Free Shipping Threshold Calculator
Enter the shipping you absorb, your contribution margin, and your average order value to find the cart minimum where free shipping pays for itself, plus how far your current AOV sits from that break-even point.
Free Shipping Inputs
Set your free shipping minimum at or above the point where your contribution margin covers the shipping cost you absorb. Divide the shipping cost you pay by your contribution margin rate to find that break-even cart value, then round up to give yourself a profit cushion.
What the Free Shipping Threshold Calculator Does
Free shipping lifts conversion rates, but only if the extra margin on a larger cart pays for the postage you absorb. This calculator finds the exact cart value where your contribution margin covers the shipping cost, so the offer funds itself instead of eating your profit. Enter the shipping you pay, your contribution margin percentage, and your current average order value to see your break-even free shipping threshold and how far your current AOV sits from it.
Who Should Use This Tool
Shopify & DTC Store Owners
Merchants setting a cart minimum for a free shipping bar without giving away margin on small orders.
Marketplace & Etsy Sellers
Sellers deciding whether to offer free shipping site-wide or gate it behind a spend threshold that stays profitable.
Contribution Margin & Threshold Terms Defined
The postage and packaging you pay per order to deliver it to the customer.
The percentage of each order left after product cost and variable fees, before shipping and overhead.
The cart value at which contribution margin dollars exactly equal the shipping cost you absorb.
Free Shipping Threshold Formula
The contribution margin rate is the margin percentage divided by 100. At a 35% margin, every dollar of cart value contributes 35 cents toward covering shipping. If you pay $9 in postage, you need $9 / 0.35, or roughly $25.71 in cart value, for the margin to break even on that shipping.
Worked Example: Apparel Store Free Shipping Bar
An apparel store pays $9.00 in average shipping, earns a 35% contribution margin, and sees a $42.00 average order value. They want to know if their current AOV already funds free shipping and where to set a cart minimum.
Because the $42 AOV already produces $14.70 in margin, this store covers shipping on the average order today. Setting the free shipping bar a little above $25.71 protects the offer on smaller carts while nudging shoppers to add one more item.
Setting a Cart Minimum That Pays for Itself
The break-even threshold is the floor, not the target. A common approach is to set the free shipping bar 15% to 20% above break-even, and often a few dollars above your current AOV, so the offer both stays profitable and encourages a larger basket. A bar set slightly above the average order value gives most shoppers a reason to add another item, which lifts AOV and spreads fixed fulfillment costs across more revenue.
Common Free Shipping Mistakes
Free Shipping Threshold Benchmarks
Many stores set free shipping bars roughly 20% to 30% above their average order value. The right number depends on your margin: a high-margin brand can afford a lower bar because a smaller cart still covers postage, while a thin-margin store needs a higher threshold so the extra order value carries the shipping cost. Use the calculator with your own numbers rather than copying a competitor whose margins you cannot see.
| Contribution Margin | Shipping You Pay | Break-Even Threshold |
|---|---|---|
| 25% | $9.00 | $36.00 |
| 35% | $9.00 | $25.71 |
| 50% | $9.00 | $18.00 |
Frequently Asked Questions
How do I calculate a free shipping threshold?
Divide the average shipping cost you pay by your contribution margin rate. At $9.00 shipping and a 35% margin, the break-even cart value is $9.00 / 0.35, or about $25.71. Set your bar above that number to keep every qualifying order profitable.
Should I use gross margin or contribution margin?
Use contribution margin. It removes product cost and variable per-order fees, so it reflects the dollars genuinely available to absorb shipping. Gross margin leaves out variable fees and can make the threshold look lower than it really is.
What if my current AOV already covers shipping?
Then your average order is already profitable after postage. You can still set a free shipping bar slightly above your AOV to lift the typical cart, or offer free shipping site-wide if the margin cushion is comfortable.
How far above break-even should I set the bar?
A cushion of 15% to 20% above break-even is common. Placing the bar a few dollars above your average order value also encourages shoppers to add one more item, which raises AOV over time.
MerchSites tools and guides are written and reviewed by ecommerce practitioners. Calculations are cent-accurate estimations based on reported platform fees and standard formula math.