how to calculate how much trunk space?

I need to know how to calculate how much space I have in my trunk. isnt there a formula or something for this?

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I'm certified now and still ain't got no job. (I think I need help)

Fill it with packing peanuts! LOL

Actually, that is a very good way to figure the volume, but it's a bit messy. Trashbags filled loosely with them is a possible solution to it.

Once you know how many peanuts will fit, remove them, and put them into a box of known volume, multiply that volume by how many times you fill it. There's your trunk volume.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

I would simply use a tape measure.  Break the space up into bite-sized chunks.  It becomes a matter of breaking up the space into zones, and each zone will have a cubic size.  A zone can go all the way from top to bottom, side to side or it can be just a little nook in one side.  But they will all add up to comprise the total airspace.

Rounded areas?  While seemingly difficult to measure, they are not if you have zoned off the area.  If a rounded side comprises part of a zone, find the center of that radius and measure at that point.  You don't need to know the widest point and the narrowest point, just the middle ground. 

Back seat tilt back into the trunk space?  That is a zone, from the top of the seat straight down.  Use the wedge calculator found here to find cu ft of the area.  Rectangle calculator on that page can come in handy as well.  Thickness in the calculators would of course be "0" because you are just multiplying W X L X H.  Or just use a calculator.

Always draw a diagram first, put in the measurements, and then calculate.  Your diagram will show the zones of the trunk space and things will be kept reasonably simple.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

I think the packing peanuts'd be easier

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

You're nuts.  That's a lot of work, those peanuts.  And if the wind catches them they're all over the yard.

Better to use rocks.  You can get a good workout at the same time, and when you're all finished you can use them in your landscaping. 

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Yeah, that's a good one!! I almost choked on my water!

Hey, or you could get the mattress from a waterbed, stuff it in your trunk, then fill 'er up. Measure the water afterwards.

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

Rocks... Damn, THAT'S funny...

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."