Kayak Wind Resistance Calculator
Calculate wind resistance and speed penalty on a kayak from wind speed and paddle heading.
Returns drag, headwind, and watts to maintain target pace.
Wind exerts a drag force on your kayak and body above the waterline. The drag force increases with the square of the apparent wind speed — doubling wind speed quadruples the drag.
Drag force formula: F = 0.5 × rho × Cd × A × v²
Where:
- rho = air density (~1.225 kg/m³ at sea level)
- Cd = drag coefficient (~1.0 for a seated paddler broadside)
- A = frontal area (approx. 0.5 m² for paddler + kayak bow)
- v = apparent wind speed (m/s)
Effect on paddling speed: Each 1 N of drag requires approximately 0.3 W of extra power at typical kayak speeds. At 4 knots, a 20 N headwind drag reduces effective speed by roughly 0.5–1 knot.
Practical wind thresholds for sea kayaking:
- Force 1–2 (1–11 km/h): Negligible effect, ideal conditions
- Force 3 (12–19 km/h): Light headwind: slight effort increase
- Force 4 (20–28 km/h): Moderate headwind: noticeable slowdown
- Force 5 (29–38 km/h): Fresh breeze: significant effort increase, spray
- Force 6+ (39+ km/h): Strong wind: advanced paddlers only, high risk
Tailwind benefit: A following wind reduces headwater drag and can add 0.5–1.5 knots to your effective speed. Unlike a headwind, a strong tailwind can make control harder — quartering waves may require constant bracing.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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