I am building a custom setup for my mates holden calibra, i need to find out how to mesure the litres of the box, i need a box that is 28.3 litres


the top pic is of the whole boot install and the bottom one is the shape of each box

You need to measure the litres of the box? So the box is already built? If so, fill it with bean bag balls or something and measure with a 1L jug how many litres fit in it.

If not, you will need to dissect the box shape into basic shapes and calculate from there... See attached.

kewl thanks mate n how do u mesure the litres of a triangle

read a maths textbook, or look on the net...inititive

Measure the 2 sides that make the right angle, multiply them and then divide by 2. If it's not a right angle triangle, then divide it up so you make 2 right angle triangles, and do the same measuring for each.

Why not use the CAA enclosure calculator? It works in feet and inches but put the metric dimensions in then multiply the result by 12x12x12.

Further explaination
Measure the box sizes in mm and convert to decametres. ie 385mm is 3.85 decametres. The computer "thinks" you have put in inches and puts the answer out in cubic feet. multipying by 12^3 converts it back to cubic inches but it's actually cubic decametres. One cubic decametre is one litre.

Converting all your measurements to inches then converting the answer back to metric is a lot more work and is not as accurate in the end.

Hope that helps some

Don't make it more complicated than it needs to be. It's pretty simple to work out volume in litres (unlike primitive cubic ft), measure in cms, width x height x depth = cc (cubic cms). 1000cc = 1 litre, so just dive your answer by 1000 to get litres.

If you try doing what I was saying you will realise that it is a lot less complicated than it sounds. If you don't like the CAA enclosure calculator then do it the way you are saying but use decametres. One cubic decametre is a Litre. When you have the results you don't have to do any converting from cubic cm to Litres

You don't need to do any converting, just put a decimal point in after the first 2 digits of the result.
And a decametre is 10 metres, do you mean decimetre(10cm)?

You're right it's decimetres. I was reading Encyclopedia Britannica the other day and I could swear it said decametres but I just checked to see if it was a typo but nah, my eyes are funny.

Moving the decimal point is all you're doing, yeah, but I find it easier to do it right from the start. But it's a different way of thinking. If you take 359mm and put it in your calculator as 3.59 you could say you're moving the decimal point or you could say you're using decimetres.

It's like what you said. This is the metric system, it's so simple

This is another site to add to the tool box . It comes in quite handy when trying to determine dimensions of triangles:

Click here.

I like that Fhrx thanks. I'm saving it into my computer and I'll find all sorts of uses for it. By the way notice how it says "units" not cm or mm or inches? That's because it will calculate whatever you're working with, be it mm cm or inches or dogs biscuits and the CAA enclosure calculator will do the same, like any calculator it just crunches numbers.

Now I don't want to keep harping-on about this but when I said "Moving the decimal point is all you're doing...but it's a different way of thinking" More to the point is that one cubic decimetre is what a litre is. It was first determined in 1799 in France that a cubic decimetre of water will be a kilogram in mass and be one litre in volume. So it makes sense to use decimetres because it's the unit of measure when calculating volume in metric.

The trouble is most people only ever use mm cm or metres so decimetres are a bit alien and it can be confusing. But once you've adapted it's a lot easier to work with

The way I use the CAA enclosure calculator is to disregard the "inches" and "cubic feet" and just consider them to be "units" I'll start a new thread giving examples of how I use it

In mathematics, if you're building a computing engine of some type or another you always try and make it as non specific (non metric / imperial) as possible, hence the units.