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Choosing the right pump size is the most important step for getting results.
Too small? You limit your gains.
Too big? You lose pressure and effectiveness.
Use this guide to find your perfect fit in under a minute.
Measure your erect length from base to tip using a ruler.
Then match your size below:
5–6 inches → Hydromax 5
6–7 inches → Hydromax 7
7–8 inches → Hydromax 9
8–9 inches → Hydromax 11
⭐ Most Popular Choice
The Hydromax 7 is the go-to option for most users. Designed for average sizing, it delivers strong, consistent pressure while staying comfortable and easy to use.
✔️ Ideal for 6–7 inches
✔️ Great for beginners & regular users
✔️ Balanced pressure for steady results
If you're unsure where to start, this is the safest and most popular pick.
🔥 Best for Bigger Gains
The Hydromax 9 is built for users looking to maximize expansion. With a larger chamber, it allows for deeper pressure and more noticeable results over time.
✔️ Ideal for 7–8 inches
✔️ More room for expansion
✔️ Stronger performance for advanced users
Perfect if you're ready to level up from a standard pump.
🚀 Maximum Power & Performance
The Hydromax Xtreme is designed for experienced users who want the most intense pressure and fastest results possible.
✔️ Advanced pressure system
✔️ Faster expansion potential
✔️ Built for serious users
Not recommended for beginners — this is for those who want maximum performance.
Please use our formula to calculate the size of Bathmate Pump that is right for you.
| Current Erect Length | Current Erect Cirumference | |
|---|---|---|
| Hydro 7. | 5.6 - 7.2 in | up to 6.5 in |
| Hydromax 3 for a penis that less than 3 in. | 1 - 3.5 in | up to 6 in |
| Hydromax 5 for a penis that is 3-5 in. | 3.6 - 5.5 in | up to 6 in |
| Hydromax 7 / HydroXtreme 7 | 5.6 -7.2 in | up to 6.5 in |
| Hydromax 7 Wide Boy / HydroXtreme 7 Wide Boy | 5.6 - 7.2 in | up to 7.5 in |
| Hydromax 8 | 7.3 - 8.4 in | up to 7 in |
| Hydromax 9 / HydroXtreme 9 | 8.5 - 9.4 in | up to 7.5 in |
| HydroXtreme 11 for a penis that is 9-11 in. | 9.5-11.5 in | up to 8.5 in |
Start with the Most Popular Size
You can still use it, but correct sizing gives best results.
Yes, Hydromax is beginner-friendly.
Most users notice changes within weeks.
Yes, all Bathmate pumps use water for pressure.
By clicking here you confirm that you are currently erect.