Free shipping threshold calculator: find the right minimum order

Unexpected shipping costs are one of the most common reasons shoppers abandon their cart. A threshold turns that cost into a goal: instead of paying $6 for shipping, many shoppers would rather add a $12 item they actually want and pay nothing for delivery.

That top-up is where the money comes from. You pay the shipping either way, but the extra item brings in extra profit. As long as the profit on what shoppers add is bigger than the shipping cost you now cover, the threshold pays for itself, and your average order value goes up.

You need three numbers:

• Average order value (AOV): revenue divided by number of orders, over a normal month. Shopify shows it on the Analytics overview.
• Shipping cost per order: what you pay the carrier, on average, to ship one order.
• Gross margin: the share of the selling price left after product cost. If an item sells for $20 and costs you $8, your margin is 60%.

The break-even threshold is the order size where the margin on the extra spend exactly covers shipping: AOV + shipping cost ÷ margin. With a $40 AOV, $6 shipping and a 50% margin, a shopper has to add $12 (which earns $6 profit) to pay for their own shipping. Break-even is $52.

Then pick a round number at or just above break-even, inside the 15–30% range above your AOV. In the example, $55 works well: it is a familiar number and it is a reachable top-up for most shoppers.

The calculator looks at one order that gets topped up to the threshold. Two other groups of orders change too, and it is worth thinking about both:

• Orders already above the threshold now ship free as well. If you charge for shipping today, you lose that shipping fee on these orders, and you get nothing extra for it. The more of your orders are already above the threshold, the higher it needs to be.
• Shoppers who would have left because of shipping costs may now buy. These are extra orders you would not have had at all, and they often make up for the first group.

That is why the real answer comes from testing. Note your AOV, conversion rate and shipping spend for a few weeks, launch the threshold, then compare the same numbers for the weeks after.

A threshold nobody notices does nothing. Show it where the buying decision happens:

1. 1Announce it in the bar at the top of every page: "Free shipping on orders over $55".
2. 2Repeat it next to the price or add-to-cart button on product pages.
3. 3Show progress in the cart: "You're $9 away from free shipping", with a few suggested items that would get them there.
4. 4Mention it in your shipping policy and FAQ, so nobody has to guess.

Hidden or unclear shipping information is one of the things a StorePeek check flags on your store. See our guide to ecommerce trust signals for the rest.