How to Use This Calculator

Our Beaufort Scale Calculator converts measured wind speeds into Beaufort numbers with detailed condition descriptions.

Step-by-Step Instructions

Enter the wind speed value in the input field
Select your preferred unit (m/s, km/h, mph, or knots)
Click 'Calculate Beaufort Scale' to get results
Review the Beaufort number, description, and condition details
Export results to CSV or share them as needed

Applications of Beaufort Scale

The Beaufort Scale is used across various fields and industries:

Marine Navigation

Sailors and ship captains use the Beaufort Scale to assess sailing conditions, plan routes, and ensure safety at sea.

Weather Forecasting

Meteorologists incorporate Beaufort numbers in public forecasts to communicate wind conditions in an easily understandable format.

Aviation

Pilots reference the Beaufort Scale for flight planning and understanding surface wind conditions at airports.

Outdoor Activities

Hikers, campers, and outdoor enthusiasts use the scale to gauge suitable conditions for activities and assess potential hazards.

Emergency Management

Emergency services use Beaufort ratings to prepare for severe weather events and communicate risk levels to the public.

Complete Beaufort Scale Reference

The following table provides a comprehensive reference for all Beaufort numbers with corresponding wind speeds and wave heights:

Beaufort #	Description	Wind Speed (m/s)	Wave Height (m)
0	Calm	0-0.2	0
1	Light Air	0.3-1.5	0-0.1
2	Light Breeze	1.6-3.3	0.1-0.5
3	Gentle Breeze	3.4-5.4	0.5-1.0
4	Moderate Breeze	5.5-7.9	1.0-2.0
5	Fresh Breeze	8.0-10.7	2.0-3.0
6	Strong Breeze	10.8-13.8	3.0-4.0
7	Near Gale	13.9-17.1	4.0-5.5
8	Gale	17.2-20.7	5.5-7.5
9	Strong Gale	20.8-24.4	7.0-10.0
10	Storm	24.5-28.4	9.0-12.5
11	Violent Storm	28.5-32.6	11.5-16.0
12	Hurricane Force	32.7+	14.0+

Best Practices for Using the Beaufort Scale

Follow these guidelines for accurate wind assessment and safe decision-making:

Always use measured wind speeds when available for greater accuracy
Consider local terrain and obstacles that may affect wind patterns
Remember that Beaufort observations are typically taken at 10 meters above ground level
Use multiple indicators (visual, auditory, tactile) when estimating Beaufort numbers without instruments
Be aware that sea state may lag behind wind changes, especially when winds are increasing
Consult official weather forecasts for severe weather warnings
Consider gustiness in addition to sustained wind speed for safety planning

Frequently Asked Questions

What is the difference between Beaufort Scale and actual wind speed?

The Beaufort Scale is a qualitative scale based on observations, while wind speed is a quantitative measurement. This calculator bridges the two by converting precise measurements into Beaufort numbers with condition descriptions.

How accurate is the Beaufort Scale?

When used by trained observers, the Beaufort Scale can estimate wind speeds within about 10-15% accuracy. However, actual anemometer measurements are always more precise.

Why does the scale only go to 12?

Originally, 12 was considered the maximum practical level for sailing ships. While extended scales exist (up to 17), the 0-12 range covers most practical applications and is universally recognized.

Can I use the Beaufort Scale on land?

Yes! While originally designed for sea conditions, the scale has been adapted with land-based observations such as tree movement, smoke behavior, and structural effects.

What Beaufort number is considered dangerous?

Beaufort 7 (Near Gale) and above are generally considered dangerous for small craft. Beaufort 10+ (Storm and above) poses significant risks to all vessels and land structures.

How do I estimate Beaufort number without instruments?

Observe visual indicators: flag movement, tree motion, wave formation, smoke drift, etc. Compare your observations with the descriptions in the Scale Reference table above.

Beaufort Scale Calculator

Wind Speed Input

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About Beaufort Scale

What is the Beaufort Scale?

Historical Background

Why It Matters