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Use the Official Belly Bandit® Calculator

You're at weeks, and your belly is inches, so we recommend .

To ensure the most accurate sizing, we do not advise sizing earlier than the 8th month. Please note the sizing calculator is not an exact science and all measurements must be given correctly to receive the closest sizing recommendation.

The above calculator will be your absolute best bet for correct sizing. If for some reason you cannot view it, please read on to manually size yourself! Correct sizing is essential for comfort and product effectiveness. Buying a Belly Wrap that is too large will not wear well under clothing and may affect end results.

How your Belly Wrap should fit

When you try on your Belly Wrap for the first time the ends should barely be touching. That's right, if you can pull the Velcro closed it is too big! If the ends of the band are 1-2 inches shy of closing DO NOT EXCHANGE for a larger size. Simply lay down on a flat surface with the band beneath you and try closing it or get a little help from your partner! If you find the band to be extremely tight you can wear it for a few hours each day until you begin to shrink in to the size. You’ll soon be wearing it around the clock!

Belly Wrap Sizing

Band Size Fits Belly Size
X-Small 28"-32" (71cm-81cm)
Small 33"-37" (84cm-94cm)
Medium 38"-43" (97cm-110cm)
Large 44"-49" (112cm-124cm)
X-Large 50"-57" (127-144cm)


It is quite common for our customers to purchase a belly wrap while they are still pregnant. The following chart give a good prediction of your likely size immediately post-pregnant.

There is no exact science that fits all women, but don't fret, here are some tips we have found to be helpful if you are not using the above sizing calculator... If you are purchasing a Belly Wrap early on in your pregnancy, your best bet is to go up 1 to 2 band sizes from your pre-pregnancy belly size.

In the eighth month many women will be the same size as they will be post delivery. Simply measure the part of your tummy that is the biggest all the way around your abdomen, which is usually at the belly button, and choose the corresponding band for your size. Just prior to delivery simply subtract 3 to 5 inches from your belly measurement. Select the corresponding band for that size. If you purchase your Belly Wrap after you give birth, simply choose the corresponding band for belly size. The Belly Wraps are designed with five inches of adjustability to stay tight as you shrink.

Measurements reflect upon belly, NOT pant's sizes

Which Belly Wrap is right for you?


Sizing for Upsie Belly

Measure across the largest part of your belly, usually this is across your belly button. Use the following guide to determine the size of Upsie Belly you should get to last you through the rest of your pregnancy.

 Band Sizes Belly Size (Week 10-24) Belly Size (Week 25-42)


79-97 cm


79-89 cm





91-109 cm



119-147 cm


112-140 cm




56"+ (142cm+)


Sizing for Clothes Items

Sizes below are provided as a rough guide. For maternity clothing, please take into consideration that the bump size may vary.


Sizing for Bras

The following table gives guidance on choosing the bra size based on your normal bra band and cup sizes.


Download our free printable ruler here!