How to Measure Your Bra Size at Home (Step by Step)
23 June 2026
Wearing the right bra size makes all the difference to comfort and support. The good news: you can measure your bra size at home in two minutes with just a soft measuring tape. Here's how.
What you need
A soft measuring tape and a non-padded bra (or no bra). Measure in front of a mirror, keeping the tape snug but not tight.
Step 1: Measure your band size
Wrap the tape around your ribcage, directly under your bust, keeping it level all the way around. Round to the nearest whole number in inches — this is your band size (e.g., 32, 34, 36).
Step 2: Measure your bust
Wrap the tape around the fullest part of your bust, keeping it level. Note this measurement in inches.
Step 3: Find your cup size
Subtract your band measurement from your bust measurement. The difference gives your cup size:
| Difference (inches) | Cup size |
|---|---|
| 1 | A |
| 2 | B |
| 3 | C |
| 4 | D |
| 5 | DD / E |
For example, a 34-inch band and a 37-inch bust = a 3-inch difference = a 34C.
Fit tips
- The band should sit level and snug — most support comes from the band, not the straps.
- Straps shouldn't dig in or slip off.
- The centre should lie flat against your chest, and cups should fully contain the bust with no spillage or gaping.
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Frequently asked questions
How do I measure my bra size without a measuring tape? Use a piece of string or a phone charging cable to wrap around, mark the length, then measure it against a ruler.
What if I'm between sizes? If your band measurement is an odd number, round down for a snugger fit or up for more comfort, and adjust the cup accordingly (sister sizing).
How often should I re-measure? Re-measure every 6–12 months, or after any noticeable weight change, pregnancy or breastfeeding.
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