Choosing the correct Bathmate size is one of the most important steps for getting the best results from a water-based penis pump.
A properly sized pump creates a stronger seal, better pressure control, and a more comfortable experience. Whether you’re new or upgrading, this guide will help you match your measurements to the right Bathmate model.
Use your fully erect measurements to compare against the size chart below.
If you are between sizes, the smaller option usually provides better control and a stronger seal.

All current Bathmate size options and measurement ranges can be viewed on the main collection page. Below you will find a quick reference table on size.
| Bathmate Model | Max Length | Max Girth |
|---|---|---|
| Bathmate Hydro 3 | ~1-3" | 6 inches |
| Bathmate Hydromax 5 | ~3–5" | 6 inches |
| Bathmate Hydromax 6 | ~4-6" | 6.5 inches |
| Bathmate Hydromax 7 | ~5–7" | 6.5 inches |
| Bathmate Hydromax 7 - Wideboy | ~5–7" | 7.5 inches |
| Bathmate Hydromax 8 | ~6-8" | 7 inches |
| Bathmate Hydromax 9 | ~7–9" | 7.5 inches |
| HydroXtreme 11 | ~9–11" | 8.5 inches |
Each Bathmate model is designed for a specific size range and experience level.
👉 View Hydromax models
👉 View HydroXtreme models
A proper fit will always outperform a larger, poorly fitted pump.
Browse all Bathmate water-based penis pumps and choose the model that matches your size and goals.