How to calculate shipping fees based on order quantity

You can use the QUANTITY function to calculate the order quantity and then write formulas based on this order quantity to apply a per-item shipping fee, a tiered shipping fee & other advanced shipping fee options.

Create Flexible Shipping Rates Using WooCommerce Shipping Calculator - weDevs

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Shipping rates based on total product price and cart weight

Joom Shipping Fee – Joom Help Center for Merchants

Surcharge shipping rate based on weight and order quantity

Magento 2 Shipping Table Rates & Matrix, Magento Multiple Flat Rate Shipping Generator

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How to Calculate Minimum Order Quantity For Free Shipping

Surcharge Increment shipping OR Product base shipping Shopify custom shipping