Guides
How discount math and retailer coupon policies actually work — each guide carries an interactive tool, dated sources, and the retailer's own documentation.
Comparison
Discount Stacking Simulator — Does the Order Matter?An interactive stacking simulator: reorder percent discounts, dollar coupons and price floors, watch the final price move with the sequence, and export the scenario. Order matters — stacks compound, they don't add.
FAQ
Tip and Tax Calculator — Pre-Tax Tip, Split, No GuessworkCalculate the tip the customary way — on the pre-tax subtotal — and see what tipping the taxed total silently adds, with tax, both tip bases and the per-person split in one view.
Comparison
Subscription Cost Annualizer — Monthly vs Annual, Real NumbersConvert any subscription to one comparable number: monthly vs annual effective price, promo months like 'pay for 10, get 12' folded in, and the real yearly saving on Black Friday software and streaming deals.
Comparison
Gift Card Splitter — Balance vs. Discounted Order TotalStack gift card balances against a discounted order total and see exactly how much cash is still due — cards are consumed in order, leftovers are shown, and zero-cash coverage is flagged.
Comparison
Cashback Stacker — Card + Portal + Rebate Combined RateStack credit-card cashback, shopping-portal rewards and mail-in rebates on one purchase — the layers multiply, not add, and this calculator shows the real combined rate on any Black Friday price.
Comparison
Price Per Unit Calculator — Compare Sizes and Pack CountsCompare price per unit across sizes and pack counts — ounces, pounds, liters, gallons or pieces convert within their family, the cheapest option is flagged, and bulk-buy decisions stop being guesswork.
Comparison
Black Friday 2026: When Deals Start and How to Plan Your StackWhen Black Friday 2026 deals are likely to start, how early access has worked at major retailers, and a stack planner to price a deal before checkout — based on official 2025 event schedules.
Pitfall guide
How to Stack Coupons (and When Retailers Won't Let You)The layer order that actually works — store, manufacturer, cart and cashback — plus per-retailer stacking rules and the math that shows what a stack is really worth.
FAQ
One Coupon per Order: Which Retailers Allow More Than OneA per-retailer table of coupons-per-order limits — who allows a store plus a manufacturer coupon, who caps you at one, and where each rule is documented.
Pitfall guide
Black Friday Electronics Deals: How to Check a Discount Before You BuyElectronics are the most-stacked Black Friday category — and the easiest to overpay in. A three-step discount check plus price-adjustment windows at major retailers.
FAQ
Black Friday Appliance Deals: Check the Price-Protection Window FirstAppliance Black Friday prices are often ticketed event prices — check the price-adjustment window and stacking exclusions before you commit to the delivery date.
Comparison
Black Friday Toy Deals: Plan the Basket, Not Just the DiscountToy hauls are many-item purchases, so coupon limits matter more than any single discount. Plan a multi-item basket against each retailer's stacking rules and see the real total. Sources included.
FAQ
Black Friday Shopping List Generator (Free, Printable)Build a Black Friday shopping list, see the real stacked price per line, and compare each retailer's coupon-stacking and price-adjustment rules side by side. Export a PDF or print — no sign-up, works in your browser.
Pitfall guide
Can You Stack Coupons on Black Friday? What Changes in the Fine PrintHoliday fine print narrows: doorbusters usually take no coupons, and exclusions pile up. What still stacked in 2025, retailer by retailer, with verified dates.
Comparison
Black Friday Price Match: Which Stores Match (and Which Pause It)Holiday doorbuster prices are the most-excluded category in every price-match policy. Which stores match year-round, which paused, and the three conditions to check.
Pitfall guide
Black Friday Doorbusters: How the Limited-Time Pricing WorksQuantity limits, per-store caps, and time windows — what doorbuster pricing actually is, what the 2025 windows looked like, and how to price whether the queue is worth it.
Comparison
Pre-Black Friday Sales: Timing the Early Deals (2025 Record)Pre-Black Friday sales have grown into weeks of rolling deals. What the 2025 season's early windows looked like at Walmart, Target, Amazon and Best Buy — and how to decide whether to buy early or wait.
FAQ
When Are Black Friday Ads Released? The 2025 Release TimelineBlack Friday ads now arrive as corporate announcements weeks before the sale starts. When 2025's major announcements landed relative to the actual sale windows, and how to build your list from them.
