Cyber Monday Discount Calculator
During the Cyber Monday online sale, compute the discounted price and amount saved from the original price and discount percentage.
輸入資料
計算結果
重點速覽：Saved = original x discount% / 100; final = original - saved (equivalently original x (1 - discount%/100)). Cyber Monday is the Monday after Black Friday, focused on online/electronics/digital discounts. WARNING: single % discount only; watch inflated originals, stacked discounts, shipping, duties, returns, security. Compare with the usual price and buy by need. Education, not advice.
計算公式
省下金額 = 原價 × 折扣百分比 ÷ 100。
折後價 = 原價 − 省下金額。
$$Amount\ saved = Original\ price \times \dfrac{Discount\%}{100}$$$$Final\ price = Original\ price - Amount\ saved$$$$Final\ price = Original\ price \times \left(1 - \dfrac{Discount\%}{100}\right)$$使用說明
- Enter the original price.
- Enter the Cyber Monday discount percentage.
- View the amount saved and final price.
原價固定 HK$800 下，不同網絡星期一折扣百分比對應的省下金額與折後價
| 折扣百分比 | 省下金額 (HK$) | 折後價 (HK$) | 相當於 |
|---|---|---|---|
| 20% | 160.00 | 640.00 | 8 折 |
| 35% | 280.00 | 520.00 | 6.5 折 |
| 40% | 320.00 | 480.00 | 6 折 |
| 50% | 400.00 | 400.00 | 半價 |
理財情境案例
案例一：網絡星期一單次折扣的折後價
一件原價 HK$800 的耳機，網絡星期一減 35%。
省下金額 = 800 × 35% = HK$280；折後價 = 800 − 280 = HK$520。
折後價 HK$520 相當於付原價的 65%（約 6.5 折）。若這款耳機平日實售約 HK$560，則此優惠屬實惠;但若曾在其他促銷見過 HK$530，則差距有限。可見『減 35%』要與真實平日價比較才知是否抵買。
案例二：跨境網購把隱藏成本算進總價
某海外網店原價 HK$800 商品網一減 40%，折後價 = 800 × 0.6 = HK$480；但運費 HK$120、信用卡外幣手續費約 1.5%（480 × 1.5% ≈ HK$7）。
實際總成本 ≈ 480 + 120 + 7 = HK$607。
帳面折後價雖只 HK$480，看似『6 折超值』，但加上運費與手續費後總支出達 HK$607，僅較原價 HK$800 便宜約 24%。若本地商家同款平日售 HK$620，則跨境購買的『優惠』其實所餘無幾。網購務必把折後價、運費、手續費與可能稅費一併加總，再與本地價比較。
常見問題
How is Cyber Monday different from Black Friday, and which is cheaper?
Both are US-origin global shopping events, back-to-back but with different focus. Black Friday (day after Thanksgiving) is known for in-store rushes and all-category markdowns (online now too). Cyber Monday is the following Monday, originally for online shopping, so electronics, software and online-exclusive items often discount deepest. Which is cheaper depends on category and retailer: big appliances/traditional retail may be deeper on Black Friday; electronics/software/online goods may bottom only on Cyber Monday. Some run a whole 'shopping week'. Compare both days' final prices with this tool rather than assuming one is always cheapest.
Beyond the discount, what hidden costs should I watch online?
The 'final price' is rarely the full cost, especially cross-border: (1) shipping — discounts may apply only to the item, shipping extra, or 'free over a threshold' nudges over-buying; (2) duties/taxes — imported parcels may incur customs charges that erase the discount; (3) FX/card fees — foreign-currency settlement may add conversion fees or worse rates; (4) return costs — cross-border returns are often costly/troublesome, lowering your margin for error. Add 'final + shipping + possible duties + FX' before judging true value.
How to tell a real Cyber Monday deal from fake hype?
Track historical prices (note the item's usual price beforehand, or use price-tracking tools to see the historical low); cross-platform compare (one store's 'limited offer' may not be); check the 'original price' basis (list vs actual usual price — the former is often inflated); beware urgency tactics (countdowns, 'only X left') that spur impulse buys. Compute the real final price with this tool, then compare with history and across platforms.
How do discount percentages map to 'folds' (e.g. 八折)?
HK consumers use 'folds' (e.g. 8折 = 80%); overseas stores use '% off'. Rule: amount paid = 100% - discount%; convert to folds. '20% off' = pay 80% = 8折; '35% off' = pay 65% = 6.5折; '50% off' = half price = 5折. Two pitfalls: '50% off' is not free/buy-one-get-one; and 'buy one get one free' is a 50% discount (pay one, get two), not 100%. Enter '% off' directly; no mental conversion needed.
What suits Cyber Monday, and how should HK shoppers plan?
Cyber Monday leans online/digital: electronics (laptops, phones, earbuds, smart home), software/cloud/storage/streaming annual subs (often year-low), game downloads, and online-only brands (deeper discounts, no store overhead). Plan in three steps: (1) list what you truly need/replace and note usual prices as baseline; (2) on the day, compute each final price with this tool and compare to usual; buy only genuinely cheaper-needed items; (3) for cross-border, add shipping, FX fees and possible duties to total cost. Remember, subscription discounts are only worthwhile if you'll use them.
相關工具
參考資料
內容審核：香港計算器財經團隊。計算邏輯與公式參考香港金融管理局（HKMA）及投資者及理財教育委員會（IFEC）之個人理財計算指引，結果僅供參考，實際以相關機構公佈為準。