Champion vs Under Armour: which size fits the same?
In tees, a Champion L is closest to an Under Armour L (the same around).
Tees
Champion and Under Armour tees measure about the same at the same size (within ¾″ around). A Champion L is closest to an Under Armour L (the same around).
| Champion | Chest · length | Closest Under Armour | Chest · length | Under Armour is |
|---|---|---|---|---|
| Champion S | 38″ · 27″ | Under Armour S | 40″ · 28¾″ | 2″ roomier |
| Champion M | 42″ · 28¾″ | Under Armour M | 43″ · 29¼″ | 1″ roomier |
| Champion L | 46″ · 30¼″ | Under Armour L | 46″ · 29¾″ | the same around |
| Champion XL | 50″ · 31¼″ | Under Armour XL | 49″ · 30¾″ | 1″ snugger |
| Champion XXL | 54″ · 32¾″ | Under Armour 3XL | 55″ · 32¾″ | 1″ roomier |
| Champion 3XL | 58″ · 33¾″ | none close |
From Champion: Champion Classic T-Shirt (T425), Champion Heritage Jersey T-Shirt (T105). From Under Armour: Under Armour Team Tech Tee (1376842), Under Armour Athletic 2.0 Tee (1383264). Relaxed and oversized cuts are left out.
More: Champion sizing · Under Armour sizing
Get your exact size in any of these
Add three shirts you own that fit well. FitCard compares their real measurements with every shirt here and tells you the one size to buy, and why, in terms of your own shirts. Free, no tape measure.
Garment measurements: the shirt itself, chest all the way around and length from shoulder to hem, from each brand's own chart or wholesale spec sheet, checked November 2026. Shirts with half or more cotton are shown as they come out of a dryer (about 2% less around and 4% shorter). Brands change their cuts, so check the shop's chart before you buy.