Convert miles per hour to Beaufort

1 mph=0.447Bft

Use the converter below to change any miles per hour value into Beaufort instantly — with formula, conversion table, and real-world examples.

You have

Equals

0.65881

Conversion formula

Forward

Bft = (m/s ÷ 0.836)^(1/1.5)

The Beaufort scale uses a non-linear power relationship with wind speed.

About both units

From

Mile per Hour

mph

Miles per hour (mph) is the standard road-speed unit in the US, UK and a few other countries. US highways typically 65–75 mph; UK motorways 70 mph. US weather reports wind speed in mph, while meteorologists also use knots.

Real-world: US interstate: 70 mph typical. UK motorway: 70 mph limit. Cycling pro speed: 25 mph. Tornado winds: 110+ mph.

Read full mile per hour reference →

Beaufort Scale

Bft

The Beaufort scale is an empirical wind-force scale from 0 (calm) to 12 (hurricane). Created by Francis Beaufort in 1805, it correlates wind force with observed effects on sea or land. Force 8 (34–40 knots) is a gale; force 12 is above 64 knots.

Real-world: Force 5 (fresh breeze): 17–21 knots, white-caps form. Force 8 (gale): 34–40 knots. Force 12: 64+ knots.

Read full beaufort scale reference →

Mile per Hour to Beaufort Scale conversion table

Common miles per hour to Beaufort values for quick reference.

Mile per Hour (mph)	Beaufort Scale (Bft)
1 mph	0.447 Bft
5 mph	2.2352 Bft
10 mph	4.4704 Bft
25 mph	11.176 Bft
50 mph	22.352 Bft
100 mph	44.704 Bft
150 mph	67.056 Bft
200 mph	89.408 Bft
300 mph	134.112 Bft
500 mph	223.52 Bft

Tips & common mistakes

Quick tips

1 mph = 1.609 km/h = 0.447 m/s.
Quick convert: mph × 1.6 = km/h.
UK speeds posted in mph on road signs despite general metrication.

Avoid these

Reading a UK road sign "50" as km/h — it's mph (= 80 km/h).
Converting mph to km/h by multiplying by 1.5 instead of 1.609 — 7% error.
Assuming "mph" and "MPH" differ — capitalisation does not matter.

Frequently asked questions

How many Beaufort in a mile per hour?

One mile per hour equals 0.447 Beaufort.

How do I convert miles per hour to Beaufort?

Multiply the mile per hour value by 0.447 to get the equivalent in Beaufort.

What is 100 miles per hour in Beaufort?

100 miles per hour equals 44.704 Beaufort.

Is a mile per hour bigger than a beaufort scale?

No. 1 mile per hour equals 0.447 Beaufort, so one mile per hour is smaller.

How to convert miles per hour to Beaufort without a calculator?

Multiply by 0.45 for a quick estimate; use a calculator for precise results.

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