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Beaufort Wind Force and Unit Conversion

Convert mean wind speed and look up Beaufort force using published whole-knot intervals, with visible rounding and original measurement values.

Use this result well

Inputs that matter
Mean wind speed, Wind-speed unit, Sources and assumptions
Output to expect
Beaufort force from reported wind
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Beaufort force from reported wind

Convert wind to knots, round to the nearest whole knot for the published whole-knot table, then return Beaufort force 0–12. Display this rounding convention and the unrounded speed; do not add a force simply because the site is at sea.

Reported knot = floor(converted knots + 0.5). Table lower bounds: 0, 1, 4, 7, 11, 17, 22, 28, 34, 41, 48, 56, 64 knots.

Updated: September 2026

Example Scenarios

Inspect the example and its input basis, then substitute your own documented measurements or matched cases.

Mean wind speed: 20Wind-speed unit: kt

→ Beaufort 5: Fresh breeze

Common Mistakes to Avoid

Mixing observation and model inputs

Use the exact units, timestamp, level and measurement or model basis stated by the selected mode. A similar quantity from another instrument or product is not automatically interchangeable.

Treating an illustrative case as a measurement

Replace the example with your own sourced inputs. Retain missing values and method limits, and keep raw source data alongside a saved calculation.

FAQ

Convert wind to knots, round to the nearest whole knot for the published whole-knot table, then return Beaufort force 0–12. Display this rounding convention and the unrounded speed; do not add a force simply because the site is at sea.

Retain the station or profile identity, observation or issue/valid time, measurement units, quality flags, source and stated method. Missing values, trace precipitation and known zeros have different meanings.

Save weather case keeps an explicit local record. Copy MD includes current inputs and notes; Download CSV includes the current result breakdown. Keep portable copies separately and retain raw source data.

About Beaufort Wind Force and Unit Conversion

Convert wind to knots, round to the nearest whole knot for the published whole-knot table, then return Beaufort force 0–12. Display this rounding convention and the unrounded speed; do not add a force simply because the site is at sea.