Bra Size Calculator

Step 1

How to Measure

Underbust Measurement

Measure around your ribcage, just under your bust. The tape should be snug but not tight.

Overbust Measurement

Measure around the fullest part of your bust. Keep the tape level and comfortable, not tight.

Step 2

Calculate Your Size

Measurement Unit

Inches Centimeters

Underbust Measurement

Overbust Measurement

Select Your Region

Size Guide

Understanding Your Size

Understanding your measurements is key to finding the perfect fit. Use this guide to determine your cup size based on the difference between your underbust and overbust measurements.

Cup Size	Difference (Inches)	Difference (CM)
AA	Less than 1"	Less than 2.5cm
A	1"	2.5cm
B	2"	5cm
C	3"	7.5cm
D	4"	10cm
DD/E	5"	12.5cm

Fitting Guide

Tips for the Perfect Fit

Band Fit

The band should be snug but not tight. It should stay level around your body and not ride up in the back. You should be able to fit two fingers under the band comfortably.

Cup Fit

The cups should fully contain your breast tissue without any spillage or gaping at the top. The underwire should sit flat against your ribcage and follow your natural curve.

Center Gore

The center piece between the cups should lie flat against your sternum. If it's floating or not touching your skin, you may need a different size or style.

Straps

Straps should be comfortable and not dig into your shoulders or slip off. They should provide support without carrying the full weight of your breasts.

Frequently Asked Questions

How does the BMI Calculator work?

Our BMI Calculator computes your Body Mass Index by dividing your weight (in kilograms) by the square of your height (in meters). You input your weight and height, and it instantly calculates your BMI value based on this standard formula.

What does my BMI result mean?

Your BMI result indicates your body mass category: underweight (below 18.5), normal weight (18.5–24.9), overweight (25–29.9), or obese (30 and above). It’s a general indicator of health based on weight relative to height.

Can I use pounds and feet instead of kilograms and meters?

Yes, our BMI Calculator supports both metric (kilograms, meters) and imperial (pounds, feet/inches) units. Enter your measurements in either system, and it will automatically convert them to calculate your BMI accurately.

Is BMI the same for all ages and genders?

No, while our BMI Calculator uses the standard formula for adults, BMI interpretation differs for children and teens, where age and gender-specific percentiles are used. For adults, the categories are the same regardless of gender.

How accurate is the BMI Calculator?

The BMI Calculator is mathematically accurate based on the inputs you provide. However, BMI is a general screening tool and doesn’t account for muscle mass, bone density, or other factors—consult a healthcare professional for a full assessment.

BMI Calculator

Calculate your Body Mass Index to understand your healthy weight range.

Waist-to-Hip Ratio

Calculate your waist-to-hip ratio to assess body fat distribution.

Body Fat Calculator

Estimate your body fat percentage using various measurement methods.

How to Measure

Underbust Measurement

Overbust Measurement

Calculate Your Size

Your Perfect Size

Primary Size

International Conversions

Quick Fit Tips

Understanding Your Size

Tips for the Perfect Fit

Band Fit

Cup Fit

Center Gore

Straps

Frequently Asked Questions

Related Calculators

BMI Calculator

Waist-to-Hip Ratio

Body Fat Calculator