Quick Answer
If you measure bra size with a bra, wear a thin non-padded bra that holds your bust naturally. Avoid padded, push-up, sports, minimizer, and heavily molded bras because they can change your bust measurement.
For the standard method, use the standard bra size measuring method as your main reference.
When This Method Makes Sense
- You are more comfortable measuring with light support.
- Your bra is unlined or very thinly lined.
- The bra does not compress, lift, or push your bust into a different shape.
Step-by-Step Instructions
- Choose a thin non-padded bra that feels comfortable and does not add volume.
- Measure underbust directly under the bra band with the tape level.
- Measure bust around the fullest point of the cups without pressing into the fabric.
- Check the tape in a mirror to make sure it is parallel to the floor.
- Repeat once and use the most consistent numbers.
Mistakes to Avoid
- Using a bra that is visibly too small or too loose.
- Measuring in a sports bra that compresses tissue.
- Letting straps or cup seams interfere with the tape.
- Using a push-up or molded bra as if it were non-padded.
When to Use the Calculator
Use the calculator after measuring in a non-padded bra, then confirm the result by checking whether the band stays level and the cups contain tissue without gaps or spillage.
Open the bra size calculator after you have both your band and bust measurements.
Frequently Asked Questions
Is it better to measure with or without a bra?
Both can work. Without a bra gives a natural measurement, while a thin non-padded bra can help if you need light support. Avoid bras that add or compress volume.
Can I measure in my everyday bra?
Only if it is thin, non-padded, and not stretched out. If your everyday bra changes your shape or no longer fits well, it can distort the result.
Can a sports bra be used for measuring?
No, a sports bra usually compresses breast tissue and can make the bust measurement too small.