How to Measure Penis Size and Track Gains from Jelqing and Penis Extenders

– BPEL (Bone-Pressed Erect Length): Erect length measured along the top side of the shaft from the pubic bone (with the ruler gently pressed to compress the fat pad) to the tip of the glans. Most comparable metric across individuals and time.

– NBPEL (Non–Bone-Pressed Erect Length): Same as above without pressing into the bone. Sensitive to weight changes because the fat pad varies; useful as a “real-world” visual length metric.

– FSL (Flaccid Stretched Length): Maximum gentle stretch of the flaccid penis measured along the top side from the pubic skin line to the tip. Often a leading indicator of future erect length gains.

– FL (Flaccid Length): Natural, un-stretched flaccid length along the top side from the pubic skin line to the tip.

– Girth positions:

– MSEG (Mid-Shaft Erect Girth): Circumference at the midpoint of the shaft.

– BEG (Base Erect Girth): Circumference at the base, near the pubic bone.

– GEG (Glans/Coronal Erect Girth): Circumference just behind the ridge of the glans.

Include flaccid girth (mid-shaft) for completeness.

Tools you need

– A rigid, straight ruler with clear millimeter markings (metal or hard plastic).

– A soft, non-stretch tailor’s tape; or a piece of non-stretch string plus a ruler for circumference.

– A skin-safe, fine-tip marker to mark measurement landmarks (mid-shaft, base) for consistent girth positions.

– A smartphone with camera and a level app (or a small carpenter’s level) to keep your ruler and shaft angle consistent.

– A mirror for alignment and a stable surface or tripod for photo consistency.

– A spreadsheet or notes app (or a printed template) for logging.

Standardize your conditions

– Temperature: Measure in a warm environment. Aim for a comfortably warm room or right after a warm shower. Cold increases shrinkage variability.

– Hydration: Stay consistent. Measure at a similar hydration level to reduce variability in vascular fullness.

– Erection quality (EQ): Use a 1–10 scale. Erect measurements should be at 9–10. Log your EQ rating alongside measurements.

– Timing: Pick a consistent window, ideally morning, 24–48 hours after your last intense session (jelq or extender), not immediately post-training. Avoid measuring right after sex or ejaculation.

– Angle: Hold the erection at a consistent angle relative to the body (e.g., 90 degrees straight out). Log the chosen angle and stick with it.

Step-by-Step Protocols: Baseline Week, Length, Girth, and Visuals

Lock in your starting line with a structured baseline week, then follow repeatable steps for each metric. This prevents chasing noise and gives you a clear comparison point for before-and-after from jelq and extender work.

Baseline week protocol

– Choose two measurement days in the same week (e.g., Tuesday and Saturday), at the same time of day.

– On each day, take three readings per metric (BPEL, NBPEL, MSEG, BEG, GEG, FSL, FL, flaccid girth). Average the three readings for that day. Then average the two days for your official baseline.

– Take standardized photos on Day 1 and Day 7.

How to measure BPEL (bone-pressed erect length)

1) Achieve a full erection (EQ 9–10). Stand or sit so you can hold a consistent 90-degree shaft angle relative to your torso. Log the angle.

2) Place the ruler along the dorsal (top) side of the shaft, zero end at the pubic bone. Press just enough to fully compress the fat pad without discomfort. Keep the ruler straight and level.

3) Align the ruler with the centerline of the shaft; don’t angle it to chase extra length.

4) Read the measurement at the tip of the glans (not including any overhang of skin). Record to the nearest millimeter.

5) Repeat three times, briefly resting between attempts, and average.

How to measure NBPEL (non–bone-pressed erect length)

1) Use the same erection angle and stance as for BPEL.

2) Place the ruler along the top side with the zero at the pubic skin line without pressing into the fat pad.

3) Read at the glans tip. Repeat three times and average.

How to measure girth (MSEG, BEG, GEG)

1) Mark your girth points: base (just above where the shaft meets the body), mid-shaft (halfway between base and glans), and just behind the coronal ridge.

2) With EQ 9–10, wrap a soft, non-stretch tape around the shaft at each point. Hold the tape snug against the skin without indenting tissue. If using string, mark the overlap and measure on a ruler.

3) Record each position to the nearest millimeter. Repeat each position three times and average.

