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What size penis pump do I need?

As a general rule of thumb, a proper size penis pump is 2 to 3 inches longer than you penis is erect.  As an example, if you have a penis that is 6 inches, you should be using an 8 to 9 inch penis pump cylinder.

You should have at minimum a 1/4 inch of space around the sides of your penis.

Penis pump Calculator

To use our penis pump calculator, simply put in your penis measurements and click 'view suggested pump size'.

What size penis pump do I need?
Recommended pumps are based of the below input. View our measuring guide
Recommended pump size
**Please note that this is a suggestion only.  We cannot guarantee fit due to the shape and personal touch of each individual penis and measuring style.**

What penis measurements will you be taking?

You will be taking the following measurements when measuring for a pump.

Penis length  Measure from your pubic bone to the tip of your penis
Penis Circumference Measure around the base of your penis

How do I measure my penis for a penis pump?

Measuring the length of your erect penis

  1. Place a tape measure or ruler along the top side of your erect penis. If you cannot get hard, then measure your flaccid penis.
  2. Press the measuring device flat against your pelvis where it meets your shaft
  3. Take note of the length on the measuring device right where your tip ends.
  4. This is your penis length

Measuring the girth of your erection

  1. Find the thickest part of your penis (it is different for everybody) and wrap a piece of string loosely around this area. For some, this will be by the head or tip and for others, it may be closer to the base.
  2. Take a marker and mark where the string crosses itself.
  3. Lay the string next to a ruler to find the exact circumference. 
  4. Find the measurement most closely corresponding to your penis circumference in the table below – your ideal starting cylinder size will be in the corresponding column to the right.

If you have a measuring tape that can be wrapped around your penis, this is an alternative to using the string method above.

(Cylinder Order Size is the tube’s inside diameter.)
Thank you to Chris from LA Pump for this great video on measuring your penis for a penis pump.



If your circumference is under 4 3/4 inches we recommend you start with a 1 1/2″ cylinder.

Diameter to circumference conversion chart

penis pump size chart conversion chart

Pump Cylinder Size Conversion Chart

Your (Erect) Penis Circumference Recommended Cylinder Diameter
4 3/4 Inches (12 cm) or Less 1 1/2 Inches (3.8 cm)
5 1/2 Inches (13.97 cm) 1 3/4 Inches  (4.4 cm)
6 1/4 Inches (15.87 cm) 2 Inches (5.0 cm)
7 Inches (17.78 cm) 2 1/4 Inches (5.7 cm)
7 7/8 Inches (19.5 cm) 2 1/2 Inches (6.3 cm)
8 5/8 Inches (21.90 cm) 2 3/4 Inches (6.9 cm)
9 3/4 Inches (24.76 cm) 3 Inches (7.62 cm)
10 1/4 Inches (26.03 cm) 3 1/4 Inches (8.2 cm)
11 3/4 Inches (29.85 cm) 3 3/4 Inches (9.5 cm)
13 3/8 Inches (33.97 cm) 4 Inches (10.1 cm)
14 1/4 Inches (36.19 cm) 4 1/2 Inches (11.4 cm)
15 3/4 Inches (40 cm) 5 Inches (12.7 cm)

    What if my pump is the wrong size?

    If you have been pumping with the incorrect penis pump, you will be happy to know that there are few risks and even less risks that are serious in nature.

    Risks if your penis pump is too small

    • You might not fit at all
    • You can limit the amount of growth you will see
    • You can irritate your skin by rubbing on the cylinder walls
    • You might experience slight bruising

    Risks if your penis pump is too large

    • You can risk apply too much air pressure to your penis
    • Can cause temporarily tissue damage
    • You might see discoloration to your penis
    • You might experience sore skin or bruising to your penis 
    None of these issues too serious and typically, the negative effects go away by themselves over time. 
    Though the symptoms are usually not serious and will pass, the idea behind pumping is to provide a pleasurable experience.
    penis pump styles

      Final Thoughts for getting the perfect size penis pump

      Measure twice and buy once!  Getting a correct fitted pump can be the difference between seeing and results and not.  If you have any questions, please contact our support team and we will help you get the correct pump.

      Our Commitment to Quality Information

      Navigating the information landscape, our blog prioritizes human touch and accuracy. We use these elements as our compass:

      • Content for humans, by humans
      • Research and fact-checking
      • Reference to reputable sources
      • Collaboration with Experts

      Learn more about our selection process

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