Enter your measurement and see an estimated global percentile.
This uses a simple statistical model (normal distribution) based on commonly-cited research.
No data is stored anywhere — everything runs in your browser.
Tip: For length, measure along the top side from pubic bone to tip.
For girth, wrap a soft tape around the thickest point.
Model: not calculated yet
Estimated percentile
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Enter a value to see your result.
Your input (normalized)
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Approx. z-score
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How to read this
If you’re at the 70th percentile, that means you’re larger than about 70 out of 100 men.
Reference values are based on a large meta-analysis (BJU International, 2015).
You can replace the mean/SD constants in the code if you want a different dataset.