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What Size Anchor Do I Need?

The Jimmy Green Anchor Size Comparison Chart is compiled from individual manufacturer recommendation.

Anchor Size Comparison Chart
< 6 metres LOA6 - 8 metres LOA8 - 10 metres LOA10 - 12 metres LOA12 - 14 metres LOA14 - 16 metres LOA16 - 18 metres LOA18 - 20 metres LOA
Anchor Type < 1 tonne 1 - 2.5 tonnes 1 - 2.5 tonnes 2.5 - 5 tonnes 2.5 - 5 tonnes 5 - 9 tonnes 5 - 9 tonnes 9 - 13 tonnes 9 - 13 tonnes 13 - 16 tonnes 13 - 16 tonnes 16 - 20 tonnes 16 - 20 tonnes 20 - 25 tonnes 20 - 25 tonnes 25 - 40 tonnes
Galvanised and Stainless SteelRocna 4kg 6kg 6/10kg 10kg 10kg 15kg 15/20kg 20/25kg 25kg 25/33kg 33kg 33kg 40kg 40kg 55kg 55kg
Vulcan 9kg 9kg 9/12kg 15kg 15/20kg 20/25kg 25kg 25/33kg 33kg 33kg 40kg 40kg 55kg 55kg
Mantus and Mantus MK 2 5.9kg 5.9/7.7kg 7.7kg 11.4kg 15.9kg 15.9/20.5kg 20.5kg 25kg 25kg 29.5kg 29.5/38.6kg 38.6kg 38.6/47.7kg 47.7kg 56.8kg 70kg
Spade Galvanised and S/S 6kg 6/10kg 10kg 10/15kg 15kg 15/20kg 15/20kg 20kg 20kg 20/25kg 25kg 25kg 30kg 30/37kg 37/44kg 44/55kg
UltraMarine
Ultra
5kg 5/8kg 8kg 8/12kg 12kg 12/16kg 16kg 21kg 21kg 27kg 27/35kg 35kg 35/45kg 45kg 45/60kg 60kg
Lewmar Epsilon 4kg 4kg 6kg 6kg 10kg 10kg 16kg 16kg 20kg 20kg 25kg 25kg 32kg 32kg 40kg 40kg/50kg
Lewmar Delta 4kg 6kg 6/10kg 10kg 10kg 10/16kg 16kg 16/20kg 20kg 25kg 32kg 32kg 40kg 40kg 50kg 50/63kg
Lewmar Claw 5kg 5kg 5/7.5kg 7.5kg 10kg 10/15kg 20kg 20kg 30kg 30kg
Plastimo Britany 6kg 6/8kg 8kg 10kg 12kg 14kg 16kg 16/20kg 20kg 20kg
< 6 metres LOA6 - 8 metres LOA8 - 10 metres LOA10 - 12 metres LOA12 - 14 metres LOA14 - 16 metres LOA16 - 18 metres LOA18 - 20 metres LOA
Anchor Type < 1 tonne 1 - 2.5 tonnes 1 - 2.5 tonnes 2.5 - 5 tonnes 2.5 - 5 tonnes 5 - 9 tonnes 5 - 9 tonnes 9 - 13 tonnes 9 - 13 tonnes 13 - 16 tonnes 13 - 16 tonnes 16 - 20 tonnes 16 - 20 tonnes 20 - 25 tonnes 20 - 25 tonnes 25 - 40 tonnes
AluminiumFortress FX7 FX7 FX7/FX11 FX7/FX11 FX11 FX11 FX16 FX16 FX23 FX23 FX37 FX37 FX55 FX55 FX85 FX85
Guardian G7 G7 G11 G11 G16 G16 G23 G23 G37 G37
Spade Aluminium A40 A40 A60 A60 A80 A80 A100 A100 A140 A140 A140 A140 A140 A140 A200 A200
Lewmar LFX LFX4 LFX4 LFX4 LFX4 LFX7 LFX7 LFX10 LFX10 LFX15 LFX15 LFX21 LFX21

Rex Francis has set the Anchor Right parameters for the Sarca Excel in a slightly different format which is best analysed by interpreting the information for comparison with the other anchor designs.

SARCA Excel Parameters - Length and Displacement
Anchor Right - If your boat is over the limit in either column, it is advisable to upgrade to the next size.
Upgrading one size either for a multihull, or for long-term anchor dependent cruising would also be considered good practice.

