Health Enhancement Products

Bathmate Size Guide

Bathmate sizing is not always simple, and it leads to lots of guys buying the wrong model. For you to get the most of your penile enlargement pump, it is essential to choose the best size for you.

Also, read the full Bathmate and Hydromax review that includes: usage tips, model overview, comparisons, user reviews, and health benefits from pumping.

Before continuing, note that the below guide is based on pumps purchased from the Official Manufacturer. If you are buying through a reseller, the sizing may be different.

Size Chart

You must prepare two dimensions: erection length and erection girth.


Pump Name

Hydromax X20 (S)7.5 inches (19.1 cm)5.5 inches (14.0 cm)Up to 5.0 inches (12.7 cm)Up to 3.8 inches (9.6 cm)
Hydromax X20 Xtreme (S)
Hercules (M)8.5 inches (21.6 cm)6.7 inches (17.0 cm)Up to 7.0 inches (17.8 cm)Up to 4.9 inches (12.4 cm)
Hydromax X30 (M)
Hydromax X30 Xtreme (M)
Hydromax X30 Wide Boy (L)8.5 inches (21.6 cm)7.9 inches (20.1 cm)Up to 7.0 inches (17.8 cm)Up to 6.1 inches (15.5 cm)
Hydromax X40 (L)10.0 inches (25.4 cm)7.9 inches (20.1 cm)Up to 8.4 inches (21.3 cm)Up to 6.1 inches (15.5 cm)
Hydromax X40 Xtreme (L)
Goliath (XL)10.5 inches (26.7 cm)9.0 inches (22.9 cm)9.2 inches (23.3 cm)7.4 inches (18.8 cm)
Hydromax X50 Xtreme (XL)

This official sizing guide above used more conservative measurements.

The manufacturer’s maximum growth specifications indicated here is the maximum penis size that will fully fit the tube. The manufacturer came up with these numbers by subtracting roughly 1-1.5 inches from the pump’s internal dimension to compensate for suction-seal action. If your size already reached the upper limits of a particular pump, it is a sign that you have outgrown it, and that you need to move to the next model.

The recommendations columns will correlate your current penis dimensions with a suitable pump. To arrive at these recommended sizes, we subtracted around 1 to 2 inches from the pump’s maximum growth specs to compensate penis growth.

Those dimensions are based on pumps purchased from the official Bathmate manufacturer’s website.

The guide below is slightly more updated to include the X20 and the X30 Wide Boy. Its measurements are closer to our tests and recommendations:


Buying a pump that is too Large or too Small

Do not just buy the biggest pump as it is not a wise choice.

  • If you buy a pump that is too large for your girth, the pump won’t plug quickly and it will suck up your scrotum and will give you sore balls.
  • If you buy a pump that is too small for your girth, you will feel some discomfort as your penis’ head will rub on the inner sides of the tube.
  • If you buy a pump that is too large for your length, it should not cause problems as long as the pump’s girth closely fits your base girth to get a nice plug.
  • If you buy a pump that is too small for your length, you will be wasting your money as you won’t have ample room to grow.

Upgrading to a Bigger Pump

For your penis to reach the maximum growth allowed by the pump, it will take more than two years of constant penile workout with proper routines and jelqing exercises.

Girth growth is more limited than length growth — once you gained 1-1.5 inches of additional girth, expansion in this area becomes harder. If your penis has reached the maximum girth but still has 1-2 inches allowance for length, it’s not urgent to change pump if you want to focus solely on gaining a longer penis.

If you reached either the maximum girth or the maximum length (or both), it is time then to move on to the next model if you want to grow simultaneously in both aspects. Refer to the table again to confirm if you have exceeded the maximum growth specs or if one of our recommendations matches your new dimensions.


You’ll be using your pump for a quite a while so use the sizing chart and other information provided here to choose wisely the most fitting model.

Video Explanation

This video is from the official manufacturer and does not contain nudity (despite the thumbnail).

Updated: April 23, 2018 — 1:05 am

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