Bra Size Calculator
Calculate your accurate bra band and cup size based on bust and underbust measurements.
Input Parameters
Enter details for calculation.
Calculated Bra Size
Expert Tip
Bust measurements should be taken while wearing a non-padded bra, holding the tape snugly but not tight.
Calculation Methodology & Details
Formula
Computes band size, then maps difference (1 in = A, 2 in = B, 3 in = C) to cups.
Important Disclaimer
The calculations provided are for educational and general informational purposes only. They do not replace professional advice or diagnostic validation. Always consult a qualified specialist.
How Bra Sizes are Calculated
Follow these steps to complete the calculation:
Measure Underbust
Measure around the ribcage directly under the bust.
Measure Bust
Measure around the fullest part of the bust.
Related Tools
Detailed Insights & Expert Guide
ℹ️ About this Calculation
Finding the perfect bra fit is essential for comfort, support, and health. Bra sizing consists of two measurements: the band size (e.g., 34, 36) and the cup size (e.g., A, B, C, D). This calculator determines your correct bra size using the standard underbust and bust measurements.
Variable Glossary
Underbust Measurement
The circumference of your ribcage directly under your bust, measured in inches or cm.
Bust Measurement
The circumference of the fullest part of your breasts, measured in inches or cm.
How to Calculate Step-by-Step
Step 1
Measure around your ribcage directly under your bust. Keep the tape firm and level.
Step 2
Round the underbust measurement to the nearest even number to find your band size.
Step 3
Measure loosely around the fullest part of your chest to get your bust size.
Step 4
Subtract the band size from the bust measurement. The difference in inches determines the cup size (e.g., 1 inch = A, 2 inches = B).