Lost or Gained Weight?
Here's What Changes.
Weight change doesn't shift your bra size evenly it affects the band and cup differently. Enter your current size and roughly how much weight you've lost or gained to get an estimated new size to try.
- ✓ Results in under a minute, no sign-up needed
- ✓ Works with pounds (lb) or kilograms (kg)
- ✓ Based on common fitter-observed patterns
Estimate your new size
Enter your current size and weight change.
How Weight Change Affects Bra Size
Fitters commonly observe that roughly every 10–12 lb (4.5–5.5 kg) of weight change shifts cup size by about one letter, while band size tends to shift more slowly roughly one band size per 15–20 lb (7–9 kg). This is an approximation, not a formula body composition, where you carry weight, and genetics all affect how much (if any) of a weight change shows up in your chest specifically.
Frequently Asked Questions
Does everyone's bust change with weight?
No some people's chest size stays relatively stable through weight changes, while others see a noticeable shift. Genetics and body composition play a big role.
Should I buy new bras right after losing weight?
It's worth waiting a few weeks for weight to stabilise, since sizing can keep shifting during active loss or gain.
Is this estimate exact?
No it's a starting point based on common patterns. Always confirm with a measurement or a fitting once you're in the new range.