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  1. #1
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    Default USPS shipping module / tare weight

    This tare weight is driving me nuts.

    zen cart version 1.3.8a

    Goal: Set up USPS shipping module using tare weight so multiple orders in the same session do not compound packaging materials weight

    IE: I want to set it up so that the tare weight is added only one time into a total multiple purchase weight.

    My average packing supply weight is about 7oz or .4375

    When I add a product to the catalog I enter its actual weight, not the packaged weight.


    I have my product weight entered as pounds and ounces in the decimal point system.

    IE:

    Book 1 weighs 10 oz = .625
    Book 2 weighs 6 oz = .375
    Book 3 weighs 1lb 6oz = 1.375
    total weight 2lbs 6oz = 2.375

    I test the shopping cart for product weight calculation per item.

    I add a book to the shopping cart. Above the item it shows how many items and the how much it weighs.
    The weight shows correctly. I add the other two books to the cart, one at a time to see if the weight is calculated correctly for each addition. The weight is correct for each addition.

    In shipping/packaging > the "Small to Medium - added percentage:weight", I'm thinking to set a percentage figure with weight set at 0 is the way to accomplish what I want. I have tried adjusting the percentage weight until the cart shipping estimator total lines up with USPS website calculations.
    This worked until I added in a third book and then the tare weight goes higher than expected. So I back the tare percentage down until it again lines up with USPS website calc.

    The problem is when I add just one book to the cart I get offered first class mailing when I know once packaged it will be too heavy for 1st class.

    I hope this explanation makes sense. Anyway with the weight figures I've given and my goals what should I be doing with the tare to get things correct?

    Has anyone else had success with this?
    Last edited by buildingblocks; 13 Oct 2008 at 07:29 PM.

  2. #2
    Join Date
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    Default Re: USPS shipping module / tare weight

    If I set the Tare to 0:3 then I add 3 lbs to the Total weight of the Order ... not per product ...

    What are your settings in the Configuration ... Shipping/Packaging ...
    Linda McGrath
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  3. #3
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    Default Re: USPS shipping module / tare weight

    >>
    What are your settings in the Configuration ... Shipping/Packaging ...<<


    Package Tare Small to Medium - added percentage:weight 35:0

  4. #4
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    Default Re: USPS shipping module / tare weight

    Book 1 weighs 10 oz = .625
    Book 2 weighs 6 oz = .375
    Book 3 weighs 1lb 6oz = 1.375
    total weight 2lbs 6oz = 2.375

    2lbs 6oz is more than 13oz ...

    13 oz is 0.8125 ...

    .625 + 35% is 0.84375
    .375 + 35% is 0.50625
    1.375 +35% is 1.85625

    Kinda makes it hard to keep in the 13oz rule with that Tare setting ...
    Linda McGrath
    If you have to think ... you haven't been zenned ...

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  5. #5
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    Default Re: USPS shipping module / tare weight

    >>Kinda makes it hard to keep in the 13oz rule with that Tare setting ... <<

    It sure does.

    Suggestions welcome from anyone who worked something out along the lines of what I'm trying to do.

  6. #6
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    Default Re: USPS shipping module / tare weight

    Set the Tare to 0:0 and there isn't a Tare added ...

    Do you need the Tare weight? Or, could you manage it with a Handling charge?

    Or can you explain better when you do or don't need a Tare Weight added?
    Linda McGrath
    If you have to think ... you haven't been zenned ...

    Did YOU buy the Zen Cart Team a cup of coffee and a donut today? Just click here to support the Zen Cart Team!!

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