Measuring without a bra is common: you might not own one that fits, or you’re measuring after a change like pregnancy, weight loss or a new stage of life. It works well, with one extra step.
Why “without a bra” changes the bust measurement
A bra lifts and gathers breast tissue forward. Without it, softer tissue settles lower and spreads to the sides. A tape held level around the chest can then pass above some of the tissue and read small. That gives too small a cup.
The band is not affected. It is measured around the ribcage, under the breasts, either way.
The three measurements
1. Snug underbust (standing). Wrap the tape snugly around the ribcage, just under the breasts, level all round. This sets the band.
2. Standing bust. Stand upright and wrap the tape loosely around the fullest part. Don’t lift the breasts with your hand.
3. Leaning bust. Bend forward at the waist until your upper body is roughly flat (90 degrees), with arms relaxed. Wrap the tape loosely around the fullest part as the breasts hang. A mirror or a second person helps keep it level.
Some fitters also take a lying-down measurement, on your back, to see how tissue spreads across the chest. It is mostly used together with the other two.
Which number to use
- Standing and leaning are close (within about 1 inch): use either. Your size is clear.
- Leaning is 1 to 2.5 inches bigger: use the leaning number for the cup. That is the volume a bra has to hold.
- Leaning is more than about 2.5 inches (6 cm) bigger: the leaning number can read high for very soft tissue. Try the cup the leaning number gives, and one cup smaller, and keep the one that passes the fit check.
The bra size calculator has an optional leaning measurement. When you add it, it uses the larger of the standing and leaning bust.
Bras for soft, settled or lower-set breasts
- A firm band does the lifting. If it rides up, nothing above it can lift. Go down a band and up a cup (the sister size).
- Full-cup and balconette shapes lift from below and hold tissue in the cup. Plunge styles may leave tissue outside the wire.
- Seamed cups shape soft tissue better than stiff molded cups, which can gape at the top.
- Lean in and scoop after putting the bra on: lean forward and gently move tissue from the sides into the cups. It often fills a cup that looked too big.
If you have no tape either
Use a ribbon and a ruler. The measuring-without-a-tape guide shows how.
Sources & method: sizing rules follow the standard band-and-cup system used by UK, US, AU and EU brands, checked against fitting guides from specialist retailers and fitting communities. How we work.