Size Calculator

Use this calculator to determine your correct pump cylinder width.

Room for 10 to 15% expansion is recommended. Do not exceed over 30% of your current size.

General consensus is to measure your thickest point.

For men with wide bases who would like to focus higher on the shaft, measure your mid-shaft instead, while ensuring your base will still fit. And if you are relatively more oval-shaped or flat, go up a size to make sure it fits.