A step-by-step guide to finding the right penis pump cylinder size
How to Measure Up for a Penis Pump: What Size Cylinder Do I Need?
Your guide to finding the perfect fit—because one size definitely doesn't fit all.
Why Size Matters
Choosing the right penis pump cylinder size is critical for both comfort and results. Too small, and you're limiting growth. Too large, and you may not get a good seal—or worse, you could risk injury. Let’s help you size up like a pro.
What You’ll Need
- A flexible measuring tape or a piece of string and ruler
- A mirror (optional, but helpful)
- Your fully erect penis (yes, it matters!)
Step 1: Measure Your Girth
Wrap the tape around the thickest part of your erect shaft—usually mid-shaft. Note the circumference in inches or millimetres. This is your girth measurement.
Pro tip: If using string, mark where it meets, then measure the string against a ruler.
Step 2: Measure Your Length
Measure from the base of your shaft (where it meets your body) to the tip of the penis. This is your erect length.
This helps ensure your cylinder isn’t too short—and avoids awkward "head pressing against the top" moments.
Step 3: Match Your Measurements to a Cylinder
Cylinders are usually sized by internal diameter and length. Use your girth to calculate your ideal diameter:
- Girth ÷ 3.14 = Diameter
Then round up slightly for a comfortable fit. Here’s a rough guide:
| Girth | Recommended Cylinder Diameter |
|---|---|
| Under 4.25" (10.8cm) | 1.5" (3.8cm) |
| 4.25" – 4.75" (10.8–12cm) | 1.75" (4.4cm) |
| 4.75" – 5.25" (12–13.3cm) | 2" (5cm) |
| 5.25" – 5.75" (13.3–14.6cm) | 2.25" (5.7cm) |
| 5.75"+ (14.6cm+) | 2.5" (6.3cm) or larger |
Still Not Sure?
If you're between sizes or new to pumping, go slightly larger to ensure comfort. Many premium brands like LA Pump allow custom sizing, so it’s worth measuring carefully and choosing accordingly.
Pro Tips for a Better Pumping Experience
- Always use a water-based lube to create a better seal.
- Trim hair around the base if it interferes with suction.
- Start slow. Don’t rush pressure or time—your body will thank you.