Joni Halabi

Important notice!
Due to a shift in my personal and professional priorities, I have decided to take a step back from development. As a result, this plugin is no longer being actively maintained. You are welcome to <a href="https://github.com/thatdevgirl/woocommerce-tiered-flat-rate" rel="nofollow ugc">fork it</a> and create your own updates. If you do so, please credit me as the original author. (I would also love to hear about this plugin’s new life!)
All the best, Joni.
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WordPress administrative users can create a tiered flat rate shipping fee based on the total number of items in a WooCommerce cart. The store administrator can choose to apply this shipping method to all allowed countries that the store may ship to or only specific countries.
There are two tiers in this shipping method:
<ul>
<li>
Base shipping fee: This is the base (default) flat shipping fee that is applied automatically to the cart total for any number of items.
</li>
<li>
Additional shipping fee for tiers: This is the additional shipping fee that is added to the base fee if the number of items in the user’s cart exceeds a specified number. This tiered fee can either be a flat fee, meaning that it is applied to carts of any size above the specified tier quantity, or a progressive fee, meaning that the tier quantity is used as a multiplier to the tiered fee.
</li>
</ul>

WC Tiered Shipping

Kudos to the developer.  This plugin was very useful.



Very helpful plugin

[Deprecated!] This WordPress plugin adds a tiered flat rate shipping option for the WooCommerce plugin.

modulux

Modulux Shipping Helper for WooCommerce is a lightweight and modular WooCommerce plugin that allows merchants to define custom weight units and flexible shipping rules for each of your products.
Use it to handle shipping calculations when your products vary in volume, type, or measurement (e.g. Kg, Litre, Desi, Lbs). Choose between total or heaviest weight-based logic per unit and automatically apply fallback pricing, VAT, and free shipping thresholds.
A built-in “Suggest Weight” tool can recommend weight values using SKU/category/tag similarity, making it even easier to manage large product catalogs.
<h3>Key Features</h3>
<ul>
<li>Define custom weight units (Kg, Deci, Liter, Pound, etc.)</li>
<li>Configure flexible shipping rules for each unit</li>
<li>Choose between Total or Heaviest Item calculation modes</li>
<li>Add fallback pricing when no rules match</li>
<li>Built-in VAT and free shipping threshold management</li>
<li>Works only with WooCommerce’s Flat Rate shipping system</li>
<li>AJAX-powered “Suggest Weight” button to automatically fill in missing weights</li>
</ul>
<h3>Shipping Logic</h3>
<ul>
<li>Products are grouped by unit (kg, liter, etc.)</li>
<li>Weight is calculated per unit:
<ul>
<li>Total mode: sum of all product weights</li>
<li>Heaviest mode: highest weight in the group</li>
</ul>
</li>
<li>Rules are matched per unit (<code>maximum → price</code>)</li>
<li>If no rule matches, a fallback is used</li>
<li>The final cost is the sum of all matching units</li>
<li>VAT is applied (if set)</li>
<li>Free shipping is applied if the cart total exceeds the threshold</li>
<li>Fallback is specified in the order management panel</li>
</ul>
<h3>Credits</h3>
Crafted by <a href="https://modulux.net" rel="nofollow ugc">Modulux</a> — WordPress plugin and theme creators.

Modulux Shipping Helper for WooCommerce

Enhances WooCommerce Flat Rate shipping by allowing per-product custom weight units, rule-based pricing, VAT, and smart calculation logic.

WC Tiered Shipping vs Modulux Shipping Helper for WooCommerce