Beaufort Scale Converter
Convert your measured wind speed into the classical Beaufort number (0–12) and see the description (calm, gentle breeze, storm…). Supports knots, km/h, m/s and mph, and also converts back from Beaufort to typical speed ranges.
Converted 10 km/h → Beaufort 2 (light breeze)
Beaufort number
0
Description
Calm
Typical range
0 – 1 km/h
Beaufort scale (0–12)
| Force | Name | m/s | km/h | knots | Sea / Land effects (short) |
|---|
How conversion works
The Beaufort scale is defined by ranges. For example, 6–11 km/h → Beaufort 2. So to convert, we:
- Normalize your input to m/s.
- Find the scale entry whose range contains that m/s value.
- Return the number, name, and typical range in your original unit.
Example: 10 km/h
10 km/h ÷ 3.6 = 2.78 m/s, which is in the range 1.6–3.3 m/s → Beaufort 2.
Standard ranges used
We follow common international tables (WMO, Met Office, national met services). Minor rounding may occur between knots and km/h, but the Beaufort number stays the same.
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
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Formula (extracted text)
Example: 10 km/h 10 km/h ÷ 3.6 = 2.78 m/s, which is in the range 1.6–3.3 m/s → Beaufort 2.
Variables and units
- No variables provided in audit spec.
Sources (authoritative):
- NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures - FTC — Consumer advice — consumer.ftc.gov · Accessed 2026-01-19
https://consumer.ftc.gov/
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
- Initial audit spec draft generated from HTML extraction (review required).
- Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
- Confirm sources are authoritative and relevant to the calculator methodology.