How to measure your bra size

Example:

Determine band size:

37" bust size

34" band size

Calculate Cup Size:

37" bust size

- 30" rib cage size

7" difference

D cup size

Determine bra size:

34D

Fit fundamentals

Make sure the bottom band is snug and lies flat across your back — not riding up or loose around your rib cage.

The cups should fit smoothly — spilling out the sides or front means the cup size is too small, while extra space means the cups are too big.

Straps should lie smoothly against your skin, without sliding around or digging uncomfortably into your skin.

FOR ALL YOU DIY LOVERS

GET EVERYTHING YOU NEED
You’ll need a flexible tape measure. It’s also best to wear a bra that doesn’t change your shape — no padding or compression. You can also just skip the bra.

FIGURE OUT YOUR BAND SIZE
Measure around your rib cage where the bottom band would sit. The tape measure should feel quite snug. If you get a fraction, round down to the nearest inch. Using , find your corresponding band size based on your measurement.

FIGURE OUT YOUR CUP SIZE
Measure around the fullest part of your boobs — which may not be the center — and round up to the nearest inch. Then subtract your rib cage measurement. The difference in inches is your suggested cup size. If you get a fraction, round up to the larger size.