Title: USPS plugin Priority flat rates incorrect
Last modified: August 30, 2016

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# USPS plugin Priority flat rates incorrect

 *  [RolandM5](https://wordpress.org/support/users/rolandm5/)
 * (@rolandm5)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/usps-plugin-priority-flat-rates-incorrect/)
 * Hello,
 * I am trying to setup the USPS plugin for use with my site. I have selected “Use
   offline rates” and have turned on “Flat rate services.” I intend to ship using
   the USPS flat-rate priority boxes (small, medium, and large). I have also defined
   product dimensions and weights for all of my products.
 * However, when I have tested the shipping rates in my store, the calculated rates
   are inaccurate and do not increase based on the product sizes. For example, I
   have a soap bar that is 2.75 x 2.125 x 0.75″, which is 4.383 cubic inches. A 
   small flat-rate priority box is 8.625 x 5.375 x 1.625″, which is 75.333 cubic
   inches. The price of this small box on the USPS website is $5.95 up to 70 lbs.
 * So I should be able to fit 17 of these soap bars into one of these boxes (75.333/
   4.383 = 17.18). Any number over 17 should trigger either a second box or the 
   larger box size, in my understanding.
 * The problem is that I have to increase the quantity to 27 soaps bars to trigger
   any increase in price. The plugin right now shows $6.31 (with tax) for shipping
   for all quantities of this soap bar up to 27. Thus, I would have to use a larger
   box or multiple boxes and eat that shipping cost.
 * Can someone please help me to configure this plugin correctly since the automatic
   box packer seems to be incorrect? Thank you in advance.

The topic ‘USPS plugin Priority flat rates incorrect’ is closed to new replies.

## Tags

 * [flat rate](https://wordpress.org/support/topic-tag/flat-rate/)
 * [priority](https://wordpress.org/support/topic-tag/priority/)
 * [usps](https://wordpress.org/support/topic-tag/usps/)

 * 0 replies
 * 1 participant
 * Last reply from: [RolandM5](https://wordpress.org/support/users/rolandm5/)
 * Last activity: [10 years, 9 months ago](https://wordpress.org/support/topic/usps-plugin-priority-flat-rates-incorrect/)
 * Status: not resolved

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