Wind and Marine Speed Converter

Convert wind and marine speed between m/s, km/h, mph, knots, ft/s, and Beaufort force with a table-led reference sheet.

Wind and marine speed

Compare forecast, sailing, and Beaufort references on one sheet

Convert the same moving-air or surface-speed reading into m/s, km/h, mph, knots, feet per second, and the Beaufort scale so marine, weather, and navigation references stay aligned.

Scope note

Beaufort output is an approximation anchored to the standard force bands. It is useful for forecast reading and rule-of-thumb planning, but it does not replace an official marine forecast or onboard observations.

Enter a valid wind value Enter a wind or marine speed to compare weather, boating, and navigation units.

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Wind and Marine Speed

Wind and marine speed converter: Beaufort, knots, m/s, km/h, mph, and forecast context explained

A wind and marine speed converter helps when the same forecast or observation has to move between weather services, boating references, and navigation notes. One source may use knots, another may use metres per second, and a rule-of-thumb briefing may still frame the same conditions in Beaufort force.

Why weather and marine references use different speed units

Metres per second is common in meteorology and technical tables. Kilometres per hour and miles per hour are common in public-facing forecasts. Knots remain standard for marine and aviation navigation because they tie directly to nautical miles per hour. That means the same wind can be described in three or four different ways before Beaufort terminology is even added.

A useful converter keeps those labels on one sheet instead of forcing you to jump between weather and navigation contexts. That is particularly helpful when you are checking forecasts, harbour conditions, or small-craft planning notes side by side.

What the Beaufort scale is actually doing

The Beaufort scale is not a separate physical type of speed. It is a banded classification system that maps observed or measured wind into force categories such as light breeze, fresh breeze, gale, or storm. That is why the Beaufort row on this page is descriptive as well as numeric.

Because Beaufort force works in ranges rather than infinitely precise decimal values, the conversion back from Beaufort to linear units is approximate. The page uses the standard band midpoint for the reverse conversion so the result sheet stays practical without pretending to a false level of precision.

1 kn = 1.852 km/h

Exact nautical-speed relationship used whenever forecast knots need to be read as road-speed units.

1 m/s = 3.6 km/h

Core SI relationship used to translate weather-service readings into public forecast units.

When to rely on the reference sheet

The result sheet is useful for forecast reading, route planning, and cross-checking marine or aviation references. It is not a replacement for a live marine forecast, harbour notice, or onboard observation. Wind direction, gust spread, sea state, fetch, and local geography all matter in the real world.

Use the highlighted Beaufort row as a plain-language context layer. It helps translate a decimal speed into a more familiar condition band without losing the exact unit conversions underneath.

Frequently asked questions

What is one knot in km/h or mph?

One knot equals exactly 1.852 km/h and about 1.15078 mph. A 20-knot wind is therefore 37.04 km/h or 23.02 mph.

 Is Beaufort force a precise wind speed?

Not exactly. Beaufort force is a range-based classification. Each force corresponds to a wind-speed band, so converting back to m/s, km/h, or knots is approximate rather than exact.

 Why are marine forecasts often given in knots?

Knots are nautical miles per hour, which fits marine and aviation navigation practice. Using knots keeps speed and distance references aligned with nautical charts and route-planning conventions.

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