Stack Calculator

Find the true unit cost after every discount layer: sale, manufacturer and store coupons, store rewards, percent-off, loyalty, and rebate apps. Free, no sign-in required.

Item Product name (optional — included in share link)

Regular price ($) Quantity

Per-unit cost (optional)

Size Unit

Store sale Sale type

Coupons

Manufacturer coupon

Scope: Per item Min spend

Items per coupon Coupons used

Min subtotal required ($)

Store coupon

Scope: Per item Min spend

Items per coupon Coupons used

Min subtotal required ($)

% off entire purchase (e.g. 20% off coupon) Loyalty card additional % off

Store reward (earned)

Cash back you earn at the register for next visit — CVS ExtraBucks, Walgreens Register Rewards, Target Circle Bonus, etc. Counts as a credit toward your effective per-item cost.

Program Reward earned ($) Trigger

Required quantity

Earn the reward once when you buy at least this many.

Brand Min spend on brand ($)

Assumes this transaction is all . Brand-spend rewards typically gate on the same brand, not a category.

Rebate app & tax

Cashback / rebate app (per item)

Apply sales tax

Most grocery items are tax-exempt in many U.S. states — tax is off by default.

★ Moneymaker

Out-of-pocket at register

After rebate ()
Reward earned
Effective cost
Per-item cost
Per- cost
You saved

Math order: sale → per-item coupons → min-spend coupons → %-off cart → loyalty → tax = register total. Rebate app and store reward then reduce effective cost.

True unit cost, instantly

BOGO, BOGO 50%, buy-N-for-Y, percent-off, and stacked coupons — all handled, all in one screen.

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Share any scenario

One-click share link pre-fills the calculator with every value. Perfect for couponing groups, subreddits, and group chats.

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More coming soon

Weekly ads, deal matchups, a price book, and a community deal feed are next. Built and hosted by Tuxxin LLC.