Penis Pump Cylinder Sizing

For the best results, measurements should be taken when fully erect.

Length: Measure from the base of the penis to the tip.
Girth: You’ll want to find the thickest area and measure around it.

A slightly roomier diameter allows the vacuum to form more evenly, creating a more controlled and comfortable experience.

Penis Pump Cylinder Size Chart

Use our general reference guide for selecting a penis pump tube based on your girth and measurements. Remember, these measurements are based on circumference when fully erect.

How to Use This Table

> Start by measuring the girth of your erected penis

> See the middle row, cylinder circumference. Your measured girth must be smaller than the circumference of the cylinder in order to fit inside.

> We recommend selecting a product with the suggested circumference matching the nearest size larger for the measured girth of your erected penis. For example, if your girth measures 4.5”, the nearest size larger would be 4.7”. That would correspond to a Cylinder ID size of 1.75" (4.4 cm).

Cylinder ID Size	Cylinder Circumference	Suggested Circumference
1.35" (3.4 cm)	4.3" (11 cm)	3.5" (9 cm)
1.50" (3.8 cm)	4.7" (12 cm)	3.9" (10 cm)
1.65" (4.2 cm)	5.1" (13 cm)	4.3" (11 cm)
1.75" (4.4 cm)	5.5" (14 cm)	4.7" (12 cm)
2.00" (5.1 cm)	6.3" (16 cm)	5.5" (14 cm)
2.125" (5.4 cm)	6.7" (17 cm)	5.9" (15 cm)
2.25" (5.7 cm)	7.1" (18 cm)	6.3" (16 cm)
2.50" (6.4 cm)	7.9" (20 cm)	7.1" (18 cm)
2.75" (6.9 cm)	8.7" (22 cm)	7.9" (20 cm)
2.875" (7.4 cm)	9.1" (23 cm)	8.3" (21 cm)
3.00" (7.6 cm)	9.5" (24 cm)	8.7" (22 cm)
3.25" (8.3 cm)	10.2" (26 cm)	9.5" (24 cm)
3.50" (8.9 cm)	11.0" (28 cm)	10.2" (26 cm)
3.70" (9.4 cm)	11.8" (30 cm)	11.0" (28 cm)
4.10" (10.4 cm)	13.0" (33 cm)	12.2" (31 cm)
4.50" (11.4 cm)	14.2" (36 cm)	13.4" (34 cm)

This chart is meant as a starting point. Individual preference and comfort can vary slightly depending on experience level and usage style.

Choosing the Right Penis Pump Tube Length

Length is just as important as diameter when choosing the correct product for penis pump sizing.

A cylinder that is too short could cause problems with extension, while one that is too long could be awkward and get in the way. The goal is to maximize extension without pressing against the end of the tube.

Add a small amount of space beyond your measured erect length. Avoid selecting a tube that feels restrictive at full extension.

Why Proper Sizing Matters

A well-fitted penis pump tube supports:

More consistent vacuum control
Better seal during use
Reduced need for adjustments
A more stable overall experience

If sizing feels off, avoid rapidly increasing vacuum intensity or making frequent adjustments. This could lead to inconsistent results.

Practical Sizing Tips

Start with your measured size first, then make adjustments as needed.
Avoid choosing the smallest/most snug fit
Allow for a little extra room
Double-check measurements for the most accurate results
Don’t ignore discomfort during initial use
Depending on your goals, you may choose 2 sizes larger than the suggested ID. However, selecting a cylinder that is too large can make sealing more difficult

Final Considerations

Penis pump sizing is not about finding a perfect number on the first try. The goal is to find what works for a controlled and repeatable experience.

Using a properly sized system will feel more natural, require less adjustment, and allow you to focus on consistency for maximum growth.