Calculate the gap
Subtract the current eligible cart from the required spend. Use the subtotal defined by the promotion, which may exclude tax, shipping, or selected products.
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Is a spend-threshold discount actually worth chasing?
“Spend more, save more” promotions can lower your bill—or persuade you to buy things you did not need. Compare your current cart with the qualifying checkout to see the real out-of-pocket difference.
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Your result
Chase the deal
Save $2.00You need to add $18.00 to qualify; the discounted checkout would be $80.00.
A threshold deal lowers today’s payment only when the added amount needed to qualify is smaller than the discount unlocked. The added products can still be worthwhile, but that is separate from cash saved.
Reviewed October 12, 2026 by Ship or Spend Co.How the calculation works
A clearer way to compare.
Qualifying total = deal threshold − discount. Compare that amount with your current cart. If the qualifying total is lower, chasing the deal saves money before tax.
A cart at $82 needs $18 more to reach a spend-$100-get-$20-off offer. The discounted total becomes $80, which is $2 less than the original cart.
Use the result without fooling yourself.
Calculate the qualifying checkout
Add enough eligible merchandise to reach the threshold, then subtract the promotional discount.
Compare with the original plan
Subtract the qualifying checkout from the cart you already intended to buy. A positive difference is immediate cash saved.
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.
The deal lowers the payment
$86 cart · spend $100 · get $20 off
Add $14; the qualifying checkout becomes $80.
You receive $14 of added goods and pay $6 less than the original cart.
The deal costs more
$65 cart · spend $100 · get $20 off
Add $35; the qualifying checkout becomes $80.
The promotion costs $15 more than the original plan, so it only makes sense if the added items were already needed.
Exact cash break-even
$80 cart · spend $100 · get $20 off
Add $20; the qualifying checkout remains $80.
Your payment is unchanged. The extra product is only valuable if you will genuinely use it.
Important exceptions
Cases that can change the answer.
The discount equals the gap
Your payment is unchanged. You receive the extra product at no additional cash cost, but only if it is genuinely useful.
Partial returns
A return may push the retained cart below the threshold and cause the discount to be deducted from the refund.
Tiered promotions
For deals such as $10 off $50 or $25 off $100, calculate each reachable tier separately and compare all final totals.
Spend-Threshold Discount FAQ
Is spend $100, get $20 off always 20% off?
It is 20% off a qualifying $100 cart, but it may not save 20% compared with the smaller cart you originally planned to purchase.
Does shipping count toward the spending threshold?
Retailer rules differ. Most thresholds use an eligible merchandise subtotal, so confirm the terms or the progress indicator in the cart.
Should an unwanted filler item count as value?
No. The calculator shows cash paid. Treating an unwanted item as a benefit can make a mathematically cheaper checkout a poor purchase.
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.