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)
Beaufort Scale Force
|Wind in MPH||Wind in Knots||Wind in Km/h||Description - Wave Heights—Visible Condition|
Calm; Ht 0.0m ~
At sea no waves - glassy like appearance of sea.
On land smoke rises vertically.
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
Light breeze Ht 0.1m ~
At Sea smooth wavelets
On land wind felt on face; leaves rustle; ordinary wind vane moved by wind
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.
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
Fresh breeze Ht 2m Moderate ~
At sea consistent white horses.
On land small trees in leaf begin to sway; crested wavelets form on lakes.
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
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
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
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
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.
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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