What Is a Free Shipping Threshold? Margin Math

Quick Definition

A free shipping threshold is the minimum order amount a shopper has to reach before shipping becomes free. Think "free shipping on orders over $75." Below that amount, the shopper pays for delivery. Stores use it to nudge people into slightly bigger carts, so the extra sales help cover the cost of shipping.

How a Free Shipping Threshold Works

You pick a cart total, like $60. Anything under it pays for shipping, and anything at or above it ships free. A shopper sitting at $48 may prefer to add a $12 item instead of paying $9 for shipping.

You get a bigger order, but now you're the one paying for shipping. So the threshold only makes sense if the extra sale earns more than that shipping cost.

That's not the same as plain free shipping, where every order ships free and there's no minimum. With a threshold, free shipping becomes a goal the shopper has to hit.

Where It Shows Up in a Shopify Store

Shopify's own settings give you two common ways to set it up. You can add a shipping rate that only applies above a set order price, or create a free shipping discount with a minimum purchase amount.

You can show it in an announcement bar or as a note in the cart, like "You're $12 away from free shipping." Growth Suite, our app, has a cart drawer that can show free shipping goals as a to-do. It can also suggest items based on what's already in the cart. If you're comparing tools that add nudges like this, see our list of the best Shopify upsell and cross-sell apps.

The Margin Math Behind the Line

Example: Say your average order is $50 and you keep 50% of each sale after product costs. Shipping costs you $9 an order. You set free shipping at $60, so shoppers under $60 still pay the $9 themselves.

What the shopper does	Cart total	Who pays the $9	Your profit after shipping
Adds nothing	$50	Shopper	$25.00
Adds a $10 item	$60	You	$21.00
Adds a $25 item	$75	You	$28.50

The $60 order is bigger, yet it earns you $4 less. To break even, the add-on has to earn back the $9. At a 50% margin that's an item of at least $18, which makes the cart $68.

Then there's a third group. Picture a shopper who already had $80 in the cart. They used to pay for shipping. Now you pay the $9 and don't sell anything extra. So the real math can't stop at shoppers who add enough. It has to count the ones who add too little and the ones who were already over the line. And it should count people who finish checkout only because shipping turned free.

When a Free Shipping Threshold Loses Money

It's set too high. If the gap feels big, most shoppers won't bother closing it. They pay for shipping or leave, and not much changes.
It's set too low. If most orders already clear it, you're mostly paying shipping on orders you'd have gotten anyway.
Margins are thin or items are heavy. The add-on just can't earn enough to cover the shipping cost.
Shoppers buy filler. Cheap stuff picked only to qualify may come back as returns, and that adds cost.

Want help choosing the number and testing it on your own orders? Read our guide to free shipping thresholds and AOV. Before you pick a line, it's also worth comparing your average with Shopify AOV benchmarks.

Misconception: A Higher AOV Means It Worked

It's tempting to check average order value after launch and call it a win when it goes up. But the average can rise for the wrong reason. If you raise the threshold, or switch from free shipping on everything to a threshold, some small-cart shoppers may stop buying. Fewer small orders lift the average, even if total sales fall. So look at order count, profit after shipping and revenue per visitor too.