Question 1

How does stacked discount compound calculation work?

Accepted Answer

When multiple discounts are stacked, each subsequent markdown is calculated on the already discounted running subtotal, rather than the original MSRP. For example, a 20% sale on a $100 item brings it to $80; an extra 10% coupon then takes 10% off $80 ($8 off), yielding a final price of $72. The true effective discount is 28%, not a naive sum of 30%.

Question 2

How does sales tax apply to discounted items?

Accepted Answer

In most tax jurisdictions, retail sales tax is levied on the net discounted transaction price after seller promotions and coupons are deducted, before adding shipping fees. Our calculator applies sales tax strictly to the discounted subtotal.

Question 3

What is the difference between percent off and fixed cash off coupons?

Accepted Answer

Percent off discounts scale proportionally with price, providing greater dollar savings on higher-ticket items. Fixed cash off coupons (e.g. $15 off $50) provide higher effective percentage savings on lower-priced purchases. Our calculator supports mixing and matching both types seamlessly.

Question 4

Are my shopping cart items or private deal comparisons saved or tracked?

Accepted Answer

Zero data is tracked or saved. All mathematical computations, deal comparisons, CSV exports, and shopping slip renderings occur 100% inside your device’s volatile RAM.

Sale & Discount Savings Calculator

How to Use Sale & Discount Savings Calculator in 3 Simple Steps

100% Client-Side Privacy

Zero-Lag Execution Engine

Frequently Asked Questions