ANCHOR SIZING GUIDE

When making sizing recommendations for a working anchor, we are generally referring to the needs of a cruising boat spending most of its time on anchor.

In doing so we try to envelope high sustained winds (50 kts) and assume poor holding conditions (low viscosity bottoms).

Some may think these recommendations to be too conservative especially when compared to sizing tables from other manufacturers.

However, companies often make claims of superior anchor efficiency, stating that their small anchor X will outperform a much heavier anchor from their competitors and often use sizing charts as a marketing tool to that end.

Often, we believe they recommend anchors and anchor systems that are dangerously undersized for their intended use.

Comparing surface area can be a good judge for potential holding capability.

Our anchor sizing recommendations are presented in the table below and divided in three categories:

Lunch anchor

is recommended for lighter use, expected winds under 30 knots

Working anchor

is recommended for winds under 50 knots

Storm anchor

is recommended for winds above 50 knots

These recommendations are made assuming the worst case scenario, a poor holding bottom and thus may seem conservative but we believe are accurate.

Please use the following guides to determine what size of anchor to use:

Anchor Sizing (Metric)

M1 Anchor Size (Metric)Lunch anchor for winds < 30 knotsCruising anchor for winds < 50 knotsStorm anchor for winds > 50 knotsBlade Surface Area (cm sq)
1 kg0-5 m
< 460 kg
160
3.5 kg5-6 m
< 1,300 kg
0-5 m
< 460 kg
0-3.6 m
< 360 kg
380
6 kg6-7.5 m
< 2,300 kg
5-6 m
< 1,400 kg
3.6-5 m
< 460 kg
570
8 kg7.5-9 m
< 5,000 kg
6-7.5 m
< 2,300 kg
5-6 m
< 1,400 kg
680
11.4 kg9-10.6 m
< 6.800 kg
7.5-9 m
< 5,000 kg
6-7.5 m
< 2,300 kg
800
15 kg10.6-12 m
< 9,090 kg
9-10.6 m
< 6,800 kg
7.5-9 m
< 5,000 kg
1,000
20 kg12-13 m
< 13,600 kg
10.6-12 m
< 9,090 kg
9-10.6 m
< 6,800 kg
1,260
25 kg13-13.5 m
< 23,000 kg
12-13 m
< 13,600 kg
10.6-12 m
< 9,090 kg
1,400
30 kg13.5-15.2 m
< 23,000 kg
13-13.5 m
< 18,200 kg
12-13 m
< 13,600 kg
1,640
39 kg15.2-18.2 m
< 27,000 kg
13.5-15.2 m
< 23,000 kg
13-13.5 m
< 18,200 kg
1,840
48 kg18.2-21.2 m
< 32,000 kg
15.2-21.2 m
< 27,000 kg
13.5-15.2 m
< 23,000 kg
2,160
57 kg21.2-24.2 m
< 45,500 kg
18.2-21.2 m
< 32,500 kg
15.2-18.2 m
< 23,000 kg
2,500
70 kg24.2-27.3 m
< 50,000 kg
21.2-24.2 m
< 45,500 kg
18.2-21.2 m
< 32,500 kg
3,190
80 kg27.3-30.3 m
< 59,000 kg
24.2-27.3 m
< 50,000 kg
21.2-24.2 m
< 45,500 kg
3,641
M1 Anchor Size (Imperial)Lunch anchor for winds < 30 knotsCruising anchor for winds < 50 knotsStorm anchor for winds > 50 knotsBlade Surface Area
(inches sq)
2.5 lbs0-16 ft
< 1,000 lbs
25
8 lbs16-20 ft
< 3,000 lbs
0-16 ft
< 1,000 lbs
0-12 ft
< 800 lbs
56
13 lbs20-25 ft
< 5,000 lbs
16-20 ft
< 3,000 lbs
12-16 ft
< 1,000 lbs
88
17 lbs25-30 ft
< 11,000 lbs
20-25 ft
< 5,000 lbs
16-20 ft
< 3,000 lbs
105
25 lbs30-35 ft
< 15,000 lbs
25-30 ft
< 11,000 lbs
20-25 ft
< 5,000 lbs
124
35 lbs35-39 ft
< 20,000 lbs
30-35 ft
< 15,000 lbs
