Buy X get Y free calculator
Enter the item price and the offer terms to compare it with a straight discount and see whether the extra quantity is worth it.
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How to use it
- Enter price per item, buy (items at full price), get (discounted items), discount on those items (100 = free) and number of deals.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Paid = (X × price + Y × price × (1 - Y discount%)) × deals. Effective price = paid ÷ items. Effective discount = 1 - paid ÷ (items × price).
Example
Inputs: Price per item = 30, Buy (items at full price) = 2, Get (discounted items) = 1, Discount on those items (100 = free) = 100 %, Number of deals = 1. Result: Effective discount: 33.33%; Effective price per item: 20.00; You pay: 60.00.
Limits and caveats
- It assumes every item has the same price; some shops make the cheapest item the free one.
- The real saving is smaller if you did not need the extra items.
Questions about this tool
What is buy 2 get 1 free worth?
You pay for 2 and get 3, an effective 33.33% off each item, which is less than a straight 50% off.
And second item half price?
You pay 1.5 prices for 2 items, an effective 25% off, not 50%.
When is the offer worth it?
When you really need all of it or will use it before it expires. Compare the effective price per item with other shops.