Adult Sweater Size Chart (Chest)
Adult sweater sizing is built around chest circumference, but the number on this chart is a body measurement, not the sweater's own finished measurement — the gap between the two is ease, and it's what actually determines whether a sweater sized "Medium" feels fitted, relaxed, or oversized on a Medium-chested body.
The chart
| Size label | Chest |
|---|---|
| Adult XS | 30–32 in |
| Adult S | 33–35 in |
| Adult M | 36–39 in |
| Adult L | 40–43 in |
| Adult XL | 44–47 in |
| Adult 2XL | 48–51 in |
| Adult 3XL | 52–55 in |
These bands follow the same body-measurement convention used across this site's baby & child and toddler & child charts, extended into the adult range.
Why this chart alone doesn't tell you what to cast on
A sweater's actual finished chest circumference — the number that determines fit — equals your body measurement plus or minus ease, and ease is a design decision, not a fixed offset this chart can supply on its own. See the ease guide for how much to add or subtract for a fitted, relaxed, or oversized look before you ever touch the Cast-On Calculator.
Measuring your own chest correctly
Measure around the fullest part of the chest/bust, with a soft tape held snug but not compressed, arms relaxed at your sides — a tape pulled too tight or measured over bulky clothing both throw off the result more than most people expect for a garment this size-sensitive. Re-measure if it's been a while since your last check; body measurements do shift over time.
Why gauge amplifies this chart's stakes
A tiny gauge slip, multiplied across a chest circumference this large, compounds into real inches of difference in the finished piece — the adult-average and adult-plus sweater pages walk through exactly how much, using this chart's own numbers, and why swatching earns more care here than on almost any other project type.
Between two sizes
If your chest measurement falls between two chart bands, the choice comes down to the ease you actually want — sizing to the smaller band with more positive ease, or the larger band with less, can land on the identical finished measurement either way. Check the specific pattern's finished-measurement chart (not just its size label) to see which starting size gets you there with the least recalculation.
FAQ
Does this chart account for different body proportions at the same chest measurement? No — two people can share an identical chest measurement with different shoulder width, arm length, or torso proportions, all of which a single chest-based chart can't capture; check a specific pattern's full schematic, not just its size label, if proportions beyond chest matter for your fit.
Is there a separate chart for cardigans? Cardigans use the same chest-based body measurements — see the adult cardigan size chart for the cardigan-specific fit considerations (front bands, button spacing) beyond the shared chest numbers.
Should I size to my current measurement or plan for future weight change? Size to your current, actual measurement — a garment built around a hoped-for future measurement risks fitting poorly in the meantime, and it's far easier to make a well-fitted new piece later than to salvage one sized around a number that never quite matched.