Before you start
Use inches for both measurements to keep your result consistent, and measure at a relaxed, normal breath. If you can, re-check each number once more to confirm.
What you need
- Soft measuring tape or a printable tape plus a ruler.
- A mirror to confirm the tape stays level across your back.
- Notes or your phone to record your measurements.
What to wear
- A non-padded bra, bralette, or thin camisole to avoid added volume.
- Skip bulky tops or push-up bras that change your natural shape.
Step 1
Band Size (Underbust)
- Level the tape and measure your band size.
- Wrap the tape around the area just below the bust so it stays parallel to the floor.
- Keep it snug for a cosy, supportive fit, then round up to the next whole inch (example: 33.4 inches becomes 34 inches).
- Fitters recommend measuring after a normal exhale so the number reflects how your bra sits day-to-day.
Step 2
Bust Size (Overbust)
- Wrap the tape over the fullest part of your bust.
- Hold the tape edge-to-edge, close to your body, without compressing breast tissue.
- Keep the tape neither too tight nor too loose to prevent twisting, then round to the nearest whole inch (example: 38.6 inches becomes 39 inches).
- If your bust is asymmetrical, take the fuller side as the reference for a better overall fit.
Common measuring mistakes
- Mixing units (inches for one measurement and centimeters for the other).
- Letting the tape dip in the back or ride up across the front.
- Pulling the tape too tight, which lowers your bust reading.
- Measuring over thick clothing or padded bras that add volume.
- Only measuring once—repeating helps confirm accuracy.
If your results feel off, take a second pass in the same spot. Consistent numbers are a good signal that you're ready to calculate your size.
