Beaufort ScaleKilometers per Hour to Beaufort

km/h to B

Snapshot

1 Kilometers per hour equals 0 Beaufort. Conversion Encyclopedia uses the same fixed conversion basis across the calculator, common values, and reverse page for this page.

Reference basis: This conversion is threshold-based and maps values to the nearest valid Beaufort level.
Example: For 3.0096 Kilometers per hour, the mapped result equals 1 Beaufort.
Use the reverse page if you need the opposite direction with the same basis.

Use the interactive calculator below for custom values and the common-value table for quick checks.

Interactive conversion

Converter Calculator

0 Beaufort (B)

Switch

Machine access

Available to apps and AI agents

km/h to B can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The identifiers below select the same calculation as the calculator.

Machine-readable identifiers

Conversion family: beaufort-scale
Source unit: kilometer_per_hour
Target unit: beaufort

The JSON API and OpenAPI specification use the identifiers to reach the conversion engine. WebMCP lets compatible AI agents request the same calculation.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "beaufort-scale",
  "value": 1,
  "from": "kilometer_per_hour",
  "to": "beaufort"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "beaufort-scale",
    "value": 1,
    "from": "kilometer_per_hour",
    "to": "beaufort",
    "result": {
      "raw": 0,
      "display": "0"
    },
    "canonicalPath": "/beaufort-scale/kilometers-per-hour-to-beaufort/"
  }
}

Full API documentation

Explanation

Formula: B = round((v / 0.836)^(2/3)), clamped to 0-12 after normalizing speed to m/s. Why: the reverse route maps continuous wind speed into the nearest discrete Beaufort force level.

Kilometers per hour (km/h): a common land-speed unit often used in weather reporting.

Beaufort (B): a standardized empirical wind-force scale from 0 to 12 used to describe observed wind conditions.

This route is useful when classifying measured kilometers per hour wind speeds into standard Beaufort force levels for charts, marine conditions, and weather reporting.

This conversion is not a simple shared factor in every direction: Beaufort routes use a standardized wind-force mapping, and reverse pages round to the nearest valid force level and clamp results to 0 through 12.

Method & Reference

Method basis: deterministic threshold mapping shown in Snapshot.
Equation reference: B = round((v / 0.836)^(2/3)), clamped to 0-12
Consistency rule: threshold, rounding, and clamping rules stay fixed so outputs remain reproducible.

Common Conversion Values

Kilometers per hour (km/h)	Beaufort (B)
0	0
3.0096	1
8.512434	2
15.63834	3
24.0768	4
33.648351	5
44.231906	6
55.738572	7
68.099474	8
81.2592	9
95.171908	10
109.798854	11
125.106723	12

Questions & answers

Frequently Asked Questions

What standard is used for Beaufort conversion?

This page uses v = 0.836 * B^(3/2) at 10 m over open water, with exact unit factors for m/s, km/h, mph, and knots.

How is speed to Beaufort handled?

Reverse pages compute B = (v / 0.836)^(2/3), then round to the nearest integer and clamp the result to 0 through 12.

How do I switch direction?

Use Switch Units to open the dedicated mirror page for the reverse conversion.