Promotion total
$5.49
Effective price per item
$2.75
Real savings
$5.49 (50.0%)
2 items
Quick answer: A buy-one-get-one-free offer is 50% off only when both items have the same price and you need both. Other BOGO formats require calculating the total cost across every item.
Evergreen method
Measure savings against a clean baseline
A saving is the difference between comparable baskets, not a coupon total or an advertised percentage.
Formula
savings rate = (baseline cost − new cost) ÷ baseline cost × 100Reproducible steps
- 1.Compare the same quantities and quality level.
- 2.Include fees, membership costs and unused products.
- 3.Annualize only after several representative shopping cycles.
Data note — Evergreen model: The formula works with your own inputs and does not depend on a specific price or year.
Related
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