FAQ
Black Friday Price Guarantee: Who Refunds the Difference (and How Long)Bought during Black Friday and the price dropped after? A retailer-by-retailer look at post-purchase price adjustment windows from 2025's terms, and how to claim the difference.
Pitfall guide
7 Black Friday Shopping Mistakes (and the Math to Avoid Them)The costliest Black Friday mistakes are math mistakes: trusting a fake anchor, stacking that doesn't stack, skipping the price-adjustment window. Seven pitfalls, each with a quick way to quantify the damage.
FAQ
BOGO Deals: What "Buy One Get One" Is Actually WorthBOGO 50% off is 25% off per item; true BOGO is 50% only if you'd buy both anyway. The equivalent-discount math for every BOGO variant, plus what happens when you stack a coupon on top.
FAQ
Does Amazon Do Price Adjustments? The Policy and the WorkaroundsAmazon does not offer post-purchase price adjustment on general merchandise. What the policy actually says, the return-and-reorder alternative, and when that trade-off makes sense.
FAQ
Micro Center Price Match & Price Adjustment: The 30-Day WindowMicro Center matches major online competitors in store and adjusts to its own price drops within 30 days. The current rules, exclusions, and where both are documented.
FAQ
Walmart Price Match Policy: What It Covers in 2026Walmart's general competitor price match is gone; what remains is limited own-store matching and post-purchase rules that vary. The current policy, what it doesn't cover, and where it's documented.
FAQ
B&H Photo Price Adjustment: The Return-Period Window ExplainedB&H adjusts to its own price drops within the return and exchange period — 30 days for most merchandise. The adjustment rules, the separate price-match policy, and how to claim.
FAQ
Do Coupons Work on Sale Items? How Exclusions Decide ItWhether a coupon works on a sale item comes down to the coupon's terms and the retailer's exclusions — clearance, doorbusters and marketplace items are the usual blockers. The exclusion types, retailer examples, and a matrix to check your case.
FAQ
How to Calculate 20 Percent Off (Quick Mental Math)To calculate 20% off: multiply the price by 0.8 (or take a fifth off). The formula, quick mental-math shortcuts, worked examples at common price points, and a calculator to check yourself.
FAQ
How to Find the Original Price Before a DiscountOriginal price = sale price ÷ (1 − discount rate). The reverse-discount formula, why "add the percent back" gets it wrong, and worked examples for common cases.
FAQ
The Successive Discount Formula (and Why It Isn't a+b)Successive discounts multiply: (1−a)(1−b)(1−c). The formula, the expansion, why 20% + 10% + 5% is not 35% off, and the equivalent single discount worked out step by step.
FAQ
Manufacturer vs Store Coupons: Who Issues Them and What StacksManufacturer coupons come from brands and often stack with store offers; store coupons come from the retailer and usually can't combine with each other. The two coupon types, how loyalty offers fit in, and a stacking-eligibility card for your combination.
FAQ
Can You Use Multiple Coupons at Kohl's? The 4-Coupon StructureKohl's allows up to four coupons per order: one sitewide percent-off, category codes, and dollar-off rewards — applied in a specific order. The official structure, exclusions, and sources.
FAQ
Does Best Buy Price Match Amazon? Yes — With These ConditionsBest Buy price matches Amazon and other listed competitors on identical in-stock items, with exclusions: marketplace sellers, event pricing and more. The checklist, plus sources and dates.
FAQ
Costco Price Adjustment: 30 Days for Electronics, ExplainedCostco adjusts to its own lower price within 30 days for electronics; other categories ride on longer return windows. How the window works and what to check first.
FAQ
Does Target Adjust Prices After Purchase? The 14-Day WindowTarget adjusts to its own lower price within 14 days of purchase — but it no longer price-matches competitors. What qualifies, what's excluded, and how to request it.
FAQ
Macy's Price Adjustment: 10 Days (14 for iPhones) — The DetailsMacy's adjusts to its own price drops within 10 days of the order date; Apple items differ (iPhones 14 days, other Apple 30). The window, exclusions, and how to request.
FAQ
Newegg Price Protection: The 7-Day Window, ExplainedNewegg matches its own price drops within 7 calendar days, refunded as a Customer Care card. What counts, the long exclusion list (Black Friday event prices included), and sources.
