Wind Speed Converter

Type in a value (except Beaufort)  
kilometers per hour
meters per second
miles per hour 
feet per second
meters per minute
feet per minute


Beaufort number Speed in knots Description Beschrijving Sea conditions Wave height in meter Land conditions
0 <1 Calm Stil Flat - Calm. Smoke rises vertically
1 1-3 Light air Zwakke wind Ripples without crests 0,0 Wind motion visible in smoke
2 4-6 Light breeze Zwakke wind Small wavelets. Crests of glassy appearance, not breaking 0,1 Wind felt on exposed skin. Leaves rustle
3 7-10 Gentle breeze Matige wind Large wavelets. Crests begin to break; scattered whitecaps 0,4 Leaves and smaller twigs in constant motion
4 11-16 Moderate breeze Matige wind Small waves 1 Dust and loose paper raised. Small branches begin to move
5 17-21 Fresh breeze Vrij krachtige wind Moderate (1.2 m) longer waves. Some foam and spray 2 Smaller trees sway
6 22-27 Strong breeze Krachtige wind Large waves with foam crests and some spray 3 Large branches in motion. Whistling heard in overhead wires. Umbrella use becomes difficult
7 28-33 Near gale Harde wind Sea heaps up and foam begins to streak 4 Whole trees in motion. Effort needed to walk against the wind
8 34-40 Gale Stormachtig Moderately high waves with breaking crests forming spindrift. Streaks of foam 5,5 Twigs broken from trees. Cars veer on road
9 41-47 Strong gale Storm High waves (2.75 m) with dense foam. Wave crests start to roll over. Considerable spray 7 Light structure damage
10 48--55 Storm Zware storm Very high waves. The sea surface is white and there is considerable tumbling. Visibility is reduced 9 Trees uprooted Considerable structural damage
11 56-63 Violent storm Zeer zware storm Exceptionally high waves 11,5 Widespread structural damage
12 >64 Hurricane Orkaan Huge waves. Air filled with foam and spray. Sea completely white with driving spray. Visibility very greatly reduced 14+ Considerable and widespread damage to structures