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I tend to agree with a post by Stuthepirate (Posted 20/11/2012) for a general guide to calculate the volume of a board. He suggested length x width x height then remove 30% however I would remove 40%. I tested his theory on a couple of my boards where I new the volume of each and removing 40% seemed to be a little more accurate. Either way it's really just a guide and the only way to accurately measure capacity is displacement, submerge the board in water and measure how much the water rises.
Calculation: length x height x width divide by 1000 x .6 (for 40%) = approx. volume
Calculation: length x height x width divide by 1000 x .7 (for 30%) = approx. volume
^^^ not the first bit cos it displaces it's own volume whether it is made of steel or foam or wood? so the board's weight is irrelevant.............?
Or did i get that bit of yr10 wrong 
I agree, Technically Volume is Volume regardless of how heavy board is. But, in windsurfing the number of litres a board is supposed to represent how floaty the board is. So if a board is 120 Lts and weighs 10Kg wouldn't it float someone 90Kg the same as a 120Lt board that is 5KG floats a 95Kg bloke?
l had this problem once both these boards in photo are of similar size but the grey one (left side) is quoted as 123 litres where as the other one (right side) is quoted as 109 litres.when l use these two boards with same rig the same day they both feel sink wise the same.could manufacturers got it wrong.the rrd is European (right) the centurion (robbie radis design) australian.
Volume is volume. It has nothing to do with weight.
We need to get Barn onto this one!
The more types of boards you include in the analysis, the more general (with the associated error) that your singular formula will become.
For example, I just looked up the JP Australia website for details of three classes of boards. These were modelled (using multiple linear regression) with very accurate results. However, when you analyse all three groups combined, the results become less accurate. If you extend the modelling to all boards (even within a particular style of board, say, wave, freestyle, slalom) the results will become even more varied (noisy).
Just my 2 cents worth 
Another method is to read the label with the boards specs that the manufacturer printed onto the board.
^^ makes sense
and Justin I was just being silly as I hate the term virtual volume, but yes width contributes to more stability and more uplift when starting to move forward so boards can feel bigger. But no it is not harder to sink the wide board
I've always wanted to know just what the volume if my 79 litre board really was. Being a Land Surveyor I thought I'd accurately measure the board with an electronic theodolite. I took "shots" all over the top ,bottom & sides of the board which was held in a frame. I fed the 3D data into a volume calculating software program and guess what ! - the volume it punched out was 79.0 litres .
the easiest foolproof way is probably the Archimedes/Eureka method
get a waterproof crate where board fits in
put in enough water to be able to push board under water
volume before ?
volume after pushing board under water?
delta is your board volume ...
most difficult part?
finding a big enough water proof crate
VOLUME has NOTHING to do with weight
a bucket full of water weighs more than the same bucket full of crap
volume on earth is the same volume in space or on the moon
the weight changes
besides, with freemove and freeformula, isn't width now more important than volume ?? kidding ...
actually in Canada
you would have a bucket of ice
pool is ice too
so, air pressure and temperature are factors ??
up the mountain, sea level ,etc ??
btw, with my 160 liter board... no way i am lifting 160 kilos !!!
)
)
For the method of sinking the board and weighing the amount of water used to sink it, yes you need to take the weight of the board into account.
Volume is still just volume though. The weight of the object has nothing to do with volume.
Interesting chat
1 Volume of your board is critical and something as purchases we all need to know ,this needs to be accurately measured in the same way by all manufactures. SURELY no names
so how does one notices variations between two boards of the same literage 
2 The distribution of the volume / this is the most critical ie (the Shape) and weight balance........for overall balance and stability for floating / plodding / planning /speeding / maneuverability.........excluding your / fin size / weight of the rigg
3 I use custom boards , and the volume / shape is refined by/ from making and working with your shaper this often takes a couple of boards to get perfected, but once you got something that you can use with a 5.7 to 4.2 in 1 to 2 ft of 2 to 10 ft in 10knts to 35knots you know the volume and shape is perfect for you as long as you not putting on weight and using the different style of riggs i.e draft wise ........talking cam sails to wave sails.
So how many liters is my new custom that is sitting in the SSD rack for me to collect .........dont know and dont really care ive got a fair idea / because i know its a copy of my last board and it was perfect couple of very very small variations.
But you have got me thinking what is its exact volume ................
I will weigh my self / i know im approx 102 kg and will float it in the pool and just sit and stand on it before i kit it up ........yer
if it just floats or just sinks a bit ill be on the money for the volume
im getting given me self a headache ///// froth forth froth
Ps Some one a couple of post back had some laser thing that measured it up .........where do i find that on my fkn i phone
I believe the topic has become more and more convoluted. The original question was how to measure the volume of an object. In this case it is a board.
Lets just forget about the board that the board has odd lumps and bumps, and imagine it is a flat piece of blank with say 100 litres. If the foam is very dense, say like cast iron, it will sink as the weight of the blank will be heavier than the total weight of the water/fluid displaced. However, if the weight of the blank is just the same as the displaced water/fluid, it will just barely float. This is the Archimedes Principle.
Now if you are to hollow out the blank, it will float easily as its weight is now much lower. To put it in a nut-sheel, it is about how much water is displaced, and the net weight of the blank.
Now if you are to stand on the now hollowed out blank that was floating easily before, it may or may not float, depending on how heavy you are.
If you just want to know what is the volume of the board, then it is simply the net volume of "pure" water displaced. However, if you want to know how big a board needs to be to carry certain weight, then obviously, the "combined" weight of the board and the rider need to be accounted for.
What about you mark boxes(rectangles) fully across the board every 100mm down the length of the board and do the length x width x thickness for each box as all boards will have the wide point tapering to varying narrow points depending on the template of the board,I tried this out on my shortboard and came within .03lt from what is stated on the blank.Doing it overall measurements seems to discount template shape of board and how far they carried the thickness through the length of the board.
It seems some people are getting confused between volume and flotation. Forget boards for a little while. You have 2 cubes 1metre x 1metre x 1metre.
They don't have to do anything they're just cubes. 1 is made of polystyrene and 1 is made of lead.
The volume of both is 1000 litres.
