Formula
All-mountain sits between chin and nose, using the same landmark offsets as the ski page: chin is 8 inches under height, nose is 5.5 inches under. Park is that band, 2 inches shorter. Powder runs from an inch under the nose to an inch under head height.
weight shift = ±1 in if weight is more than 15 lb off the reference
reference weight = 100 + 5 × (height − 60)
wide = US men’s boot ≥ 11
The offsets, the 15 lb threshold, and the boot cutoff are this page’s reading of typical charts. They are not a single brand’s size table.
Worked examples
70 in, 160 lb, all-mountain, boot 11. 62 to 64.5 in. Reference weight is 150 lb, so no shift. Wide is flagged.
70 in, 160 lb, park, boot 9. 60 to 62.5 in. Wide is not flagged.
70 in, 180 lb, powder. Nose − 1 to height − 1 is 63.5 to 69. Weight is 30 lb over, so +1 in: 64.5 to 70 in.
Reference
70 inch rider, 160 lb. No weight shift at this weight. Wide depends on the boot, not the style.
| Style | Range |
|---|---|
| Park | 60–62.5 in |
| All-mountain | 62–64.5 in |
| Powder | 63.5–69 in |
Questions
What board length fits a 5 ft 10 in all-mountain rider?
Chin to nose on 70 inches is 62 to 64.5 inches. At 160 lb the reference weight is 150, which is not more than 15 lb away, so the range does not shift. A US men’s boot of 11 or larger flags a wide board. That flag is on for an 11.
How do park and powder differ?
Park is the all-mountain range, 2 inches shorter. Powder starts an inch under the nose and runs to an inch under head height. Manufacturer charts disagree by several centimetres. Use this as a starting band, then read the board’s own size chart.
When is a wide board flagged?
At a US men’s boot size of 11 or larger. The flag does not change the length. It says the waist may be too narrow for that boot and you should look at a wide model.
Sources
- Manufacturer size charts: all-mountain between chin and nose, park shorter, powder longer. Offsets here: chin −8 in, nose −5.5 in; park −2 in from that band; powder from nose − 1 in to height − 1 in.
- Weight shift ±1 in beyond 15 lb from the same reference weight as the ski page. Wide board at US men’s boot size 11 or larger.