Estimate size gain

How Much Filler To Take

Medically reviewed by Dr Gary HornLast reviewed 28 July 2026

Girth gain depends on both your length and the amount of filler — the same volume thickens a shorter penis more. Use the estimator below for an approximate projected girth.

How big is a 1-inch increase in girth?

To picture an inch of added thickness, use your own hand.

Form a circle with your thumb and index finger.
Spread your thumb and index finger apart by one inch.
See how much bigger that circle becomes.

A one-inch increase in girth is very significant.

A patient asking for a 2 or 3-inch girth gain has unrealistic expectations.

Most patients gain between 0.5 and 1.0 inch, although some have gained over 2 inches — see our before and after photographs. Gaining more than 2 inches of thickness involves significant up-front and ongoing maintenance cost.

If you are in a long-term relationship, it is worth discussing the procedure with your partner beforehand. She may be perfectly happy with your current size.

If you would like a bigger penis purely as a luxury, filler is the most sensible medical approach available.

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The data behind this

Where the average comes from.

The starting girth and “top %” use the most authoritative dataset available — a systematic review of up to 15,521 men, each measured by a health professional using a standard procedure. Average erect girth is 11.66 cm (4.59″). Around 89% of men measure below 13 cm (5.1″), and around 98% below 14 cm (5.5″). The percentile shown is your projected girth's position on this distribution (mean 11.66 cm, SD 1.10 cm).

Reference: Veale D, Miles S, Bramley S, Muir G, Hodsoll J. Am I normal? A systematic review and construction of nomograms for flaccid and erect penis length and circumference in up to 15,521 men. BJU International, 2015;115(6):978–986. doi:10.1111/bju.13010

Caveat: the review is strongest for flaccid girth (n = 9,407); the erect-girth figure is from a smaller subset (n = 381), so erect-girth percentiles are a useful guide rather than exact.

The circles are drawn at life size — each circle's circumference equals the girth shown (diameter = girth ÷ π). Exact on-screen size depends on your display's scale.

Get a precise plan.

Book a consultation at any of our ten US clinics — New York, New Jersey, Los Angeles, San Francisco, Sacramento, Austin, Dallas, Houston, Chicago & Baton Rouge.

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About this page

Last reviewed on 28 July 2026.

Written and medically reviewed by Dr Elliot Heller (MD, FACS), board-certified in Otolaryngology–Head and Neck Surgery, practising cosmetic surgery since 1989.

Information on this page is drawn from the published literature on hyaluronic-acid penile filler and from Androfill’s clinical experience since 2012. It is general information, not a substitute for a consultation — your own suitability, options and risks must be assessed in person by your doctor.