Frequently Asked Questions
Find answers to the most common questions about bra sizing and fitting.
How accurate is your bra size calculator?
Our calculator uses industry-standard measurements and algorithms developed with input from professional bra fitters. While it provides highly accurate results for most women, we always recommend trying on bras before purchasing, as fit can vary between brands and styles.
Should I measure myself with or without a bra?
For the most accurate results, measure yourself while wearing a well-fitting, non-padded bra. This provides the most realistic measurements that translate to proper bra sizing. Avoid sports bras or heavily padded bras during measurement.
Why do I get different sizes from different calculators?
Different calculators may use varying algorithms and measurement methods. Some use the traditional +4 method, while others use more modern fitting techniques. Our calculator uses contemporary fitting methods that many professional fitters prefer for better accuracy.
What if my calculated size feels wrong?
If your calculated size doesn't feel right, try sister sizes (same cup volume with different band sizes). Also consider that different bra styles and brands fit differently. Our brand guide can help you understand how specific brands tend to fit.
How often should I measure myself?
We recommend measuring yourself every 6-12 months, or whenever you experience significant weight changes, pregnancy, or hormonal changes. Your bra size can change due to various factors including age, weight fluctuations, and life events.
What's the difference between US and UK sizing?
US and UK sizing are similar for smaller cup sizes (A-D), but differ significantly for larger cups. UK sizing is generally considered more consistent and accurate for D+ cups. Our converter helps you translate between different international sizing systems.
Can I use this calculator if I'm pregnant or nursing?
Yes, but keep in mind that your size may change frequently during pregnancy and nursing. We recommend measuring more often during these periods and considering nursing-specific bra features for comfort and functionality.
What are sister sizes?
Sister sizes are different band and cup combinations that hold the same cup volume. For example, 34C, 32D, and 36B are sister sizes. If your band feels too tight or loose, try a sister size for better comfort while maintaining the same cup volume.
Why does my bra size vary between brands?
Different brands have varying fit philosophies, construction methods, and target demographics. Some brands run larger or smaller than others. Our brand guide provides specific sizing notes for popular brands to help you find the right fit.
Is it normal for my breasts to be different sizes?
Yes, it's completely normal for breasts to be slightly different sizes. Most women have some asymmetry. When choosing a bra size, fit for your larger breast and use padding or inserts if needed for the smaller side.
How do I know if my bra fits properly?
A properly fitting bra should have: the center gore lying flat against your chest, no spillage over the cups, the band sitting parallel to the floor, and straps that don't dig in or fall off. Check our fitting guide for detailed signs of proper fit.
Can I trust online bra shopping?
Online bra shopping can be successful with the right approach. Know your measurements, read size charts carefully, check return policies, and read reviews from customers with similar body types. Start with one bra to test the fit before ordering multiple items.
Still Have Questions?
Can't find the answer you're looking for? Try our calculator or explore our educational resources.