25-30 ft
< 11,0000 lbs
155
45 lbs39-43 ft
< 30,000 lbs
35-39 ft
< 20,000 lbs
30-35 ft
< 15,000 lbs
195
55 lbs43-45 ft
< 50,000 lbs
39-43 ft
< 30,000 lbs
35-39 ft
< 20,000 lbs
217
65 lbs45-50 ft
< 50,000 lbs
43-45 ft
< 40,000 lbs
39-43 ft
< 30,000 lbs
254
85 lbs50-60 ft
< 60,000 lbs
45-50 ft
< 50,000 lbs
43-45 ft
< 40,000 lbs
285
105 lbs60-70 ft
< 70,000 lbs
50-60 ft
< 60,000 lbs
45-50 ft
< 50,000 lbs
335
125 lbs70-80 ft
< 100,000 lbs
60-70 ft
< 70,000 lbs
50-60 ft
< 60,000 lbs
387
155 lbs80-90 ft
< 110,000 lbs
70-80 ft
< 100,000 lbs
60-70 ft
< 70,000 lbs
494
175 lbs90-100 ft
< 130,000 lbs
80-90 ft
< 110,000 lbs
70-80 ft
< 100,000 lbs
564
M2 Anchor Size (Metric)Lunch anchor for winds < 30 knotsCruising anchor for winds < 50 knotsStorm anchor for winds > 50 knotsBlade Surface Area
3.5 kg5-6 m
< 1,300 kg
0-5 m
< 460 kg
0-3.6 m
< 360 kg
405
6 kg6-7.5 m
< 2,300 kg
5-6 m
< 1,400 kg
3.6-5 m
< 460 kg
532
8 kg7.5-9 m
< 5,000 kg
6-7.5 m
< 2,300 kg
5-6 m
< 1,400 kg
656
11.4 kg9-10.6 m
< 6.800 kg
7.5-9 m
< 5,000 kg
6-7.5 m
< 2,300 kg
815
15 kg10.6-12 m
< 9,090 kg
9-10.6 m
< 6,800 kg
7.5-9 m
< 5,000 kg
991
20 kg12-13 m
< 13,600 kg
10.6-12 m
< 9,090 kg
9-10.6 m
< 6,800 kg
1183
25 kg13-13.5 m
< 23,000 kg
12-13 m
< 13,600 kg
10.6-12 m
< 9,090 kg
1366
30 kg13.5-15.2 m
< 23,000 kg
13-13.5 m
< 18,200 kg
12-13 m
< 13,600 kg
1505
39 kg15.2-18.2 m
< 27,000 kg
13.5-15.2 m
< 23,000 kg
13-13.5 m
< 18,200 kg
1834
48 kg18.2-21.2 m
< 32,000 kg
15.2-21.2 m
< 27,000 kg
13.5-15.2 m
< 23,000 kg
2059
57 kg21.2-24.2 m
< 45,500 kg
18.2-21.2 m
< 32,500 kg
15.2-18.2 m
< 23,000 kg
2441
70 kg24.2-27.3 m
< 50,000 kg
21.2-24.2 m
< 45,500 kg
18.2-21.2 m
< 32,500 kg
2701
80 kg27.3-30.3 m
< 59,000 kg
24.2-27.3 m
< 50,000 kg
21.2-24.2 m
< 45,500 kg
3014
M2 Anchor Size (Imperial)Lunch anchor for winds < 30 knotsCruising anchor for winds < 50 knotsStorm anchor for winds > 50 knotsBlade Surface Area
(inches sq)
8 lbs16-20 ft
< 3,000 lbs
0-16 ft
< 1,000 lbs
0-12 ft
< 800 lbs
63
13 lbs20-25 ft
< 5,000 lbs
16-20 ft
< 3,000 lbs
12-16 ft
< 1,000 lbs
82
17 lbs25-30 ft
< 11,000 lbs
20-25 ft
< 5,000 lbs
16-20 ft
< 3,000 lbs
102
25 lbs30-35 ft
< 15,000 lbs
25-30 ft
< 11,000 lbs
20-25 ft
< 5,000 lbs
126
35 lbs35-39 ft
< 20,000 lbs
30-35 ft
< 15,000 lbs
25-30 ft
< 11,0000 lbs
154
45 lbs39-43 ft
< 30,000 lbs
35-39 ft
< 20,000 lbs
30-35 ft
< 15,000 lbs
183
55 lbs43-45 ft
< 50,000 lbs
39-43 ft
< 30,000 lbs
35-39 ft
< 20,000 lbs
212
65 lbs45-50 ft
< 50,000 lbs
43-45 ft
< 40,000 lbs
39-43 ft
< 30,000 lbs
233
85 lbs50-60 ft
< 60,000 lbs
45-50 ft
< 50,000 lbs
43-45 ft
< 40,000 lbs
284
105 lbs60-70 ft
< 70,000 lbs
50-60 ft
< 60,000 lbs
45-50 ft
< 50,000 lbs
319
125 lbs70-80 ft
< 100,000 lbs
60-70 ft
< 70,000 lbs
50-60 ft
< 60,000 lbs
378
155 lbs80-90 ft
< 110,000 lbs
70-80 ft
< 100,000 lbs
60-70 ft
< 70,000 lbs
419
175 lbs90-100 ft
< 130,000 lbs
80-90 ft
< 110,000 lbs
70-80 ft
< 100,000 lbs
467

Contact us

[email protected]

or call

+44 (0)7863 403462

or chat with us now bottom right!

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