Mandy Stans / Bra Fit
Free sizing tool
Bra fit starts here

Find your starting size.
Then find your fit.

Calculate a starting size, evaluate the fit of a bra you already own, then compare researched models. Every product suggestion includes its evidence and limitations.

01 Measure & size02   Fit assessment03   Model matches

Your measurements

Use a soft measuring tape, without a bra.

01

Measure around your ribcage

in
Tape rests lightly on skin.
in
As firm as a supportive band.
in
Exhale, then pull the tape firmly.
02

Measure around your bust

in
Upright, around the fullest area.
in
Lean forward about 90°.
in
Lie flat on your back.
Measuring tip: Keep the tape level and avoid compressing your bust. Your underbust should normally read loose ≥ snug ≥ tight. If one looks unusual, measure again.
Preview tip: To explore the site quickly, click Try example in Stage 1 or Load benchmark test in Stage 2. Both use demonstration information rather than your own measurements.

No account needed. Measurements stay on this device while the page is open.

02 / Real-world fit

How does your current bra fit?

A bra that stays comfortable and fits correctly is more useful evidence than a shape label alone. Use an existing bra for these questions, ideally one you have worn for a full day.

From Stage 1 or a known well-fitting bra. UK sizing only.

This never triggers an automatic cup-size increase.

What happens next

Size is the starting point. Shape changes everything.

01 / Get the band right

Test the band with the cups hanging down your back and fasten on the loosest hook. It should feel secure without pain.

02 / Check cup fit

Place all breast tissue inside the cups. Spillage, empty space or wires sitting too low can signal a size or shape mismatch.

03 / Match the construction

Our current model library contains 44 researched bras. A verified combination of band and cup is required before a model becomes a recommendation.