Flaccid metrics: FL, FSL, flaccid girth

– FL: In a warm room, stand naturally. Place the rigid ruler along the top side from the pubic skin line to glans tip. Don’t pull or push. Take three readings and average.

– FSL: Grasp behind the glans and gently stretch along the shaft axis until you meet a firm, consistent stop (don’t yank). Hold 2–3 seconds, then measure along the top side from pubic skin line to glans tip using the rigid ruler. Repeat three times and average.

– Flaccid girth (mid-shaft): Use the same tape method as erect girth. Repeat three times and average.

Photo and video standardization

– Angles: Capture at least two standardized angles—top-down (ruler on top) and side profile (ruler visible). Keep the shaft angle consistent in both.

– Distance and framing: Place the camera at a fixed distance (e.g., arm’s length) or use a tripod at a marked floor spot. Keep the frame consistent using the same mirror or backdrop.

– Lighting: Bright, even light from the front to reduce shadows and distortion.

– Reference: Include the ruler in-frame for scale. If you prefer discretion, a credit card (85.6 mm long) can serve as a size reference.

– Privacy: Store files in a private, labeled folder with the date and angle. Avoid cloud auto-uploads if you don’t want them synced.

Tracking Jelq and Extender Inputs: When to Measure, What to Log, and How to Reduce Error

You’ll get the clearest picture by pairing disciplined measurements with disciplined input logs. That means quantifying extender settings and jelq volume, then measuring on a schedule that filters out short-term fluctuations.

Extender-specific tracking

– Device details: Model, base style, and whether it’s strap, cradle, or vacuum-based.

– Rod length: Total rod length or screw turns used. Note exact settings each session.

– Tension indicator: Record the band or mark (e.g., 600 g, 900 g) if your device shows force. If not, log the subjective pull as low/medium/high with notes.

– Fit settings: Strap hole or notch used, cup setting, and any padding.

– Wear time: Total minutes per session and total daily wear hours. Note continuous vs split blocks.

– Session notes: Slippage, skin irritation, or need to re-seat. This helps interpret stalls or anomalies in FSL.

Reference our Extender Tension & Wear-Time Guide and Extender Troubleshooting Guide for deeper device-specific tuning.

Jelq volume tracking

– Session length: Minutes actively jelqing (exclude warm-up/cool-down).

– Stroke count and cadence: Estimated total reps and seconds per stroke (e.g., 3–4 seconds).

– Erection level during jelq: Average EQ band (e.g., 40–70% for standard jelq).

– Pressure scale: A 1–10 subjective pressure rating; track your average and peak.

– Frequency and rest days: Days per week and any deloads.

Reference our Beginner’s Guide to Jelqing and Jelqing Safety Tips for technique calibration and volume planning.

When to measure

– Monthly checkpoints: Do a full measurement battery (BPEL, NBPEL, all girths, FSL, FL, flaccid girth) once per month, 24–48 hours after your last intense session, at your standard time.

– Weekly indicator: FSL can be checked weekly as a leading signal for length progress, especially for extender users.

– Avoid post-session noise: Don’t measure within 12–24 hours of heavy jelq or long extender wear to avoid edema-driven overreads.

Data logging template (columns you can copy)

– Date and time

– Conditions: Room temp (warm/cool), hydration (low/normal/high), EQ (1–10), angle used

– BPEL, NBPEL

– MSEG, BEG, GEG

– FSL, FL, flaccid girth

– Photos: Yes/No and angle labels

– Extender: Device, rod length/tension indicator, wear time (per session and daily total), notes

– Jelq: Minutes, reps, EQ band, pressure (avg/peak), frequency

– Recovery/context: Sleep hours, training breaks, intense cardio/leg day notes

– Sexual metrics: Morning erections (Y/N), IELT (minutes), ejaculation control rating (1–10), libido rating (1–10)

Reduce measurement error

– Repeats and averages: Always take three readings per metric per session.

– Outlier handling: If one reading is clearly off (e.g., >3 mm from the other two), retake and discard the outlier.

– Minimal detectable change: Treat changes under 2–3 mm as normal noise. Confirm a gain by seeing it persist across at least two monthly checkpoints or by corroborating with both FSL and BPEL moving in the same direction.

– Consistency rules: Same tools, same angle, same time window, same environment.