FAQ
Does Home Depot Price Match Lowe's? (And Vice Versa)Home Depot and Lowe's each price match the other on identical in-stock items — with exclusions for Black Friday and holiday event prices. The 2026 one-to-one change at Home Depot, explained.
FAQ
Two Discounts in a Row — Successive Discount Formula & ExampleTwo discounts in a row multiply, they don't add: 30% off then 20% off is 44% total, not 50%. The formula, worked examples, and a calculator to check any combination.
FAQ
$10 Off vs 20% Off — The Break-Even Price, ExplainedA dollar-off coupon beats a percent-off coupon when the price is below the break-even point: dollar amount ÷ percent. The formula, a table of common break-evens, and the fine-print caveat.
FAQ
Percent Off Chart — 10% to 90% Off, Instant TableA percent-off chart for common prices at every discount from 10% to 90%, plus a calculator for any price or stacked discounts.
Comparison
Black Friday Online vs In-Store — Tracks, Early Access & TacticsBlack Friday runs on two tracks: online waves and in-store doorbusters. How the tracks differed at major retailers in 2025, and how to pick the right one for your list. Official schedules, no predictions.
Comparison
Cyber Monday vs Black Friday — What Actually DiffersSeven days apart, most of the fine print shared. Date facts for 2026, the 2025 channel records, and which price-protection window applies to each. No predictions.
Pitfall guide
Cyber Monday Coupon Stacking — What the Fine Print AllowsOne exclusion clause covers both windows: event prices take no codes. What the documented terms show retailer by retailer, and the adjustment windows that run after the event.
Pitfall guide
Do Prices Rise Before Black Friday? A 3-Step Anchor CheckWhether some prices rise before Black Friday is debated — instead of guessing, check the anchor yourself in three steps: record, compare, compute the real discount. FTC guidance included.
FAQ
Black Friday Return Policy — Holiday Windows by Retailer (2026)Return windows around Black Friday differ by retailer — some extend them for the holidays, event prices can be final, and adjustment windows vary from 7 to 60 days. Check before you buy, with sources.
FAQ
20% off $40 — Sale Price, Formula & Quick ChartWhat 20% off $40 works out to ($32 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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20% off $50 — Sale Price, Formula & Quick ChartWhat 20% off $50 works out to ($40 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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20% off $60 — Sale Price, Formula & Quick ChartWhat 20% off $60 works out to ($48 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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20% off $80 — Sale Price, Formula & Quick ChartWhat 20% off $80 works out to ($64 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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20% off $100 — Sale Price, Formula & Quick ChartWhat 20% off $100 works out to ($80 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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25% off $40 — Sale Price, Formula & Quick ChartWhat 25% off $40 works out to ($30 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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25% off $60 — Sale Price, Formula & Quick ChartWhat 25% off $60 works out to ($45 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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25% off $80 — Sale Price, Formula & Quick ChartWhat 25% off $80 works out to ($60 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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25% off $100 — Sale Price, Formula & Quick ChartWhat 25% off $100 works out to ($75 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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30% off $40 — Sale Price, Formula & Quick ChartWhat 30% off $40 works out to ($28 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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30% off $50 — Sale Price, Formula & Quick ChartWhat 30% off $50 works out to ($35 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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30% off $60 — Sale Price, Formula & Quick ChartWhat 30% off $60 works out to ($42 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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30% off $100 — Sale Price, Formula & Quick ChartWhat 30% off $100 works out to ($70 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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30% off $200 — Sale Price, Formula & Quick ChartWhat 30% off $200 works out to ($140 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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40% off $60 — Sale Price, Formula & Quick ChartWhat 40% off $60 works out to ($36 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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40% off $80 — Sale Price, Formula & Quick ChartWhat 40% off $80 works out to ($48 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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40% off $100 — Sale Price, Formula & Quick ChartWhat 40% off $100 works out to ($60 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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50% off $30 — Sale Price, Formula & Quick ChartWhat 50% off $30 works out to ($15 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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50% off $50 — Sale Price, Formula & Quick ChartWhat 50% off $50 works out to ($25 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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50% off $100 — Sale Price, Formula & Quick ChartWhat 50% off $100 works out to ($50 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
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70% off $100 — Sale Price, Formula & Quick ChartWhat 70% off $100 works out to ($30 at the register), the one-line formula, a mental-math route, and a calculator to check any other tag.
Just need a number? Jump straight to the discount calculator or the retailer rules dataset.