This tool is intentionally conservative. It does not claim to calculate a universal bra size because brands use incompatible sizing systems. Instead, it identifies the most useful next sizing step from the information you already have.
How the assistant makes its recommendation
The logic follows the same sequence used throughout TrainingBras.com: measure → manufacturer chart → fit check → troubleshoot construction/style. It never converts age directly into a bra size and does not treat one brand's Medium as another brand's Medium.
What this version does not do
It does not yet compare live manufacturer size tables or calculate a cross-brand equivalent. Those features belong to the later brand-size database, where every range can be tied to a named manufacturer source and verification date.
After you buy or try on a bra
Always perform the 5-Point Fit Check. A size recommendation is a starting point, not proof that the garment fits.
Example pathways
| Situation | Assistant direction |
|---|---|
| No measurements, first purchase | Measure first; do not guess from age. |
| Measurements + specific product | Use that manufacturer's current chart, then Fit Check. |
| Band rides up | Open the riding-up diagnostic before changing multiple variables. |
| Old bra suddenly feels different | Remeasure and inspect garment wear. |
No measurements are stored by this tool
This first version runs in the browser and does not ask you to enter body measurements at all. It only asks whether you have them, because its job is to choose the next step rather than collect personal data.