Reviewed
40H (UK 40FF) bra size
A 40H has a 40-inch band and a H cup, about 8 inches between band and bust. In the UK it is 40FF, in Australia 18FF and in Europe 90H.
- US
- 40H
- UK
- 40FF
- AU
- 18FF
- EU
- 90H
- FR
- 105H
Also fits (sister sizes): 38I firmer band · 42G looser band · all same-volume sizes ↓
40H measurements
- Snug underbust
- 40–41 in · 102–104 cm
- Bust, fullest part
- about 48 in · 121–123 cm
- Cup difference
- 8 in (H cup)
These are starting points from the band-and-cup method. Brands differ by about a size, so a two-minute measurement beats any chart.
40H sister sizes
Same cup volume, different band. If a 40H band feels too loose, go down a band and up a cup; if it feels tight, go up a band and down a cup.
If a 40H doesn't fit
- Band rides up at the back
- Try 38I
- Band digs in, cups fit
- Try 42G
- Spilling over the cups
- Try 40I
- Cups gape or wrinkle
- Try 40G
Not sure what's wrong? Run through the 4-point fit check.
40H questions
What is the sister size of 40H?
38I (one band down, one cup up) and 42G (one band up, one cup down). Sister sizes hold the same cup volume on a different band.
What is 40H in UK, Australian and European sizes?
UK 40FF, Australia 18FF, Europe 90H and France 105H. US and UK cup letters match up to DD and then split.
What measurements are a 40H?
A snug underbust of about 40–41 in (102–104 cm) and a bust of about 48 in (121–123 cm). Measure with the tape level and use the calculator for an exact result.
Is 40H a big size?
40H has a very full cup volume for a 40 band. Cup letters only mean something next to the band: a 40H holds the same as 28N or 30M.