# Free shipping by weight on Shopify, such as free over $100 up to 20 kg

To limit free shipping by weight, add the condition **Cart weight Is at most 20 kg** next to your cart value condition, and set the rates to **Free**. Shopify's own [free shipping discount](https://help.shopify.com/en/manual/discounts/discount-types/free-shipping) has no weight condition. Its only minimums are a purchase amount or a number of items. [RM: Advanced Free Shipping](https://apps.shopify.com/better-free-shipping) checks the cart weight in g, kg, oz or lb, alone or together with cart value, products and location. It costs $9.90 USD every 30 days, with a 7-day free trial, billed by Shopify.

## What the customer gets

In this example the offer is free shipping over $100, up to 20 kg. The rates are Standard $8.90 and Express $24.90.

- **A $120 cart weighing 6 kg:** both conditions pass. Standard and Express are free. The customer pays $120.
- **A $120 cart weighing 28 kg:** it's over 20 kg, so it doesn't qualify. With Standard, the customer pays $120 + $8.90 = $128.90.
- **An $80 cart weighing 3 kg:** it's under $100, so it doesn't qualify. With Standard, the customer pays $80 + $8.90 = $88.90.

The weight is each product's weight in Shopify, times the quantity. Two 4 kg planters and one 2 kg bag of soil weigh 10 kg.

## Set it up

1. In the app, click **Create Shipping Discount**. Under **Discount method**, choose **Automatic discount**, and enter a **Title** such as "Free shipping over $100".
2. In **Conditions**, click **Add condition**. Keep **Cart total**, set **Is at least** and enter `100`.
3. Click **Add condition** again and choose **Cart weight**. Set the operator to **Is at most**.
4. **Choose kg first**, then enter `20`. The unit starts on g (grams), and 20 g is not 20 kg.
5. In **Discount setup**, set **Delivery type** to **Shipping**, **Which rates** to **All shipping rates** and **Discount value** to **Free**.
6. Click **Create discount**.

Both conditions sit in the same rule group, so both must pass.

![The Create shipping discount page with Automatic discount selected, a Cart total Is at least $100 condition, and Discount setup set to Shipping, All shipping rates, Free](/images/create-discount.png)

The screenshot shows the $100 condition. Add the **Cart weight** condition under it with **Add condition**.

## Variations

- **Free shipping on light parcels only:** use just **Cart weight Is at most 2 kg**, with no cart value condition.
- **A shipping credit for heavy orders:** in a second discount, use **Cart weight Is greater than 20 kg** and **Cart total Is at least 100**, with **Fixed Amount Off** `15`. With live carrier rates, a $42.00 heavy Standard rate drops to $27.00.
- **Free Standard under 20 kg, Express at full price:** set **Which rates** to **Choose specific rates** and select Standard.
- **Free shipping under 5 lb in the US:** choose **lb**, enter `5`, and add **Shipping country Is one of United States**.
- **Light parcels, or any cart over $150:** open the **⋯** menu on **Conditions** and choose **Add rule group**. Put the weight in one group and **Cart total Is at least 150** in the other.

## Good to know

- **To count every product, give every product a weight.** Products with no weight set count as 0, so a cart full of unweighed items passes "Is at most 20 kg".
- **To mix units, do nothing.** Products weighed in g, kg, oz or lb are converted to the unit you picked.
- **To leave oversized items out by product, not weight**, use **Product collection Does not contain** with a collection such as "Oversized". See [free shipping except oversized items](/guides/free-shipping-except-oversized-items.md).
- **To test it**, turn on **Test mode**, check out with the shipping first name `ABC123`, and try a cart just under and just over 20 kg.

## Related

- [Free shipping over $100](/guides/free-shipping-over-100.md)
- [Free shipping by quantity](/guides/free-shipping-by-quantity.md)
- [Give a shipping credit](/guides/shipping-credit.md)
- [Conditional free shipping on Shopify](/conditional-free-shipping.md)

[Install RM: Advanced Free Shipping from the Shopify App Store](https://apps.shopify.com/better-free-shipping).