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The real math behind every promotion — worked examples you can verify with a calculator, and compare directly with ours.
How to Calculate a Discount Percentage Off, Fast
The one-line formula that turns any sticker price into the real total — plus mental-math tricks for the register.
Is Your BOGO Deal Actually Saving You Money?
Buy-one-get-one looks unbeatable. Here is when it is a real half-price bargain and when it quietly empties your cart.
Stacked Discounts: Why 20% Plus 10% Equals 28%
Sequential discounts do not add up. See exactly why 20% followed by 10% saves 28%, not the 30% the sign implies.
Buy 1 Get 1 Free vs Second 50% Off: Unit Price
A side-by-side unit-price breakdown of BOGO, buy-two-get-one, and second-half-off across the quantities you actually buy.
Spend $100 Save $20: Your Real Discount Rate
Why a spend-and-save offer is 20% at the marker but only 11% at $180 — and how to top up to the next threshold.