Bra Size Calculator

Professional Sizing Tool

Teen Bra Size Guide

Learn how to measure confidently, pick first styles, and protect your privacy while growing into your perfect fit.

Stages of Breast Development

Bodies grow on their own schedule. Understanding the stages helps set expectations and reduces comparison with friends or online photos.

Early budding: the breast area feels tender and small buds appear under the nipple area.
Growth phase: breasts gain volume at different paces—one side may grow faster than the other.
Shape definition: tissue becomes fuller; underbust definition makes wearing a supportive bra helpful.
Stabilisation: changes slow down, but growth and size shifts can continue into early twenties.

Set Up a Comfortable Measurement Space

A calm environment makes the first fitting experience more relaxed. These tips help ensure privacy and accuracy.

Use a soft tape measure; a friend, parent, or trusted adult can help if you feel comfortable.
Wear a non-padded bralette or a thin camisole during measurement for modesty.
Stand tall, relax your shoulders, and keep the tape level around your body.
Write down both measurements so you can compare changes over time.

Review Measurement Guide No Tape Measure?

Styles to Explore First

Bralettes & Crop Tops

Gentle support with stretch fabrics; perfect for early stages or casual comfort.

Sports Bras

Ideal for school activities and PE; look for moisture-wicking fabrics and firm bands.

Lightly Lined Bras

Offer coverage under fitted tops without heavy padding; good for later stages.

Training Bras with Hook & Eye

Introduce adjustability and help practice fastening methods before trying underwire bras.

Confidence & Privacy Tips

Your comfort comes first. These ideas help you stay confident whether shopping in person or online.

It is normal for breasts to grow at different speeds—everyone has their own timeline.
Choose bras based on comfort and how they make you feel, not just trends.
You can politely decline help in fitting rooms if you prefer to try on your own or with a trusted adult.
Online shopping? Read size charts and reviews, and keep tags until you are sure about the fit.

Parent & Guardian Corner

Use the printable conversation guide to support an open, reassuring dialogue. Emphasise that growing bodies are normal, and focus on comfort over appearance.

Download Conversation Tips

Track Growth with a Gentle Schedule

Growth spurts happen. Keeping notes helps you and your family spot when it is time to refresh sizes.

Check your fit every 3–4 months or when tops start pulling around the chest.
Keep a growth log; note date, band measurement, bust measurement, and favourite styles.
Adjust straps every few weeks—growing shoulders and posture changes affect strap length.
Replace bras when the band stretches out or the cups feel too snug/loose.

Growth tracker

Save your updated measurements and style preferences in one place. Use the printable worksheet to log changes every few months.

Download Growth Tracker

Keep Learning Together

Teens and parents can explore these guides to stay informed and confident about fit decisions.

Step-by-step measurement guide with visuals Understand cup fit as your size evolves Find bralette styles for comfort and layering See how sizes can change later in life stages

Frequently Asked Questions

How do I know when it’s time for my first bra?

When growing tissue feels sore, you want extra coverage, or clothes feel more comfortable with light support, it is a good time to try a bralette or sports bra. Everyone’s timeline is different, so choose what feels right for you.

Should I involve a parent or guardian?

Yes. A trusted adult can help with measurements, shopping, and returns. If you prefer privacy, online guides and printable worksheets can help you measure by yourself.

What if one breast is larger than the other?

That is very common. Fit the bra to the fuller side and adjust straps on the smaller side. Removable padding or inserts can help even out silhouettes if you want them.