Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Unit Converters
Wind Speed: Beaufort Scale to Knots and MPH
Lookup of typical knot midpoints per Beaufort force 0–12, then mph = kn × 1.15078.
Force 5 is a fresh breeze, about 19 knots / 22 mph. Force 8 is a gale. Force 12 is hurricane language. The original scale was sea state, not an anemometer. We use common midpoint knots.
Force
Force 5
19 kn
A representative midpoint, not the whole band.
- mph
- 21.9
- km/h
- 35.2
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Beaufort force
The “Beaufort force” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
Force 5 is a fresh breeze, about 19 knots / 22 mph. Force 8 is a gale. Force 12 is hurricane language. The original scale was sea state, not an anemometer. We use common midpoint knots. Lookup of typical knot midpoints per Beaufort force 0–12, then mph = kn × 1.15078. Example: Force 4 → ~13 kn. Force 8 → ~37 kn. Force 0 → calm.
Lookup of typical knot midpoints per Beaufort force 0–12, then mph = kn × 1.15078.
Example: Force 4 → ~13 kn. Force 8 → ~37 kn. Force 0 → calm.
When to use this Beaufort to Knots
Common use cases
- Force 5 is a fresh breeze, about 19 knots / 22 mph. Force 8 is a gale. Force 12 is hurricane language. The original scale was sea state, not an anemometer. We use common midpoint knots.
- Sanity-check with this case: Force 4 → ~13 kn. Force 8 → ~37 kn. Force 0 → calm.
- The relationship is: Lookup of typical knot midpoints per Beaufort force 0–12, then mph = kn × 1.15078.
Localized examples
- Unit Converters: the example on this page uses the same formula as the widget.
What you get
- Fields: Beaufort force
- Lookup of typical knot midpoints per Beaufort force 0–12, then mph = kn × 1.15078.
- Example on the page: Force 4 → ~13 kn. Force 8 → ~37 kn. Force 0 → calm.
How to Convert Beaufort to Knots Step-by-Step
- 1Enter Beaufort force. Use the values you have, not a catalog average, unless that is all you know.
- 2Lookup of typical knot midpoints per Beaufort force 0–12, then mph = kn × 1.15078.
- 3Worked case: Force 4 → ~13 kn. Force 8 → ~37 kn. Force 0 → calm.
- 4Check which dictionary the other person is using — US or UK, decimal or 1,024 — then trust the number.
Governing formula
Lookup of typical knot midpoints per Beaufort force 0–12, then mph = kn × 1.15078.
Force 4 → ~13 kn. Force 8 → ~37 kn. Force 0 → calm.
Example: set Beaufort force = 5, then read the result.
Variable definitions
- value
Beaufort force
The “Beaufort force” field. Default 5; typical range 0–12.
- The conversion (Lookup of typical knot midpoints per Beaufort force 0–12, then mph = kn × 1.15078.) does not pick US vs UK gallons, SI vs binary megabytes, or Mach at altitude for you. Read the footnote on the page.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
Each force is a band. We show a representative knot value, not the whole band.
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Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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