Try the Calculator
Core Calculators
Bra Size Calculator Cup Size Calculator Bust Size Calculator Band Size Calculator
Conversion Tools
Bra Size Conversion Sister Size Calculator Brand Size Converter
Specialty Calculators
ABTF Calculator Sports Bra Calculator Plus Size Bra Calculator Maternity & Nursing
Guides
How to Measure at Home Bra Size Chart Guide Sister Sizing Explained How to Measure for a Sports Bra Signs Your Bra Doesn't Fit
Bra Measurement Chart About

About IMRango

IMRango is a free, independent measurement resource dedicated to helping you find the perfect bra fit – without the guesswork, without the pressure, and without sharing your data.

We believe that every body deserves a comfortable, confident fit. Whether you’re shopping for your first bra, looking for a sports bra, navigating maternity sizing, or seeking a more accurate size through the ABTF method, our calculators are here to support you.

What We Offer

  • ✅ 14 free calculators – from standard band/cup to ABTF, sister sizing, brand conversion, plus size, maternity, and more.
  • ✅ US, UK, EU, AU, and FR sizing – compare international sizes instantly.
  • ✅ Privacy-first – all calculations run in your browser. We never store or share your measurements.
  • ✅ Regularly updated – our sizing data and guides are reviewed to stay accurate.
  • ✅ Inclusive sizing – tools for men, transgender women, non-binary individuals, and all body types.

Why Trust IMRango?

Every calculator on this site runs on a clearly disclosed method – the standard band-and-bust formula, the community ABTF three-measurement approach, or direct sister-size logic. You always know what’s behind your result, not just a number.

Our sizing data and guides are reviewed on a regular schedule, with a visible last-updated date on every page. Results here are estimates meant to make shopping easier – not a substitute for a professional fitting.

We are an independent resource. We don’t sell bras, take commissions, or promote specific brands. Our only goal is to give you accurate information.

Meet the Author

Sarees Ali is the founder of IMRango. With a background in data analysis and a passion for body-positive design, Sarees created IMRango to make bra sizing simple, accessible, and private for everyone.

“I’ve seen too many people struggle with uncomfortable bras because they didn’t have accurate sizing information. I built IMRango to change that – one measurement at a time.”

Contact

Have feedback, questions, or suggestions? We’d love to hear from you.

📧 Email: info@iamrango.com