Make Sense of Your Numbers: Interpreting Progress and Avoiding Common Mistakes

Your data will tell a clear story when you know what each metric reflects and what patterns to look for. Use these guidelines to separate durable gains from short-lived effects and to refine your training inputs from your outputs.

What different metrics tend to signal

– FSL leads length gains: Many extender users see FSL climb before BPEL does. A steady FSL uptick over weeks often predicts a later BPEL increase.

– BPEL is the gold standard for erect length: It controls for fat pad changes and allows better month-to-month comparisons than NBPEL.

– NBPEL reflects real-world visuals: Useful for how you look without pressing, but it will vary with body composition.

– Girth moves with vascular changes: Jelq often shows early changes in MSEG and BEG. Verify girth gains at multiple positions to see whether expansion is even or base-heavy.

Differentiate temporary swelling from true gains

– Edema/pump: After intense jelq or a long extender block, girth can read higher for 12–24 hours. If a gain vanishes by your next baseline-time reading, treat it as temporary.

– EQ boosts: Improved erection quality can increase NBPEL and girth without any tissue lengthening. Track EQ so you can attribute part of an increase to better hardness.

– Weight changes: If NBPEL drops while BPEL stays flat, increased fat pad thickness is the likely cause.

Progress patterns to value

– Converging signals: FSL up first, then BPEL up, with stable or improving EQ. That’s classic length progress.

– Plateaus: If BPEL and FSL are flat for 6–8 weeks while inputs are consistent, adjust one variable at a time—extender tension or wear-time distribution, or jelq volume/pressure. See our Balanced Extender Routine and Extender Tension vs Wear-Time guides for structured adjustments, and our Jelqing Routines coverage for volume progression ideas.

Common measurement mistakes to avoid

– Bending the ruler or measuring at an angle to gain extra millimeters.

– Changing erection angle between sessions.

– Pressing inconsistently for BPEL or pressing at all during NBPEL.

– Pulling the tape too tight for girth, creating indentations and inflated numbers.

– Measuring in a cold room or right after a shower without giving time for tissue to normalize.

– Measuring right after edging or ejaculation; arousal state can transiently alter size.

– Switching tools mid-protocol (e.g., a different tape or ruler brand) without recalibrating.

Sexual wellness side metrics: track what matters beyond size

– EQ (1–10): Capture erection strength and sustainability.

– IELT (intravaginal ejaculation latency time): Use a timer from penetration to ejaculation. Log weekly averages to gauge stamina changes.

– Ejaculation control: Rate perceived control from 1–10 and note any sex techniq practice you’re adding (e.g., breathing, arousal pacing). Correlate improvements with training blocks.

– Libido: A 1–10 appetite scale. Fluctuations can reflect stress, sleep, or overwork—useful context for interpreting EQ and size data.

Quick-reference checklist

– Standardize: tools, angle, time, temperature, hydration, EQ.

– Measure: BPEL, NBPEL, MSEG, BEG, GEG, FSL, FL, flaccid girth—three readings each, average.

– Log inputs: Extender device/rod/tension/wear time; jelq minutes/reps/EQ/pressure.

– Schedule: Weekly FSL; monthly full battery.

– Confirm gains: Look for changes >2–3 mm persisting across two checkpoints and aligning with FSL and BPEL trends.

– Adjust training: Make one change at a time based on the data. For extenders, see our Extender Tension & Wear-Time Guide and Extender Troubleshooting Guide. For jelq programming, see our Beginner’s Guide to Jelqing and Jelqing Safety Tips.

Conclusion: Data-Driven Gains for Mens Sexual Wellness

Progress isn’t a hunch—it’s a number you can verify. By standardizing your setup, measuring with a precise protocol, and logging extender and jelq inputs, you’ll know exactly what’s working, how fast, and where to optimize. Use BPEL and FSL to anchor length tracking, measure girth at multiple points for a complete picture, and correlate size metrics with EQ, IELT, ejaculation control, and libido to capture the full impact on performance. Whether you favor a penis extender or penis stretcher setup, a jelq-centric approach, or a hybrid plan, this measurement system keeps you honest and motivated. Keep your methods tight, your logs clean, and your adjustments deliberate. That is how you turn training into measurable, lasting results.