Hong Life CalculatorsUnderstanding the free shipping threshold — concept and principle
A free shipping threshold, such as "free delivery on orders over $50", encourages customers to add a little more to their basket. Set it too low and you pay shipping on orders that barely earn anything; set it too high and customers ignore it. This calculator suggests a threshold based on your current average order value (AOV), and checks that your gross margin on an order at that level is enough to cover the shipping you will absorb. It works with any currency.
How it is calculated
- Common rule: AOV × 1.25 (25% above your current average order)
- Minimum order where margin covers shipping = shipping cost ÷ (gross margin ÷ 100)
- Suggested threshold = the larger of the two
Current AOV is total revenue divided by the number of orders. Average shipping cost is what you pay the carrier per order. Gross margin is the share of each sale left after the cost of goods.
The principle
The threshold has two jobs. First, it must sit above what customers already spend, otherwise most orders qualify without changing behaviour and you simply give away shipping. A level about 20–30% above the AOV is a widely used rule of thumb, because it is a stretch most shoppers can reach with one more item. Second, it must be profitable: gross profit on the order, order × margin, must be at least the shipping cost. Taking the larger value ensures both conditions are met.
Worked example
- AOV rule: 42 × 1.25 = $52.50.
- Margin floor: 7 ÷ 0.45 = $15.56.
- Suggested threshold = max(52.50, 15.56) = $52.50.
- Check: an order of $52.50 earns 52.50 × 0.45 = $23.63 gross profit, leaving about $16.63 after the $7 shipping.
How to read the result
When the AOV rule is the larger figure, as here, profitability is comfortable and the main question is whether customers will stretch to reach the threshold. If the margin floor is higher, your margin is too thin for free shipping near your normal basket, so consider a higher threshold, a flat shipping fee or a price review. After launch, watch AOV, conversion rate and the share of orders that qualify.
Common mistakes
- Setting the threshold below the current AOV.
- Using markup instead of gross margin.
- Using the cheapest carrier rate rather than the average cost, including heavy or remote orders.
- Forgetting that returns on free-shipping orders can cost shipping twice.
FAQ
Frequently asked questions
Why 25% above AOV?
It is a common starting point, not a law. Many stores test values between about 15% and 40% above AOV and keep the one that lifts profit most.
Should the threshold match my product prices?
It helps if a typical basket plus one popular item lands just above it, so customers have an easy way to qualify.
Is free shipping on all orders ever better?
It can be when margins are high and baskets are consistently large enough to cover shipping comfortably.
Sources: Horngren, Datar & Rajan — Cost Accounting: A Managerial Emphasis (Pearson)