Order: apply discounts sequentially on the remaining price → subtract coupon → add tax. If your store taxes differently, treat this as an estimate.
Tip: a 20% discount then 10% discount is not 30% off — it’s 28% off (0.8 × 0.9 = 0.72).
Stacked discount calculator — Calculate the real final price when multiple % discounts stack, plus a coupon and tax. Shareable, browser-only.
Example: Use this tool to sanity-check numbers quickly, then share the link if you need to discuss with others.
FAQ: (1) Does it upload my data? No—runs in your browser. (2) Can I share results? Yes—use the share link feature. (3) Is it authoritative? Treat it as a convenience, not professional advice.
疊加折扣計算器 — 多個折扣％疊加到底省多少？再加折價券與稅金，一鍵算出結帳總額與等效折扣。可分享連結、純前端。
範例：用這個工具快速試算與對照結果，需要討論時再把連結分享給對方。
FAQ： (1) 會上傳資料嗎？不會，計算在瀏覽器內完成。 (2) 能分享結果嗎？可以，用分享連結。 (3) 準確嗎？請把它當作便利工具，不是專業建議。