Beaufort Scale Calculator
Convert wind speed to Beaufort scale force and sea state description, or the reverse, with this free weather calculator in your browser.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the wind speed in km/h.
- Read the Beaufort force and description.
How it works
The wind speed is matched against the Beaufort scale's bands (force 0–12).
Worked example
30 km/h. = Force 5, 'Fresh breeze'.
Common mistakes
- Mixing up gusts with sustained wind — Beaufort describes sustained speed.
- Entering knots where km/h is expected (1 knot ≈ 1.85 km/h).
Frequently asked questions
What is the Beaufort scale?
A 0–12 scale linking wind speed to observable effects on land and sea, from calm (0) to hurricane force (12).
Related tools
- Knots Converter
- Beaufort Wind Scale Calculator
- Wind Speed at Height Calculator
- Apparent Temperature Calculator
- Lightning Distance Calculator
- Rainfall Intensity Calculator
Explore more in Weather & Environmental Monitoring.
Cite this tool
Zerdly. (2026). Beaufort Scale Calculator. Retrieved from https://www.zerdly.com/tools/beaufort-scale-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.