48H Bra Size
48H fits a 47–49 inch (119–124 cm) underbust and a full bust of about 57 inches (145 cm).
Last reviewed on 25 September 2026.
48H at a glance
| Underbust (band) | 47–49 in · 119–124 cm |
|---|---|
| Full bust | ≈ 57 in · 145 cm |
| Bust minus underbust | ≈ 9 in · 23 cm |
| Sister sizes (same cup volume) | — |
| UK / EU / FR / AU | 48FF · 110H · 125H · 26FF |
| One cup smaller | 48G |
| Approx. top size | 3X · UK 24–26 / US 20–22 |
Measurements for 48H
48H is built for an underbust ribcage measurement that falls in the 47–49 inch range, with a full-bust measurement around 57 inches. The band number — 48 — is a fuller band size where most of the support comes from a strong, snug band rather than the straps. The cup letter — H — describes the difference between the two measurements; an H cup (US) means the full bust is about nine inches larger than the underbust — the same volume is an FF in UK sizing. Well-engineered bands and reinforced wires are typically what hold a bra steady for a full day at this size.
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48H in Other Sizing Systems
EU, FR, and JP sizing read the band in centimetres, which is why 48H maps to 110H (EU), 125H (FR), and 110H (JP) — the same body, expressed in different units. AU sizing uses a small numeric scale (26FF for this band). UK sizing shares the band number with the US but parts ways at the cup once you go past D, so 48H reads as 48FF on a UK label.
Sister Sizes for 48H
These sizes have the same cup volume as 48H. Try them if the band feels too tight or too loose.
← Tighter band, bigger cup · Looser band, smaller cup →
Sister sizes are useful when the cup of your 48H fits well but the band is wrong — too loose by the end of the day, or too tight to clip up comfortably. Going one band smaller and one cup larger keeps the cup volume the same while tightening the band; going the other way loosens the band without losing cup space. Read the full sister-size matrix if you want to see how this works for every size at once.
Fit Tips for 48H
H cups call for maximum-support construction: reinforced bands, wider straps, and side panels. Specialist fuller-bust ranges are usually the most reliable source of styles in this cup.
If your 48H bra is gapping at the top of the cup, the cup may be too large or the wrong shape — try a demi-cup or balconette before assuming the size is wrong. If the centre piece between the cups (the gore) does not lay flat against your sternum, the cup is almost certainly too small; go up one cup. If the band rides up across your back during the day, the band has stretched out or was too loose to begin with — drop one band size and add one cup to keep the same cup volume.
For more detailed troubleshooting, the Fit Test on the home page covers six common visible problems and the size or shape change that usually addresses each one. The guide to measuring mistakes covers the most common reasons a calculation comes out wrong in the first place.
Related sizes
If 48H is close but not quite right, these neighbouring sizes are the most useful next places to look:
See every size at a glance on the full bra size index, or read how to measure your bra size if you are not sure 48H is right for you.
48H — frequently asked questions
What measurements are a 48H bra in inches and cm?
A 48H bra fits an underbust (ribcage) measurement of roughly 47 to 49 inches (119–124 cm) and a full-bust measurement of about 57 inches (145 cm). The cup letter H reflects the roughly 9-inch (23 cm) difference between those two numbers.
What size is equivalent to 48H? (sister sizes)
48H sits at the edge of the standard size range, so it has only a partial set of sister sizes. The general rule still holds: to tighten the band, drop one band size and add one cup; to loosen it, add one band size and drop one cup.
What is 48H in UK, EU, and other sizing systems?
48H (US) converts to 48FF in UK sizing, 110H in EU sizing, 125H in French sizing, 26FF in Australian sizing, and 110H in Japanese sizing. The body is the same; only the labelling system changes.
Is 48H a small or large bra size?
In terms of how common it is, this size pairs a fuller band with a fuller-bust cup. There is no universal "small" or "large" bra size — the same cup letter describes a different volume on every band — but within the full range BraCalc covers (bands 28–48, cups AA–H) this combination sits toward the fuller end.
Is 48H a small, medium, large, or XL?
As a rough guide, a 48 band usually matches size 3X in tops and bralettes — around UK dress size 24–26 (US 20–22). The band number drives this more than the cup letter, so 48H lands in the same letter size as other 48-band bras. With a fuller cup, many people go one size up in fitted tops so the bust has room. Letter sizing varies a lot between brands, so always check the brand's own chart.
What is the next size up or down from 48H?
Keeping the same 48 band, one size down is 48G. If you want a bigger or smaller band but the same cup volume, use a sister size instead: drop one band and add one cup, or the reverse. Remember that the cup letter is relative to the band — 50H has more cup volume than 48H, not the same.
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