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Conversion Tables:
Convert is a nice conversion program that will convert knots to mph, pounds to stones, etc., etc. 
It's a free download and has a five star rating from ZDnet.  Check out the latest version at Convert.
Common wind speeds in mph converted to knots:
MPH Knots MPH Knots MPH Knots
5 4 25 22 45 39
10 9 30 26 50 43
15 13 35 30 55 48
20 17 40 35 60 52
Windspeed table adapted from the web:
The Beaufort scale was developed in 1805 by Admiral Beaufort to describe wind force on the open sea.
Bft MPH Knots Name Sea Description
3
8-12 6.21-10.53 Gentle Large wavelets; crests begin to break, Breeze scattered whitecaps
4
13-18 10.53-15.39 Moderate Small waves 0.5 - 1.25 meters high, Breeze becoming longer; numerous whitecaps
5
19-24 15.39-20.79 Fresh Moderate waves of 1.25 - 2.5 m. Breeze taking longer form; many whitecaps; some spray
6
25-31 20.79-26.73 Strong Larger waves 2.5 - 4 meters forming; Breeze whitecaps everywhere, more spray
7
32-38 26.73-33.21 Near gale Sea heaps up, waves 4 - 6 m; Gale white foam from breaking waves begins to be blown in streaks
8
39-46 33.21-40.23 Gale Moderately high (4 - 6 m) waves of greater length; edges of crests begin to break into spindrift; foam is blown in well-marked streaks
9
47-54 40.23-47.79 Strong gale High waves (6 m); sea begins Gale to roll; dense streaks of foam; spray may reduce visibility
10 55-63 47.79-55.35 Storm Very high waves (6 - 9 m) with overhanging crests; sea takes a white appearance as foam is blown in very dense streaks; rolling is heavy and visibility is reduced
11 64-72 55.35-63.44 Violent storm Exceptionally high (9-14 m) waves; Storm sea covered with white foam patches; visibility still more reduced
Common board lenghts in cm converted to approximate ft & in:
cm
ft-in
cm
ft-in
cm
ft-in
cm
ft-in
244
8-0
262
8-7
277
9-1
295
9-8
245
8-1
264
8-8
279
9-2
298
9-9
250
8-2
267
8-9
282
9-3
300
9-10
251
8-3
269
8-10
284
9-4
310
10-2
254
8-4
272
8-11
288
9-5
320
10-6
260
8-5
274
9-0
290
9-6
330
10-10
Pounds to kilograms:
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
12
5.4
16
7.3
20
9.1
24
10.9
28
12.7
13
5.9
17
7.7
21
9.5
25
11.3
29
13.2
14
6.4
18
8.2
22
10.0
26
11.8
30
13.6
15
6.8
19
8.6
23
10.4
27
12.3
31
14.1

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