Bra Size Calculator

Enter your underbust (band) and bust measurements. Choose the unit (inches or centimetres). The calculator provides a suggested band and cup size (US/UK-style).

Underbust (band) Bust

Inches Centimetres (cm)

Calculate Reset

Suggested Size (guide)

Copy

Note: sizing conventions vary by country and brand. This calculator uses a common method (convert to inches, round band size to the nearest even number, then map bust–band difference to cup letters). Use as a guide and try on bras for the best fit.

Bra Size Calculator Online – Find Your Perfect Fit Easily

Intro

A Bra Size Calculator online is a simple yet powerful tool that helps women determine their correct bra size quickly and accurately. Many women wear the wrong size without realizing it, leading to discomfort, poor support, and health issues like back pain.

Instead of guessing sizes or relying on trial and error, this calculator uses your band measurement and bust measurement to determine your perfect bra size in seconds. Whether shopping online or in-store, the Bra Size Calculator ensures you always choose the right fit.

---

Formula / Working

The calculator works by taking two main measurements:

1. Band Size (Underbust): Measure around your ribcage, just under your bust.
2. Bust Size (Overbust): Measure around the fullest part of your bust.

Step 1 – Band Size:

• Round the underbust measurement to the nearest whole number.
• If the number is even, that’s your band size.
• If odd, round up to the nearest even number.

Step 2 – Cup Size: Cup Size=Bust Measurement−Band MeasurementCup \, Size = Bust \, Measurement – Band \, MeasurementCupSize=BustMeasurement−BandMeasurement

Then use the difference to determine cup size:

• 1 inch = A
• 2 inches = B
• 3 inches = C
• 4 inches = D
• 5 inches = DD/E
• 6 inches = DDD/F, and so on.

Example:

• Band = 34 inches
• Bust = 37 inches
• Difference = 3 inches → Cup = C
• Result: 34C

---

Step-by-Step Usage

Here’s how to use the Bra Size Calculator online:

1. Measure your underbust (ribcage, just below the bust).
2. Measure your bust size (around the fullest part of your chest).
3. Enter both numbers into the calculator.
4. The tool automatically applies the formula and gives you your correct bra size.

---

Examples

Example 1

• Underbust = 32 inches
• Bust = 35 inches
• Band = 32 (rounded to even number)
• Difference = 3 inches → Cup C
• Result = 32C

---

Example 2

• Underbust = 36 inches
• Bust = 41 inches
• Band = 36
• Difference = 5 inches → Cup DD/E
• Result = 36DD/E

---

Example 3

• Underbust = 30 inches
• Bust = 32 inches
• Band = 30
• Difference = 2 inches → Cup B
• Result = 30B

---

Benefits of Using a Bra Size Calculator

✔️ Ensures comfort and proper support.
✔️ Helps avoid back, neck, and shoulder pain.
✔️ Saves time when shopping online.
✔️ Prevents wasted money on wrong-sized bras.
✔️ Works for all body types.

---

FAQs

1. How accurate is the Bra Size Calculator?
It’s highly accurate if you measure correctly. For the best results, measure while wearing a non-padded bra.

2. Should I round measurements?
Yes, always round band size to the nearest even number.

3. Do bra sizes vary by brand?
Yes, but the calculator gives you a reliable starting size. You may need small adjustments depending on the brand.

4. Can I use this tool for sports bras?
Yes, knowing your true size ensures better support when choosing sports bras.

5. How often should I measure my bra size?
At least once a year, or whenever you notice weight changes, pregnancy, or discomfort.