Billabong Men's Size Guide Tops (Inches)
| SIZE | CHEST | WAIST | HIP |
| XS | 36 - 38 | 27.5 - 29.5 | 36 - 38 |
| S | 38 - 40 | 29.5 - 31.5 | 38 - 40 |
| M | 40 - 42 | 31.5 - 33.5 | 40 - 42 |
| L | 42 - 44 | 32.5 - 35.5 | 42 - 44 |
| XL | 44 - 46 | 36.5 - 38.5 | 44 - 47 |
| XXL | 46 - 48 | 38.5 - 40.5 | 47 - 50 |
Billabong Men's Size Guide Bottoms
| UK SIZE | EU/US SIZE |
| 28 | 28 |
| 30 | 30 |
| 31 | 31 |
| 32 | 32 |
| 33 | 33 |
| 34 | 34 |
| 36 | 36 |
| 38 | 38 |
Billabong Men's Snow (Inches)
| SIZE | CHEST WIDTH | WAIST WIDTH | HIPS WIDTH | HEIGHT | INSEAM |
| XS | 35 - 38 | 28 - 30 | 34 - 36 | 5'4" - 5'6" | 30 |
| S | 37 - 40 | 30 - 32 | 36 - 38 | 5'6" - 5'8" | 30 3/4 |
| M | 39 - 42 | 32 - 34 | 38 - 40 | 5'8" - 5'10" | 31 1/2 |
| L | 41 - 44 | 34 - 36 | 40 - 42 | 5'10" - 6' | 32 |
| XL | 43 - 46 | 36 - 38 | 42 - 44 | 6'2" - 6'4" | 33 |
| XXL | 45 - 48 | 38 - 40 | 44 - 46 | 6'4" - 6'6" | 34 |
Billabong Women's Size Guide Tops (Inches)
| SIZE | CHEST | WAIST | HIP |
| XS | 30.5 - 31.5 | 23 - 24 | 33 - 34 |
| S | 32.5 - 33.5 | 25 - 26 | 35 - 36 |
| M | 34.5 - 35.5 | 27 - 28 | 37 - 38 |
| L | 36.5 - 37.5 | 29 - 30 | 39 - 40 |
| XL | 38.5 | 31 | 41 |
Billabong Women's Size Guide Bottoms (Inches)
| UK SIZE | EU SIZE | US SIZE |
| 6 | 26 | 25 |
| - | 27 | 26 |
| 8 | 28 | 27 |
| - | 29 | 28 |
| 10 | 30 | 29 |
| 12 | 32 | 30 |
Billabong Women's Snow Guide (Inches)
| SIZE | CHEST WIDTH | WAIST WIDTH | HIPS WIDTH | HEIGHT | INSEAM |
| XS | 31.5 - 33 | 23.5 - 25 | 33 - 34.5 | 5'2" - 5'4" | 32 |
| S | 33 - 34.5 | 25 - 26 | 34.5 - 36 | 5'4" - 5'6" | 33 |
| M | 34.5 - 36 | 26 - 28 | 36 - 37.75 | 5'6" - 5'8" | 33.5 |
| L | 26 - 37.75 | 28 - 30 | 37.65 - 39.25 | 5'8" - 5'10" | 34 |
| XL | 37.75 - 39 | 30 -31.5 | 39.25 - 41 | 5'10" - 6' | 34.5 |
Billabong Boy's Bottoms Size Guide (Inches)
| AGE | BOTTOM SIZE |
| 8/9 yrs Slim | 22 |
| 8/9 yrs Regular | 24 |
| 9/10 yrs Slim | 23 |
| 9/10 yrs Regular | 25 |
| 11/12 yrs | 26 |
| 13/14 yrs | 27 |
Billabong Boy's Tops Size Guide (Inches)
| SIZE | CHEST | WAIST | HEIGHT | WEIGHT |
| S | 25" - 27.5" | 22" - 24" | 49" - 54" | 50 - 65 |
| M | 28" - 30.5" | 25" - 26" | 52" - 60.5" | 63 - 95 |
| L | 31" - 33.5" | 27" - 28" | 60" - 65" | 90 - 122 |
| XL | 34" - 36.5" | 29 - 30" | 65" - 68" | 110 - 140 |
Billabong Footwear Size Guide
| UK SIZE | EU SIZE | US SIZE | |
| 5 | 39 | 6 | 252 |
| 6 | 40 | 7 | 260.5 |
| 7 | 41 | 8 | 269 |
| 8 | 42 | 9 | 277.5 |
| 9 | 43 | 10 | 286 |
| 10 | 44 | 11 | 294.5 |
| 11 | 45 | 12 | 303 |
| 12 | 46 | 13 | 311.5 |
| 13 | 47 | 14 | 320 |
| 14 | 48 | 15 | 328.5 |
Billabong Size Guide Women's Wetsuits
| UK SIZE | HEIGHT (cm) | WEIGHT (kg) | CHEST (cm) | WAIST (cm) |
| 4 | 155-160 | 40-48 | 75-80 | 58-63 |
| 6 | 160-165 | 45-52 | 77-83 | 60-66 |
| 8 | 163-168 | 50-57 | 80-85 | 63-68 |
| 10 | 165-170 | 55-61 | 83-88 | 66-71 |
| 12 | 168-173 | 59-68 | 86-91 | 68-73 |
| 14 | 170-175 | 64-73 | 90-05 | 73-78 |
| 16 | 172-180 | 68-77 | 94-99 | 76-81 |
Billabong Size Guide Ladies Swimwear
| SIZE | UK SIZE | US SIZE | WAIST (inch) | HIPS AT FULLEST (inch) | BRA SIZE | BUST AT FULLEST (INCH) |
| XS | 6 | 0 | 24 | 34 | A | 31.5-32.5 |
| S | 8 | 1-3 | 25.5-26.5 | 35.5-36.5 | A | 33.5-34.5 |
| M | 10 | 5-7 | 27.5-28.5 | 37.5-38.5 | B | 35.5-36.5 |
| L | 12 | 9 | 29.5 | 39.5 | C | 37.5-38.5 |
| XL | 14 | 11 | 31 | 41 | D | 39.5-40.5 |
*Billabong swimwear follows a junior size scheme. Always size up when in doubt.
Billabong Size Guide Boots
| UK SIZE | US SIZE | EU SIZE |
| 4.5-5.5 | 6-7 | 37.5-38.5 |
| 5.5-6.5 | 7-8 | 38.5-40 |
| 7.5-8.5 | 9-10 | 41-42.5 |
| 9.5-10.5 | 11-12 | 43.5-44.5 |
Billabong Size Guide Men's Wetsuits
| UK SIZE | HEIGHT (cm) | WEIGHT (kg) | CHEST (cm) | WAIST (cm) |
| S | 168-173 | 61-68 | 91-97 | 74-79 |
| MS | 168-175 | 66-73 | 97-102 | 76-81 |
| M | 175-180 | 70-77 | 97-102 | 79-84 |
| MT | 180-185 | 75-82 | 99-102 | 79-84 |
| LS | 170-175 | 75-82 | 104-109 | 84-89 |
| L | 180-185 | 79-86 | 104-109 | 84-89 |
| LT | 185-195 | 84-91 | 104-109 | 84-89 |
| XLS | 173-178 | 79-86 | 109-112 | 91-97 |
| XL | 183-196 | 86-93 | 109-112 | 91-97 |
| XXL | 185-193 | 92-100 | 112-117 | 97-102 |