Find the eligible subtotal
Exclude gift cards, restricted brands, taxes, and other items the coupon terms do not cover. A headline cart total can overstate the coupon value.
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Coupon or free shipping: compare the actual savings
A percentage coupon often looks more valuable, but the winner depends on your cart total and delivery fee. This calculator converts both offers into dollar savings so you can choose the larger discount without guessing.
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Use the coupon
Save $18.00That saves $6.00 more than the other offer.
Convert the coupon and shipping waiver into dollar savings on the same eligible cart. The offer that removes more from the complete checkout wins, unless the store lets you combine both.
Reviewed October 12, 2026 by Ship or Spend Co.How the calculation works
A clearer way to compare.
Coupon saving = cart total × coupon percentage. Free-shipping saving = shipping charge. The offer with the larger saving produces the lower checkout cost.
On a $120 cart, 15% off saves $18. If shipping costs $12, the coupon wins by $6.
Use the result without fooling yourself.
Convert both offers to dollars
Multiply the eligible subtotal by the coupon rate. Compare that result with the delivery charge removed by free shipping.
Rebuild the final checkout
Check whether either offer changes tax, handling, minimum-spend eligibility, or another promotion. The lower final payment is the practical winner.
Worked comparisons
Three examples that change the answer.
These examples use the same method as the calculator and show why the inputs—not the promotional headline—decide the outcome.
Small cart: shipping wins
$36 eligible cart · 15% coupon · $8 shipping
Coupon saves $5.40; free shipping saves $8.00.
Free shipping is worth $2.60 more because the cart is below the $53.34 break-even point.
Larger cart: coupon wins
$120 eligible cart · 15% coupon · $8 shipping
Coupon saves $18.00; free shipping saves $8.00.
The coupon is worth $10 more before any tax or eligibility differences.
Capped coupon: check the limit
$180 cart · 20% off capped at $25 · $14 shipping
The coupon saves $25, not $36; free shipping saves $14.
The capped coupon still wins, but ignoring the cap would overstate its advantage by $11.
Important exceptions
Cases that can change the answer.
Maximum coupon savings
A 20% coupon capped at $15 stops becoming more valuable after $75 of eligible merchandise.
Coupon lowers the threshold subtotal
Some stores measure free-shipping eligibility after discounts. A coupon can therefore restore a shipping charge.
Stacking is allowed
If both offers can apply, compare that combined checkout with every single-offer option instead of forcing an either-or decision.
Coupon vs Free Shipping FAQ
At what cart value does a percentage coupon beat free shipping?
Divide the shipping charge by the coupon rate as a decimal. With $9 shipping and a 15% coupon, the break-even eligible cart is $60.
Should I include tax in the comparison?
Include it when the discount changes taxable value in your location. The safest method is to compare the final totals displayed at checkout.
What if the coupon excludes some items?
Enter only the eligible merchandise amount as the cart value. Excluded products do not generate coupon savings.
Transparent by design
Know what the result means.
Ship or Spend shows the formula, assumptions, and complete comparison rather than hiding the answer behind a score. Read our calculation methodology for limitations and testing details, and our update log for recent editorial work.