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Buy One Get One Value Calculator

Work out buy one get one value instantly with clear inputs, formula shown and shareable results.

About Buy One Get One Value Calculator

A BOGOF is only a 50% discount if you use both items. Divide the total cost by the units you will actually consume, not the units you receive, and offers on perishables often turn out to be no saving at all.

Formula

Multi-buy value

effective price = total paid / units actually used; headline discount = 1 - paid units / units received

Worked example

With the default values below, Buy One Get One Value Calculator returns Effective price per useful unit of $2.25. Change any input above and every figure here is recalculated in your browser.

Inputs used

Unit price
4.5
Offerone of Buy one get one free, Buy one get one half price, 3 for 2, Buy 2 get 1 free
Buy one get one free
Quantity you actually need
2 units
Will you use the extra?one of Yes, all of it, Only half, No, it will be wasted
Yes, all of it

Results

Effective price per useful unit
$2.25
Total cost
$4.50
Headline discount
50.00% %
Real saving after waste
50.00% %

Step by step

  1. 1Values used
  2. 2Multi-buy value
  3. 3Effective price per useful unit= 2.25
  4. 4Total cost= 4.50
  5. 5Headline discount= 50.00 %
  6. 6Real saving after waste= 50.00 %

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why is 3 for 2 weaker than BOGOF?

3 for 2 is a 33% discount, BOGOF is 50%. Both require you to want the extra units for the discount to be real.

What is the trap with perishables?

Wasting the free item converts a 50% discount into no discount at all, and you have also spent more cash up front.

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