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Beaufort Scale Poster, beaufort poster, wind force, wind speed
Beaufort Scale Poster

From 29,00

From 29,00

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Beaufort Scale Poster

From 29,00

“Today we have a force 5 wind”. Fine, but what does that mean? Translation : “Hoist up sailors, we have a fresh breeze and a wind of about 20 knots”.
With this Beaufort Scale Poster, you will always have in mind the conversions between the Beaufort scale and the wind speed in Km/h and Knots.

How is the frame?

It's a 1 to 2 cm thick (0.4 to 0.8″) wood frame, paired with unbreakable clear plexiglas. Its flawless design and the choice between 3 colors will match any room and any style. It has a hanging kit to hang it on the wall vertically and horizontally. The frame and poster are delivered unassembled.

Frog Posters cadres frames
Frog Posters cadres frames

What is Frog Posters?

Frog Posters is a French lifestyle brand. It's culture on your walls, your cheat sheet, a wink to your curiosity, to your gourmet side, it's a glass of rosé between friends. No stock, the posters are designed by Melanie, then printed on-demand as close as possible to the place of delivery to limit our carbon footprint. Discover our mission!

When will I receive my poster?

The posters are printed on-demand for the sake of reasoned production. You will receive it between 5 and 10 working days. Everything is explained in our delivery and returns page. If you have any questions, please contact us at

How are shipments made?

They are sent by tracked mail, in reinforced cardboard packaging! We will send you a link to allow you to track the delivery of your package.

Created in 1805 by the British admiral Francis Beaufort (1774-1857), the Beaufort scale measures the strength of the wind in 13 degrees, from force 0 (Calm) to force 12 (Hurricane). The Beaufort degree corresponds to the sea state according to the wind speed.

Where does the Beaufort scale come from?

The Beaufort scale is a measurement scale from 0 to 12 degrees that was created empirically, by comparing the average wind speed for 10 minutes.

Originally, a beaufort degree corresponds to the sea state associated with an average wind speed and the presence of foam and spray. Of course, the degrees are less accurate than measuring the wind speed with an anemometer, but at sea it is very practical to estimate the wind speed just by observing the effects of the wind on the sea surface.

It was the British admiral Francis Beaufort who invented this scale in 1805.

Why was the Beaufort scale created?

The purpose of its creation was to help the commanders of British warships to appreciate the wind and sea conditions. At the time of the Napoleonic Wars, the English had built ships in droves and recruited many officers. Young and willing to do anything to prove their worth, these officers did not reduce sail until late in the game, which frequently resulted in broken masts, torn sails or men overboard.

The Francis Beaufort scale was accompanied by a series of instructions on how to adapt the sails to wind and sea conditions.

The degrees of the Beaufort scale

The degrees of the Beaufort Scale are as follows:

Strength 0: Calm. The sea is smooth as a mirror, without waves.
Force 1: Light air The sea has a few ripples, but they don’t make foam.
Force 2: Light breeze. There are waves, but they do not break.
Force 3: Gentle breeze Small waves of less than 1m appear, and we can see some scattered white horses
Force 4: Moderate breeze The waves can reach 2m in height, and the white horses are numerous on the water.
Force 5 : Fresh breeze The tree tops shake, the waves can reach 3m.
Force 6: Strong breeze The wind whistles, the waves are crowned with a crest of foam, the waves reach 3 to 4m.
Force 7 : High wind, moderate gale, near gale The harbourmasters advise the boats not to go out. The waves can now reach 5,5m, we observe foam trails.
Force 8 : Gale, fresh gale Walking against the wind becomes almost impossible. At the crest of the waves you can see swirls of foam, the waves reach up to 7.5 m.
Force 9 : Strong/severe gale The roof tiles are flying off, the breaking waves are now reaching 10m, and the visibility is reduced by the spray.
Force 10 : Storm, whole gale Some trees are uprooted, and the surface of the sea looks white. The waves of almost 12m break in an intense and brutal way.
Force 11 : Violent storm The visibility is still reduced and the sea is completely covered with foamy banks. The 15m high waves create impressive troughs in which small ships can be lost from sight at times.
Force 12 : Hurricane The air is saturated with foam and spray; the sea is totally white, the waves are all over 15m.

How to convert the Beaufort scale to knots?

To convert the Beaufort scale to knots, the following equation can be used: Beaufort = Knots/5 + 1

1 knot = 0.514 m/s
1 knot = 1.852 Km/h

Additional information


30×40 cm, 50×70 cm, 70×100 cm


Poster in English


200g (80lb) uncoated museum quality paper


No frame, Black frame, White frame, Wooden frame


Frog Posters


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Frog Posters

At Frog Posters, we have a mission: to glamorize your walls and enrich your knowledge with unique, useful and eco-friendly posters.
Frog Posters are an ode to the passionate, the curious, the "bon vivants", the cheerful and the "folie douce".

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