Parawing size calculator

The formula — and where it comes from

size = base(wind) × (weight / 80 kg) × discipline × learning + skin, snapped to the common size ladder.

• base(wind) for an 80 kg rider on a single-skin: 12–15 kn → 5.0 · 15–18 → 4.2 · 18–21 → 3.6 · 21–24 → 3.0 · 24–28 → 2.4 · 28–34 → 2.1 · 34+ → 1.8 m². Below 12 kn a parawing day is marginal — go bigger foil, not bigger wing.
• Weight scales linearly ("size like an inflatable wing"): a 70–85 kg rider covers 15–25 kn on a 4.0–5.0 m² quiver — the community baseline rule.
• Discipline: upwind/race −10% (size down for upwind work); freeride and downwind neutral.
• Learning: +15% (size up while learning; forgiving low end beats top-end speed).
• Double-skin / hybrid: +1.0 m² versus single-skin.

Sources: community sizing consensus compiled in our brand research from Seabreeze and Progression Project threads; The Inertia's parawing test rankings; MACkite's on-water test of a 2.5 m² at 90 kg (usable 22–30+ kn); manufacturer baselines (Ozone rates at 80 kg, F-One and Flysurfer at 75 kg — BRM publishes no ranges at all). Manufacturer top ends are treated as optimistic by 3–5 kn throughout.

Pending: re-calibration against our own race GPS logs (Leucate → Lake Garda 2026) once published.