DIM weight is calculated by multiplying the length, width, and top with the package deal or box size, then dividing by a normal DIM divisor. Shipping carriers like USPS, FedEx, and UPS calculate shipping charges https://scrapbookmarket.com/story18118705/how-much-you-need-to-expect-you-ll-pay-for-a-good-estimate-shipping-costs-for-ecommerce-store