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24-03-2022, 07:44
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#1
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Registered User
Join Date: Aug 2021
Boat: Formosa 41
Posts: 92
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What is a Ton in Boat Weight
Ok
What is the weight of your boat
I see it used in both long tons and short tons
My boat is recorded on the documentation as 13 tons,
but thats 26,000 lbs, is that wrong
Did you use long or short tons on the documentation?
A documentation person did that for me decades ago
Then an article turns around and says my keel is 9 tons alone
Well that is short tons
Some big boats have recorded weights in tons that are
a few tons more than my keel weight
Is that correct?
I'm getting confused
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24-03-2022, 07:58
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#2
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Moderator

Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 5,438
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Re: What is a Ton in Boat Weight
A short ton is 2,000 pounds
A long ton is 1,000 kilograms, or about 2,200 pounds.
You have a monohull with substantial ballast. I'm still impressed that it's 18,000 pounds in a 41 ft boat. That seems high, but it's been awhile since I sailed a 40' Rhodes with 6,000 pounds of ballast. Maybe design has changed.
OK, but which was being used when someone says "tons?" Are they otherwise talking American, as in feet, or are they talking like the civilized world, as in meters?
__________________
Never let anything mechanical know that you are in a hurry.
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24-03-2022, 08:08
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#3
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Senior Cruiser

Join Date: Dec 2008
Location: Noank, Ct. USA
Boat: Cape Dory 31
Posts: 2,852
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Re: What is a Ton in Boat Weight
Quote:
Originally Posted by toerail
Ok
What is the weight of your boat
I see it used in both long tons and short tons
My boat is recorded on the documentation as 13 tons,
but thats 26,000 lbs, is that wrong
Did you use long or short tons on the documentation?
A documentation person did that for me decades ago
Then an article turns around and says my keel is 9 tons alone
Well that is short tons
Some big boats have recorded weights in tons that are
a few tons more than my keel weight
Is that correct?
I'm getting confused
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It is a measurement of internal volume, nothing to do with the weight of the vessel. When you say “the documentation” I presume you are referring to your USCG document.
https://www.dco.uscg.mil/Our-Organiz...tation-Center/
https://en.wikipedia.org/wiki/Gross_tonnage
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24-03-2022, 08:13
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#4
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Moderator

Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 5,438
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Re: What is a Ton in Boat Weight
Point well taken Reading it again, "documentation" stands out. But the keel?
__________________
Never let anything mechanical know that you are in a hurry.
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24-03-2022, 08:18
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#5
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Registered User
Join Date: Jul 2015
Boat: Bruce Bingham Christina 49
Posts: 2,734
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Re: What is a Ton in Boat Weight
This link gives a good explanation of the various ship tonnage terms.
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24-03-2022, 08:22
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#6
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Moderator
Join Date: Feb 2010
Location: La Ciudad de la Misión Didacus de Alcalá en Alta California, Virreinato de Nueva España
Boat: Cal 20
Posts: 17,024
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Re: What is a Ton in Boat Weight
For the purposes of calculating “Tonnage” a ton is 100 cubic feet.
I believe this goes back to tuns of wine.
__________________
Num Me Vexo?
For all of your celestial navigation questions: http: fer3.com
A house is but a boat so poorly built and so firmly run aground no one would think to try and refloat it.
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24-03-2022, 08:32
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#7
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Registered User
Join Date: Aug 2021
Boat: Formosa 41
Posts: 92
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Re: What is a Ton in Boat Weight
I didnt even think of metric tons
Now I am more confused
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24-03-2022, 08:34
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#8
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Registered User
Join Date: Aug 2021
Boat: Formosa 41
Posts: 92
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Re: What is a Ton in Boat Weight
Yes and gross tonnage is volume as in how much cargo it can carry
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24-03-2022, 08:37
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#9
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Registered User
Join Date: Jun 2019
Location: Rochester, NY
Boat: Chris Craft 381 Catalina
Posts: 3,708
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Re: What is a Ton in Boat Weight
The tonnage listed on USCG documentation is completely unrelated to weight. As an example, fully loaded, my boat weighs about 27,000 lbs. However, if I use the simplified method to calculate its tonnage for documentation purposes, it comes in at 25 gross tons, 20 net tons.
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24-03-2022, 09:30
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#10
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Registered User
Join Date: Aug 2021
Boat: Formosa 41
Posts: 92
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Re: What is a Ton in Boat Weight
Thanks
I was wrong again
net tons is volume cargo
gross tons is the boat measurements in size
Then there is displacement tonnage
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24-03-2022, 10:12
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#11
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Registered User
Join Date: Aug 2021
Boat: Formosa 41
Posts: 92
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Re: What is a Ton in Boat Weight
Thanks I just downloaded the USCG simplified calculation method and got 29.5 gross tons
My documentation isnt correct
And it cost me 600.00 by a professional
And they put 13 gross and 12 net
I dont know what they did
And I dont need these for ais or mmsi number is another thing I was looking at
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24-03-2022, 10:14
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#12
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Registered User
Join Date: Aug 2021
Boat: Formosa 41
Posts: 92
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Re: What is a Ton in Boat Weight
Now when I see tons in an advertisement for sale or in a magazine article I will have no idea what they mean
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24-03-2022, 10:19
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#13
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Registered User
Join Date: Jun 2019
Location: Rochester, NY
Boat: Chris Craft 381 Catalina
Posts: 3,708
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Re: What is a Ton in Boat Weight
Quote:
Originally Posted by toerail
Now when I see tons in an advertisement for sale or in a magazine article I will have no idea what they mean
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It depends on context. If they specify displacement, then you at least know it's weight. But it's still a question of which tons (long, short or metric) and whether that's dry weight or loaded weight.
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24-03-2022, 10:28
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#14
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Registered User
Join Date: Aug 2021
Boat: Formosa 41
Posts: 92
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Re: What is a Ton in Boat Weight
Then there is lightweight displacement tonnage
Then there is deadweight displacement tonnage
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24-03-2022, 10:30
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#15
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Registered User
Join Date: Oct 2014
Location: Grand Manan,N.B.,Canada N44.40 W66.50
Boat: Mascot 28 pilothouse motorsailer 28ft
Posts: 2,514
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Re: What is a Ton in Boat Weight
__________________
 My personal experience & humble opinions-feel free to ignore both
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