis Girth
Girth refers to circumference—how thick the penis is when wrapped around.
Tools You’ll Need:
- A flexible measuring tape (tailor’s tape is ideal)
- If unavailable: use string and a ruler
Step-by-Step Instructions:
- Get fully erect – Just like with length, your penis must be fully erect to get an accurate girth reading.
- Wrap the measuring tape around the thickest part of the shaft – This is usually mid-shaft, but for some men it may be closer to the base or just behind the glans. Choose where your penis is naturally thickest.
- Record the number where the tape overlaps – Make sure the tape is snug, not tight. You should not be squeezing or compressing the shaft.
- Repeat at three locations for accuracy –
o Base of the shaft
o Mid-shaft
o Just behind the glans
Average the three for your most useful number.
Note: If you use a string, mark the overlap point, then measure that length with a ruler.
What Is the Average Penis Size?
Many men ask us how they “compare,” but the truth is that there’s wide variation in penis size, and what’s considered “average” depends on how it’s measured.
According to peer-reviewed urology research:
- Average erect length: 5.1 to 5.5 inches (bone-pressed)
- Average erect girth: 4.6 to 4.9 inches (mid-shaft)
At Rejuvall, we emphasize that size is not the same as satisfaction—and that confidence, proportion, and functionality matter far more than raw numbers.
Our goal is never to sell “size” but to create safe, natural-looking, and functional enhancements for each individual.
Why Accuracy Is Essential for Penile Enhancement
If you’re considering penile girth enhancement or penis lengthening, your measurement isn’t just for curiosity—it affects what’s medically possible.
Your size affects:
- How much filler or graft material your penis can accept safely
- How skin elasticity and penile mobility affect procedure planning
- What type of lengthening approach is best for you
A man with a 6.5″ penis length and 5.0″ girth may be able to safely receive more filler volume than someone with a 4.5″ penis length and 3.5″ girth. These measurements also influence whether you might benefit from additional procedures like:
- Circumcision (required for girth fillers)
- Scrotal webbing correction
- MAXL non-surgical lengthening or MegaMAXL surgery
What Is Bone-Pressed Length and Why Is It Important?
“Bone-pressed erect length” (BPEL) is the clinical standard used by urologists, researchers, and cosmetic enhancement experts.
It involves pressing the ruler past the fat pad until it touches the pubic bone. This eliminates variation caused by body fat and posture, making it the most consistent measurement.
Without BPEL, your length can vary by up to 1.5 inches depending on how much fat is overlying the pubic bone.
This is especially important for:
- Obese or overweight patients
- Men with buried penis or turtling syndrome
- Patients undergoing pubic fat pad liposuction
Why Girth Matters More Than Most Men Think
Most men focus on length, but girth is often the more important factor for both aesthetics and partner sensation.
That’s why most of Rejuvall’s non-surgical enhancement patients choose to increase girth using:
- Hyaluronic Acid (HA) – soft, natural feel, lasts 12–48 months
- PMMA Filler – long-lasting dermal filler for permanent girth
Even small girth gains—0.5 to 1.5 inches—can produce dramatic visual and functional changes.
Pro Tip: Girth increases your penis’s perceived size and can significantly improve sexual confidence.
Why Rejuvall Recommends Self-Measuring at Home
Some clinics perform measurements during in-office visits, but at Rejuvall, we encourage patients to measure at home first for several reasons:
- Privacy and comfort: You can do it alone, in a relaxed environment.
- Consistency: You can repeat it over several days to get accurate averages.
- Preparation: It gives you a head start before your free consultation.
We use your self-reported data to begin building a preliminary treatment plan, which is later confirmed in your clinical consultation.
What If My Measurements Change Over Time?
It’s normal to see small fluctuations in erect size due to:
- Stress and anxiety
- Blood flow or temperature
- Time of day or fatigue
- Weight gain or loss (especially around the pubic area)
That’s why we recommend averaging multiple measurements over 2–3 days for the most accurate baseline.
If you’ve already had an enhancement procedure and are measuring post-treatment, wait until swelling subsides (2–6 weeks depending on the procedure) before measuring again.
What Comes After Measuring?
Once you have your measurements, here are three things you can do:
1) Schedule a consultation
Rejuvall offers free phone consultations where we’ll review your goals and discuss which options might work best for your anatomy.
2) Try our AI-powered assessment tool (coming soon)
Soon, we’ll launch an interactive, anonymous quiz to help match your goals and measurements to your best procedure options. Stay tuned.
3) Explore procedures
Learn more about the surgical and non-surgical enhancement solutions we offer:
Final Thoughts: It All Starts with the Right Measurement
Measuring your penis might feel awkward—but it’s essential for setting realistic expectations and pursuing any form of medically guided enhancement.
At Rejuvall, we don’t believe in a one-size-fits-all solution. Every patient is evaluated based on their anatomy, goals, sexual function, and health status to build a personalized path to transformation.
Start with a ruler and a tape measure. The rest? We’ll guide you through it.
Dr. Steven L. Morganstern, M.D.
Dr. Morganstern is an internationally acclaimed, board-certified urologist, surgeon, and best-selling author specializing in men’s sexual health. A pioneer in erectile dysfunction therapeutics, Dr. Morganstern was the only private clinician selected for the original Viagra trials and has spent over four decades advancing treatments in ED, cosmetic urology, hormone replacement, and prostate health.