Join Date: Oct 2006
Location: on the boat - Chesapeake
Thanked 218 Times in 194 Posts
Rep Power: 10
Look up your boat length and displacement on the Rocna sizing chart - take the larger of the two and you should be set. Unlike most sizing charts, there is no need to go up a size from the recommended anchor. My boat (just under 41', just over 22000 lbs) has plenty of anchor with a Rocna 25.
Note that a "tonne" is a metric ton, 1000 kg or about the same as a long ton (2240 lbs).