Free shipping threshold: how to calculate it

Say your average shipping cost is $10, your gross margin is 30% and your average order value is $50.

Think about what a customer has to add to their basket for the extra profit to cover the shipping you are now absorbing. If your margin is 30%, every extra dollar of product earns you 30 cents. To earn back $10 of shipping you need $10 / 0.30, which is $33.33 of additional sales. Starting from the average order of $50 and asking customers to reach $83.33 means the growth in basket size funds the free delivery.

It also shows why margin matters so much. A thinner margin means each extra dollar earns less, so the extra spend you need goes up quickly. A store on a 20% margin needs a threshold well above one on 40%, even if the shipping cost and order value are identical.

1. Divide shipping by margin: 10 / 0.30 = 33.33.
2. Add the average order value: 33.33 + 50 = 83.33.
3. Round to a number that reads cleanly, such as $85 or $80 depending on how aggressive you want to be.

The formula is only as good as the three numbers you put in, so spend a little time on them.

• Use a 12-month window. A shorter one can catch a sale period, a courier price change or a seasonal spike and skew every figure.
• Use the median order value instead of the mean if a few very large orders pull the average up. The median shows what a typical customer actually spends.
• Count the full shipping cost: the courier label, the box, the tape and filler, and any insurance or fuel surcharge. Leaving out packaging makes the threshold too low.
• Use gross margin after the cost of the goods, not the markup. If you buy at 70 and sell at 100, the margin is 30%, not 43%.
• Calculate shipping cost on the orders you would give free shipping to, rather than across your whole customer base, if your delivery destinations vary a lot.

Treat the first number as a hypothesis. Run it for four to six weeks, or for long enough to collect a meaningful number of orders, and compare with the period before.

1. Record your baseline: average order value, orders per week, conversion rate and shipping cost per order.
2. Set the new threshold and leave everything else alone, so you can attribute changes to it.
3. Track the share of orders landing just above the threshold. A cluster there suggests customers are adding items to reach it, which is the effect you want.
4. Watch your average order value and profit per order, and not only the order count. More orders at a lower margin can still lose money.
5. Try one adjacent threshold, either slightly higher or lower, for a similar period and compare results.
6. Keep the version that gives you the best profit per order after shipping.

In WooCommerce the free shipping method is added to a shipping zone and can require a minimum order amount.

1. Go to WooCommerce > Settings > Shipping and open the shipping zone you want to change, or add a new zone for the regions you serve.
2. Choose Add shipping method and select Free shipping.
3. Open the method to edit it and set the requirement to a minimum order amount.
4. Enter your threshold in the minimum order amount field and save.
5. If you use discount coupons, check the option about applying the minimum before or after the coupon, so a coupon cannot unintentionally push a cart below the threshold or leave free shipping on a cart that should not get it.
6. For bulky products, assign a shipping class under WooCommerce > Settings > Shipping > Classes, then give that class its own rate in a flat rate method. You may need a plugin or a small piece of code to hide free shipping when a bulky item is in the cart.

Once shipping is free, customers expect the parcel to arrive without effort or chasing. Free delivery makes people more likely to ask where an order is, since they have no price on the line and nothing to remind them of the tracking number. Send tracking information at dispatch and make the status easy to find.

This is where TrackIt For Business can help. It tracks parcels from the couriers you already use, turns completed WooCommerce orders into tracked shipments automatically, and gives customers a branded Apple Wallet or Google Wallet pass that updates as the parcel is scanned. Shopify stores can add shipments by CSV import or the REST API. Measure your own volume of where-is-my-order messages before and after, because the share varies a lot from store to store.