Free Shipping Profit Threshold

First separate customer shipping revenue from merchant fulfillment and shipping cost. Customer shipping revenue is money collected from the buyer. Merchant cost is what the business pays to pick, pack, and deliver the order. Free shipping removes the former; it does not erase the latter.

Calculate contribution per regular order and per free-shipping order on the same revenue, fee, return, and cost basis. Then choose one threshold that matches the test design:

Required order lift = regular contribution / free-shipping contribution - 1

Required CVR = baseline CVR x regular contribution / free-shipping contribution

Required merchandise AOV solves: free-shipping contribution = regular contribution

The order-lift and CVR thresholds are equivalent only when traffic stays constant. The AOV threshold is a different path to the same contribution goal; do not assume all three lifts happen or add them together.

Open the $86 to $80 free-shipping scenario

This transparent example is fictional and uses USD. The regular customer pays $80 for products plus $6 shipping, so total collected order revenue is $86. Under free shipping, the merchandise basket remains $80 and customer shipping revenue falls to zero. Merchant fulfillment and shipping cost remains $8 in both cases.

Product cost is $32, other variable cost is $4, payment and platform fees are 3% of collected revenue, and expected returns loss is 5%. The model excludes tax and advertising cost and applies the fee and returns rates to the displayed total revenue basis.

Line	Regular order	Free-shipping order
Merchandise AOV	$80.00	$80.00
Customer shipping revenue	$6.00	$0.00
Total collected revenue	$86.00	$80.00
Product cost	-$32.00	-$32.00
Merchant fulfillment + shipping	-$8.00	-$8.00
Other variable cost	-$4.00	-$4.00
Fees + expected return loss	-$6.88	-$6.40
Contribution before ads	$35.12	$29.60

Free shipping reduces contribution by $5.52 per order, not $8. The $8 merchant shipping cost already existed in both cases, while the lost $6 customer charge is partly offset by $0.48 less fee and expected-return allowance under this model.

Threshold	Calculation	Required result
Orders	$35.12 / $29.60 - 1	+18.6%; about 119 instead of 100
CVR at the same traffic	2.50% x $35.12 / $29.60	2.97%; +0.47 percentage points
Merchandise AOV with fixed dollar costs	($35.12 + $32 + $8 + $4) / (1 - 3% - 5%)	$86.00; +7.5% from $80

At a fixed 2.50% baseline conversion rate, the required 2.97% is an 18.6% relative lift but only 0.47 percentage points. State both units. For the AOV path, no customer shipping charge is collected; merchandise revenue itself must rise to $86 while the example's dollar costs remain unchanged.

Decision rule: A result equal to the threshold only restores the original contribution total. Require an additional buffer if the offer must also fund creative, app, warehouse, support, or fixed campaign costs.

The $86 merchandise AOV threshold is valid only if the $32 product cost, $8 fulfillment and shipping cost, and $4 other variable cost stay fixed. That may be plausible when the lift comes from price, a high-margin add-on, or product mix. It is usually too optimistic when customers add another ordinary item.

1. Product cost: Add the incremental COGS of the extra units or changed mix.
2. Pick and pack: Increase fulfillment cost when another item adds labor, materials, or a split shipment.
3. Carrier cost: Re-rate parcels when weight, dimensions, destination, or service level changes.
4. Fees and returns: Apply percentage costs to the new revenue and use a product-mix-specific return allowance when possible.
5. Threshold eligibility: Exclude tax and decide whether discounts count toward the free-shipping minimum before interpreting checkout data.

For example, if the basket needed $2 more product cost and $1 more fulfillment cost, the same algebra would require about $89.26 of merchandise revenue, not $86. Recalculate the complete basket rather than treating extra AOV as costless revenue.

Randomize eligible traffic when possible and keep the offer window, destinations, inventory, and acquisition mix comparable. Report conversion rate, merchandise AOV, customer shipping revenue, merchant fulfillment and shipping cost, refunds, returns, order contribution, and contribution per visitor for each group.

Contribution per visitor = conversion rate x contribution per order

Contribution per visitor combines CVR and order economics without pretending the offer caused every observed difference. A before-and-after comparison can also move because of seasonality, channel mix, stock, price changes, or delivery promises. Use a controlled experiment or clearly label the result observational.

Do not use checkout conversion alone as the success metric. A lift above 18.6% can still disappoint if the offer attracts lower-margin baskets, raises return loss, or moves more orders into expensive shipping zones.

Shopify documents free-shipping rates and order-value conditions. Its sales reports document shipping charges in the sales reporting context, while profit reports provide product-cost and gross-margin context. The contribution boundary, fictional example, thresholds, and testing recommendations on this page are ROAS Break modeling judgments, not Shopify guarantees.

• Shopify free shipping ratesFree-shipping setup and order-value conditions. Checked August 21, 2026.
• Shopify sales reportsSales and shipping-charge reporting context. Checked August 20, 2026.
• Shopify profit reportsProduct cost, gross margin, and profit reporting context. Checked August 20, 2026.