Free Wind Speed Guide to Print or Download
Classic Sailing hopes you find our
Beaufort Scale Conversion Sheet helpful.
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Beaufort Wind Scale in Miles per hour (Mph), knots and Kilometers per hour (Km/h) |
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Beaufort Scale Force |
Wind in MPH | Wind in Knots | Wind in Km/h | Description - Wave Heights—Visible Condition |
|
Force 0 |
0-1 | 0-1 | 0-1 |
Calm; Ht 0.0m ~ At sea no waves - glassy like appearance of sea. On land smoke rises vertically. |
| Force 1 | 1-4 | 1-3 | 2-6 |
Light Airs Ht 0m ~ At Sea wind makes glassy ripples on water. On land direction of wind shown by smoke but not by wind vanes |
| Force 2 | 4-7 | 4-6 | 7-11 |
Light breeze Ht 0.1m ~ At Sea smooth wavelets On land wind felt on face; leaves rustle; ordinary wind vane moved by wind |
| Force 3 | 8-12 | 7-10 | 13-19 |
Gentle breeze Ht 0.4m Slight ~ At sea slight waves no white horses. On land eaves and small twigs in constant motion; wind extends light flag. |
| Force 4 | 13-18 | 11-16 | 20-30 |
Moderate breeze Ht 1m - Slight to moderate ~ At Sea waves described as with occasional white horses. On land raises dust and loose paper; small branches are moved |
| Force 5 | 19-24 | 17-21 | 31-39 |
Fresh breeze Ht 2m Moderate ~ At sea consistent white horses. On land small trees in leaf begin to sway; crested wavelets form on lakes. |
| Force 6 | 25-31 | 22-17 | 40-50 |
Strong breeze Ht 3m Rough At Sea large waves start to form, more extensive white foam crests, some blown spray. On land large branches in motion; telephone wires whistle; umbrellas unsafe |
| Force 7 | 32-38 | 28-33 | 51-61 |
Moderate (near) gale Ht 4m Rough to very rough. At Sea waves begin to heap up and streaks begin to appear down the waves. On land whole trees in motion; inconvenience in walking against wind |
| Force 8 | 39-46 | 34-40 | 62-74 |
Fresh gale Ht 5.5m Very rough to high At Sea waves get longer - crests break into spindrift and the streaks become more pronounced. On land breaks twigs off trees; generally impedes progress |
| Force 9 | 47-54 | 41-47 | 75-88 |
Strong or severe gale Ht 7m High At Sea high waves and dense streaks of foam may begin to affect visibility. On land slight structural damage occurs; chimney pots and slates removed |
| Force 10 | 55-63 | 48-55 | 89-102 |
Whole gale or Storm - Ht 9m Very High At Sea very high waves with overhanging crests, lots of spray makes the sea almost white, visibility seriously affected. On land trees uprooted; considerable structural damage occurs |
| Force 11 | 64-72 | 56-63 | 103 117 |
Violent Storm Ht 11m Very High At Sea exceptionally high waves and a complete coverage of long white foam patches. All crests blown into froth. On land very rarely experienced; accompanied by widespread damage. |
| Force 12 | 73+ | 64+ | 118+ |
Hurricane Ht 14m plus Phenomenal At sea the air is completely filled with driving spray, visibility extremely difficult. On land devastation occurs. |
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