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Perky Lady Bra Size Calculator

Bra Size Calculator

Discover your ideal Perky Lady bra size with our quick and easy bra calculator quiz, backed by years of expert fitting experience from thousands of Perky Ladies.

All you need is a soft measuring tape, less than 5 minutes, and a little privacy to get started.
You'll be measuring without a bra on

Step 1 - Underbust

Wrap the tape measure quiet snug (think grandma's firm hug, not torture) right under your breast, keeping it parallel to the floor.
Enter to the nearest half inch below

Underbust Measurement

Step 2 - Standing Bust

Stand or sit up straight (if you're unable to stand). Wrap the tape measure around the fullest part of your bust. Keep the tape taught (not digging into your skin) and parallel to the floor.
Enter to the nearest half inch below

Standing Measurement

Step 3 - Leaning Bust

Bend at the wasit until you are at a 90 degree angle while allowing your breasts to hang freely towards the ground. If you cannot stand, bend to your comfort level. Wrap the tape measure around the fullest part of your bust. Ensure the tape is straight and taught but not digging in. Enter to the nearest half inch below

Leaning Measurement

Step 4 - Breast Shape

Select the shape that most closely matches your breasts from the list below

Hint: Bend at the waist and check your nipple positioning to help

Breast Shapes

Step 5 - Breast Consistency

Select the Consistency that most closely matches your breasts from the list below

Step 6 - Skin Elasticity

Select the skin elasticity of your breasts that most closely matches from the list below

Before you get your results...

This size is a starting point

Tape measure sizing gets trickier for D+ cups, petite, and plus size bodies.


It's not all magic: a variety of breast characteristics, body type, unique features of your rib case, injuries, surgeries, and many more factors can all influence your size.


Get close, Then refine.


Calculators can't account for everything. That's where shopping with our fitting experts makes the difference


NOW... Let's calculate your size!

Your Results

Step 7 - Determine Your Band Size

Round your snug underbust measurement to the nearest even number. This is your band size.

Example: If snug underbust = 31.25", band size = 32.

Step 8 - Determine Your Initial Cup Size

Calculate your initial cup size based on your measurements. Follow the instructions provided for different cases.