Sarca Excel Size Guide by Yacht Length Overall and Displacement (weight)
Yacht Length Overall< 5 metres LOA5 - 7 metres LOA7 - 10 metres LOA10 - 12 metres LOA12 - 15 metres LOA15 - 17 metres LOA17 - 19 metres LOA19 - 21 metres LOA21 - 23 metres LOA23 - 25 metres LOA25 - 27 metres LOA
Weight< 1.2 tonnes1.2 - 2.8 tonnes2.8 - 3.5 tonnes3.5  - 7 tonnes7 -  15 tonnes15 - 21 tonnes21 - 24 tonnes24 - 28 tonnes28 - 32 tonnes32 - 36 tonnes36 - 42 tonnes
Sarca Excel Weight 7.5kg 9.5kg 12.5kg 16kg 22kg 30kg 36kg 40kg 50kg 55kg 63kg
Sarca Excel Size #1 #2 #3 #4 #5 #6 #7 #8 #9 #11 #13

Most anchor manufacturers publish a recommended weight of anchor by either the length overall or a combination of length, displacement and windage.

Some top manufacturers also include weather conditions and/or distinguish between monohulls and multihulls.

The top manufacturers are generally conservative and specify more criteria to help you make your selection.

The authority of each individual manufacturer recommendation may be judged by several factors: reputation, personal experience, research, the number of relevant factors that are taken into account, and the amount of detailed information that they publish on the subject.

The Jimmy Green Anchor Size Chart collates the recommended sizing for all the anchors that we offer on our website and highlights how similar the recommendations are.

Interpretation is still required for e.g. multihulls, high windage profile and extreme weather

Anchor Sizing Parameters by Manufacturer

Below we explain in more detail how the data for each individual anchor is presented and how it is collated into the Comparison Table above.

Galvanised and Stainless Steel Anchors

Rocna and Vulcan, Galvanised and Stainless Steel - Length and Displacement

Rocna/Vulcan recommend an anchor one size larger than indicated in their guide for multihulls

Quote from their Fitment Guide - ”our anchor sizing recommendations are intended to provide an anchor adequate for use in most all conditions. We base our calculations on 50 knots of wind, associated surge, and poor holding bottoms”

Mantus Mark 1 and 2 – Length, Displacement and Wind Speed

Mantus Quote - “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 knots) and assume poor holding conditions (low viscosity bottoms)”

Mantus publish a chart in three categories – “Lunch Anchor category is recommended for lighter use, expected winds under 30 knots, working anchor for winds under 50 knots and finally, storm anchor recommendations are intended for winds above 50 knots”

N.B. The Jimmy Green Comparison Table is derived from the Mantus middle category

Spade Galvanised and Stainless Steel – Length and Displacement

Spade recommend an anchor one size larger than indicated in their guide for multihulls

UltraMarine Stainless Steel – The UltraMarine Anchor Size Guide takes  multiple factors into consideration, Their comprehensive approach includes criteria on Length, Displacement, Mono/Multihull and Windage Profile.

Lewmar Epsilon, Delta and Claw – Length only

Lewmar guidelines are illustrated in a colour shaded range by length only, so you need to make a judgement regarding displacement i.e. light, average, or heavy compared with similar length yachts. If the answer is heavy, it is advisable to upgrade to the next size.

Plastimo Britany – Length only

Plastimo Quote – “Anchor weight per boat length is only given as an indication. However, your anchor selection should also recognise the specific construction of your vessel”

Aluminium Anchors

The concept of using a lightweight anchor goes against the traditional belief that weight is one of the most important factors in holding power.

Fortress Quote – “Fortress design does not depend upon weight to provide world class performance”

However, the most popular application for aluminium anchors is as a convenient, high holding power secondary or kedge anchor.

Fortress/Guardian – Length only

Fortress Quote – “Boat anchor size recommendations are for boats of average windage and proportions in 30 knots of wind, average bottom conditions, and moderate protection from open seas. Remember that the loads in 42 knots of wind are twice as much as in 30 knots”

Spade Aluminium – Length and Displacement

Spade recommend an anchor one size larger than indicated in their guide for multihulls.

Spade Quote – “Aluminium version not recommended for use as primary anchor”

Lewmar LFX – Length only

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