Bra Size Calculator

Bra MeasurementGuide

Learn how to measure yourself correctly for the most accurate bra size results. Follow our step-by-step guide with visual demonstrations.

1

Step 1: Measure Band Size

Measure around your ribcage, just below your bust

Instructions:

1
Remove your top and wear only a bra
2
Wrap the tape measure around your ribcage, just below your bust
3
Ensure the tape is level and snug but not tight
4
Record the measurement

Pro Tips:

The tape should be parallel to the ground
You should be able to breathe comfortably
Don't pull the tape too tight
Step 1: Measure Band Size
2

Step 2: Measure Bust Size

Measure around the fullest part of your bust

Instructions:

1
Keep the tape measure around the fullest part of your bust
2
Ensure the tape is level and not too tight
3
Breathe normally - don't hold your breath
4
Record the measurement

Pro Tips:

Measure at the fullest point, typically at nipple level
Keep the tape level all around
Don't compress your bust
Step 2: Measure Bust Size
3

Step 3: Calculate Your Size

Use our calculator to determine your perfect fit

Instructions:

1
Enter your measurements in our calculator
2
The system will automatically calculate your bra size
3
Results include band size, cup size, and full size
4
Use this as a starting point for shopping

Pro Tips:

Start with the calculated size
Try on different brands as they may fit differently
Consider sister sizes if needed

Ready to Calculate?

Enter your measurements and get instant results

Instant Results
International Sizes
Professional Accuracy
Start Calculating Now

Video Tutorial

If you need help, watch our detailed video tutorial to learn how to correctly measure your bra size.

YouTube 视频教程

Important Tips for Accurate Measurements

Measure in the morning when your bust is at its most natural state
Use a soft, flexible tape measure for accurate results
Don't pull the tape too tight - it should be snug but comfortable
If measurements fall between sizes, try both sizes
Different brands may fit differently even with the same size label
Consider getting professionally fitted for the most accurate results

Common Measurement Mistakes

❌ Measuring over clothes

Always measure directly on your skin or over a thin, unpadded bra

❌ Pulling the tape too tight

The tape should be snug but not constricting

❌ Measuring at the wrong level

Band measurement should be just below your bust, not at the waist

❌ Not keeping the tape level

Ensure the tape is parallel to the ground all around

Adjust your measurements for real-life scenarios

Full bust / plus size adjustments

Use flexible tape backed with powermesh support; take seated and standing measurements to compare band tension. Log strap groove depths to know when to replace bras.

What to do: Aim for a firm-but-breathable band. If seams dig, switch to multi-part cups with inner slings and revisit sister sizing.

Plus size fit guide

Postpartum or hormonal fluctuation

Measure weekly during the fourth trimester or when starting new medication. Capture morning vs evening bust readings to capture swelling changes.

What to do: Keep wireless support handy for tender days and note which hook column felt best after pumping or nursing.

Postpartum sizing tips

Athletic / high-impact training

Record pre- and post-workout rib measurements—core work can temporarily compress the diaphragm. Measure in cross-back posture if you primarily wear sports bras.

What to do: Use the tighter sister band for high-impact days, then loosen for recovery. Log strap slider positions in the rotation checklist.

Sports bra fitting roadmap

Set a re-measurement cadence

Monthly spot check

After cycle changes, new workouts, or noticeable weight shifts.

Measure bust and band, compare to your baseline log, and note any strap groove depth or fabric stress.

Quarterly deep audit

Every 3 months or at the start of a new season.

Review all bras for stretched bands (>2 inches), mark replacements, and refresh calculator results.

On-demand remeasure

After pregnancy, surgery, hormonal therapy, or major training changes.

Capture measurements over several days to smooth fluctuations; consult professional fitters if unsure.

Prepare your environment for consistent measurements

  • Use a large mirror and bright, even lighting so you can keep the tape level.
  • Measure after a lukewarm shower—skin is relaxed and sits naturally on the ribcage.
  • Avoid salty meals or high-impact workouts immediately before measuring to prevent temporary swelling.
  • Stand with neutral posture (ears over shoulders, ribs stacked) and take one deep breath before reading the tape.

Ready to Calculate Your Size?

Now that you know how to measure, use our calculator to find your perfect fit.

Calculate My SizeView Size Charts

Downloadable measurement toolkit

Measurement log checklist (PDF)Record rib and bust measurements, sister sizes, and fit notes across different dates.Support component audit (PDF)Use alongside measurements to verify bands, straps, and cup structure.