Add the actual selected box prices in cents
The three selected reference amounts are 949,1299 and 1679 cents. One box of each totals 3927 cents, or $39.27. The tool converts valid decimal-price strings to integer cents before comparing a credit with the merchandise base. A binary floating-point mismatch therefore does not decide whether a credit exactly equal to the selected subtotal should be accepted.
Allow equality and reject one cent too much
A confirmed merchandise-only credit of $39.27 leaves zero merchandise for the reference basket. A credit of $39.28 is unresolved because it exceeds that base. This is arithmetic validation, not proof that a coupon or account credit qualifies at the retailer. The site does not automatically apply a multi-buy banner, subscription price or membership discount to a different selected basket.
Keep actual separate charges after credit
If shipping is explicitly quoted as $4.99, full merchandise credit does not remove that charge. Tax and other charges also need explicit values, including confirmed zeros, before a full entered total is shown. Blank charges remain unknown. A fractional-cent charge is not rounded into an apparently complete quote. The calculator does not determine tax law, delivery eligibility or whether the seller accepts an entered credit.
Check a meaningful decimal boundary
Two explicit user-entered $47.99 offers produce $95.98. Full credit of $95.98 leaves zero, while $95.99 is rejected. Three ten-cent items produce thirty cents. These are calculation test inputs, not observed coffee prices. Money allows at most two fractional digits and rejects blank, negative, scientific-notation or out-of-range inputs. Selling counts are validated separately as whole boxes; stock and compatibility are not inferred from arithmetic.
Keep shipping after merchandise reaches zero
A full $39.27 credit on the actual reference basket leaves zero merchandise. If actual shipping is entered as $4.99 with all other charges explicitly zero, the entered total remains $4.99. Blank tax is still unresolved. That behavior prevents an apparent free delivered order from being manufactured by the calculator, while retaining exact integer-cent arithmetic for the selected merchandise and one-cent excess-credit boundary.
Sources & scope
Checked November 4, 2026. Manufacturer and retailer references support the specific statements. Dated displayed prices are not final checkout quotes, performance rankings or performance testing. This shopping reference does not replace the exact product label or qualified individual advice. Current received labels and independent food/compatibility/content/commerce review remain pending.
Target: selected Starbucks Pike Place Original10,TCIN78308143 ↗
Target: selected Starbucks Pike Place Vertuo8,TCIN81279967 ↗
Target: selected Green Mountain Breakfast Blend24,TCIN79582224 ↗
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