Wind Speed and Beaufort Converter
Convert between the Beaufort scale, km/h, mph, knots, and m/s for wind speed.
Type in any field — the others update instantly. Or select a Beaufort force.
The Beaufort scale classifies wind speed by observed conditions.
Speed conversions:
- 1 knot = 1.852 km/h = 1.15078 mph = 0.51444 m/s
- 1 m/s = 3.6 km/h = 2.23694 mph = 1.94384 knots
Beaufort scale reference:
| Force | Description | km/h | mph | knots | m/s |
|---|---|---|---|---|---|
| 0 | Calm | 0–1 | 0–1 | 0–1 | 0–0.2 |
| 1 | Light air | 1–5 | 1–3 | 1–3 | 0.3–1.5 |
| 2 | Light breeze | 6–11 | 4–7 | 4–6 | 1.6–3.3 |
| 3 | Gentle breeze | 12–19 | 8–12 | 7–10 | 3.4–5.4 |
| 4 | Moderate breeze | 20–28 | 13–18 | 11–16 | 5.5–7.9 |
| 5 | Fresh breeze | 29–38 | 19–24 | 17–21 | 8.0–10.7 |
| 6 | Strong breeze | 39–49 | 25–31 | 22–27 | 10.8–13.8 |
| 7 | Near gale | 50–61 | 32–38 | 28–33 | 13.9–17.1 |
| 8 | Gale | 62–74 | 39–46 | 34–40 | 17.2–20.7 |
| 9 | Strong gale | 75–88 | 47–54 | 41–47 | 20.8–24.4 |
| 10 | Storm | 89–102 | 55–63 | 48–55 | 24.5–28.4 |
| 11 | Violent storm | 103–117 | 64–72 | 56–63 | 28.5–32.6 |
| 12 | Hurricane | 118+ | 73+ | 64+ | 32.7+ |
Beaufort 6+ can make walking difficult. Beaufort 8+ can cause structural damage.