Let me tell you about this bra size calculator—I actually built it for my wife. Here’s why: She was always complaining about how hard it was to get the sizing right when buying bras. Either the band would be too loose and ride up, or the cups would be off by just a bit, and after trying on a dozen, she’d still walk away unsure. “It’s just a few measurements,” she’d say. “Why isn’t there a straightforward way to calculate it?” That stuck with me. So I spent weekends digging into sizing charts, testing different measurement methods with her, and even roping in her friends to help (shoutout to them, by the way). The whole focus? Making sizing precise, not guesswork. At its core, this tool does one thing: calculate your size accurately by breaking it down into two key numbers. It walks you through measuring your underbust (for the band size) and your bust (to determine the cup size) with clear steps—like keeping the tape snug but not tight for the band, measuring the fullest part of the bust, and even how to read the numbers correctly. The first time my wife used it, it gave her a size she’d never tried before. She bought a bra in that size, and said, “Turns out it’s not that I can’t find a good bra—it’s that my size was wrong all along.” I’m sharing it because so much of bra discomfort starts with bad sizing, not the style. This tool skips the fluff; it just gets the numbers right. If you try it and find any step confusing, let me know—I’ll tweak it. Hoping it saves more people from all that trial and error. ✨

Bra Size Calculator

Find your perfect size

Find your perfect size