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Free Wind Speed Guide

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Find out what it all means

  • F1 to F12
  • Speed in knots,
  • Speed in miles per hour
  • Speed in kilometres per hour,
  • Wave height
  • Visible Conditions
  • Photos


FREE to print and download

Beaufort Scale Force

Wind in MPH

Wind  in Knots

Wind  in Km/h

Description - Wave Heights—Visible Condition

Force 0




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


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


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 - 27

40 – 60

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.



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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