Custom Box - Displacement using water?

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Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=10305
Printed Date: August 20, 2025 at 6:46 AM

Topic: Custom Box - Displacement using water?

Posted By: moparfreak77
Subject: Custom Box - Displacement using water?
Date Posted: March 02, 2003 at 10:45 AM

Hey Guys, new to the site, got a quick question. I am building a custom box that goes around a wheelwell and I was hoping to use water to calculate the volume, but I am unsure about what water weighs a cubic foot. Is this alright doing this? Thanks a ton.

Replies:

Posted By: DjIQ
Date Posted: March 11, 2003 at 10:49 AM

Whats Up Mopar,

1 Cubic Foot = 1,728 cubic inches

1 Gallon = 231 cubic inches

If you divide the gallon into the cubic foot, you will find that water will weigh approximatly:

7.48lbs per cubic foot

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Posted By: DjIQ
Date Posted: March 11, 2003 at 10:55 AM

Im sorry my calculations were off..... theres 7.48 gallons of water in a cubic foot, the 7.48 gallons of water would weigh 62.4 lbs

so to correctly answer your question 1 cubic foot of water weighs 62.4 lbs

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Posted By: moparfreak77
Date Posted: March 11, 2003 at 4:53 PM

thanks dude. that will help

Posted By: iaudio
Date Posted: March 17, 2003 at 6:38 PM

Use packing peanuts and a carboard box. Cut the cardboard box down to the desired volume and fill with packing peanuts. Then take the peanuts and dump them in the enclosure to figure out the enclosure volume.

Posted By: benjammin1414
Date Posted: March 18, 2003 at 2:40 AM

great idea iaudio.

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