How to Measure Flange Size + Free Printable Ruler
When it comes to finding the right flange for your breast pump, there's more than meets the eye. In this article, you will learn about how to measure flange size, different methods for doing so, and how to find the perfect flange fit.
There are a lot of different steps to consider when you are trying to find the right-sized flange for your breast pump.
Having the right-sized flange can make a huge difference in your pumping journey.
Your nipple measurement can be the first step but knowing how to do that can be tricky.
In this article, I'll share a flange sizing guide, flange chart, and tips for getting the right fit. Flange sizing does matter and is impactful on your pumping journey.
How to Measure Nipple for Flange:
It's MORE than just your nipple size!
Finding the right size flange is more than just taking a measurement. You have to take into account anatomy, elasticity, and the type of flange being used.
Some lactation consultants don't even recommend measuring. I personally find it helpful to, at least, get a ball park range.
If you ask 100 lactation consultants, you'll get 100 different ways to find the right flange size.
Here are MY basic steps for getting the best measurement:
Decide on a method for measuring (discussed here)
Measure BEFORE you pump. You can also measure after you pump to see if there's a huge difference, which may indicate more elasticity.
Your nipple should be erect - if it is not, try and stimulate it so you can get an accurate size
Measure the TIP of the nipple from one side to the other. Place your nipple on your measuring tool like it's on the table - you want it to be underneath your nipple. Traditionally people do the base, but it's the tip that truly matters.
Carefully look at the measurement and make sure you are measuring in mm.
Measure both nipples - they might be different!
Record the measurement
Select a flange size from the chart below - I would also pick a size below and above that if possible
If you don't have flanges available in the right size, you can purchase off-brand flanges and flange inserts on Amazon. I would purchase a couple of different sizes if you can.
Pump again and see how it goes. All these questions should be answered affirmatively to know that you have the right size flange (keep in mind it may take a few pumping sessions to resolve all issues, especially if there is nipple damage).
Do you experience strong sprays of milk?
Are you comfortable?
Does your nipple slide in and out of the tube easily, move freely, and doesn't get sucked to the end (if it does, you may be dealing with elastic nipple tissue)
Do you "empty" the breast in about 20 minutes or less?
If you're struggling to do this on your own, be sure to consider booking a pumping consult! You may be able to get six free visits through The Lactation Network.
Flange Size Chart
While I used to recommend adding 3-4mm to your measurement, I actually now recommend almost your exact niple diameter. Ideally, you'll try a flange size above, below and your actual nipple measurement. However, there is debate on this in the lactation community. Here is a flange size chart that is in the middle of that and adds 2-3 mm to give you a starting point of what breast shield you should use.
FLANGE SIZE
10mm
10-12mm
11-13mm
12-14mm
13-15mm
14-16mm
15-17mm
16-18mm
17-19mm
18-20mm
19-21mm
20-22mm
21-23mm
22-24mm
23-25mm
24-26mm
25-27mm
26-28mm
27-29mm
28-30mm
29-30mm
30-32mm
NIPPLE MEASUREMENT
>10mm
10mm
11mm
12mm
13mm
14mm
15mm
16mm
17mm
18mm
19mm
20mm
21mm
22mm
23mm
24mm
25mm
26mm
27mm
28mm
29mm
30mm
The best fit is a comfortable flange, allows you to have strong and frequent sprays, and yields the most milk possible for you. You can find places that sell smaller flange sizes here.
Free Printable Flange Size Ruler
I have two different printable options for you!
The first is a printable paper caliper that my husband designed. I find it better than just a regular ruler since you can adjust it to fit your nipple. This is ideal for getting an accurate tip measurement.
The second is a circle-style measurement tool. You have to cut out the holes, but it generally works pretty well. However, if your nipple tip is substantially smaller than the base, this may throw you off.
You can enter your email below to get a copy of both sent straight to your email, along with details on how to use it.
Methods for Measuring Nipple Flange Size
Circular Diameter Ruler
One measure your flange size is with a circular ruler. I really like using these! There are some companies that have made some specially branded ones for breastfeeding, but honestly, you can grab a three-pack on Amazon or even at your local hardware shop.
What I like about these is that you can put your nipple inside the circle. You want your nipple to be snug but not stuck or rubbing. You can also use the traditional ruler on it to double-check. You should double check the tip measurement though. As I previously mentioned, if the base of your nipple is much larger than the tip, this may be inaccurate.
Traditional Ruler:
You can also use a traditional ruler to measure your flange size. Keep in mind that since this will likely be in cm, you will need to convert to mm.
Measuring Tape:
A measuring tape can also be used to measure your nipples. The one caveat I will add is that sometimes measuring tapes stretch out, so they aren't always as accurate.
Digital Caliper:
The most precise way to measure your flange size is with a digital caliper. This tool measures the dimensions of an object in millimeters or inches. If you have a digital caliper, you can use it to measure the diameter of your nipples tip very accurately. I wouldn't go out and buy one of these (unless you really want to), but if you have one lying around, it can be really helpful!
FAQs about Flange Sizing
Should I measure my flange before my baby arrives?
If you are planning to pump soon after birth, this would be a good idea so you can have a baseline. Keep in mind that many mothers see their nipple size change after the baby is here.
Can my flange size change?
Yes, it can. If you notice an increase in pain, efficiency, or time spent pumping, you may want to measure again.
Should I measure before or after I pump?
There is debate on this. I personally do it before, but you can try both and see if there's a huge change in the nipple size.
My pump only has two flange sizes - what should I do?
Many off-brand flanges are available that may be compatible with your pump, and these can often be found on Amazon. Flange inserts can also be a good option.
We hope that this article has helped you determine your flange size and find the right-sized flange for your breast pump. If you have any questions, please don't hesitate to contact us!
