View Full Version : calculating a slanted box

95Prober

06-08-2005, 03:49 PM

well, my sealed box is slanted and i want to measure the interior. now, how do measure the slant on the back of the box? the rest of the box is all at 90 degree angles. i measured from the very top to the top at the back of the box, the middle and bottom the same way. as you go from top to bottom, the box gets longer in depth.

thx

hawk45

06-08-2005, 04:03 PM

Go here: http://www.the12volt.com/caraudio/boxcalcs.asp

They have a slated box volume calculator...

AzGrower

06-08-2005, 04:03 PM

Take the opposite side's length, add it to to the slant length and divide by 2 to get a rough estimate. So for instance:

Slant side: 8"

Opoosite non slant side: 10"

8+10= 18/2 =9" use this as your measurement.

cu foott = 1728 cu inches

95Prober

06-08-2005, 04:08 PM

Thx!!!!!!

95Prober

06-08-2005, 04:32 PM

but its strange??? on bcae1.com and their calculator i get = 0.686 total volume

and with 12volt.com calculator, i get 0.73372

why? i enter these numbers:

thickness .75 < but dont need to use this number since i have the exact INSIDE dimensions

INSIDE:

width 10.5"

height 10.5"

depth 1 at top > 9.5"

depth 1 at bottom > 12"

now the bcae1.com calculator has the picture of the same way mine is designed, with 2 DEPTH measurements.

but 12volt.com doesnt have 2 DEPTH measuremnets, it says 2 HEIGHT measuremnets. i thought it would work out the same, just that one box is flipped around then the one on the bcae1.com site. its weird

95Prober

06-09-2005, 10:36 AM

can anyone guess whats wrong?

djjdnap

06-09-2005, 10:42 AM

nothing, onlince calculators don't always use the same formulas.

So just pick one and stick wt it I say.

95Prober

06-09-2005, 11:08 AM

both if i get 2 different answers, how can i know which is more accurate?

djjdnap

06-09-2005, 11:09 AM

find out the formula and do it ur self.

95Prober

06-09-2005, 11:57 AM

well thats what the calculator are there for. its just its strange getting 2 different answers when the calculator in both sites look the same

put ZERO in for wood thickness and use the internal dimensions :)

djman37

06-09-2005, 12:13 PM

a triangle is half a rectangle.

measure the two right angle sides to make a rectangle and divide by 2.

use INTERNAL distances to get INTERNAL volume though!

TPABlazer

06-09-2005, 04:27 PM

a triangle is half a rectangle.

measure the two right angle sides to make a rectangle and divide by 2.

use INTERNAL distances to get INTERNAL volume though!

Semantics!!! if its an equilatteral triangle its going to be a square!! or a rhombus if you wanna get crazy... or hell paralleogram fits the bill too!

djman37

06-09-2005, 04:39 PM

got me. I should say, in his case. Use the calculator to find the volume of a box that is side 2 tall by side 3 minus side 1 wide by side 5 deep, then divide by 2 for the volume of the 'triangle part.' Add that to the volume of a box that is side 1 by side 2 by side 5 to get total.

1

___ ---------------

| \ | |

2 | \ 4 2| |

|------- ---------------

3 5

*edit* great. that looks like @ss when i post it!!!

snebes

06-09-2005, 06:11 PM

(1/2) base * height * depth

All it is, is a triangle dude