Toolkit Shelf

Everyday Calculators

BOGO Calculator

Use this BOGO calculator for buy-one-get-one-free, buy-two-get-one, and similar retail promotions.

Reviewed May 25, 2026EstimateFormula shown

Quick answer

BOGO Calculator: what it calculates

BOGO Calculator calculates effective unit price from regular item price, items received and items paid for. The core method is Effective unit price = (regular price x items paid for - coupon) / items received.

ResultEffective unit price
InputsRegular item price, Items received, Items paid for, Coupon
FormulaBOGO formula

Live calculator

BOGO

Effective unit price$6.00

Before estimated sales tax.

Effective discount50.0%

$12.00 before-tax savings.

Checkout total$12.90

$0.90 estimated tax included.

Formula

BOGO formula

Effective unit price = (regular price x items paid for - coupon) / items received

This flexible setup works for BOGO free, buy two get one, and other multi-buy offers.

How to use

Steps

  1. Enter the regular item price.
  2. Enter how many items you receive.
  3. Enter how many items you pay for.
  4. Add any extra coupon and tax rate if needed.

Example

Sample calculation

Regular item price$12
Offer2 received, 1 paid for
Effective unit price$6 before tax

Calculator use

Best for

  • Quick effective unit price from regular item price, items received and items paid for.
  • Quick everyday math with the result and formula in one place.
  • Shopping, date, time, unit, school, or household comparisons.
  • A fast check before moving the numbers into a spreadsheet.

Before relying on it

Check first

  • Entering regular item price, items received and items paid for from different time periods or scenarios.
  • Mixing units, dates, or original values across the same calculation.
  • Rounding early and then using the rounded number in another step.
  • Copying a result without checking whether the inputs match the real-world question.

Details

What to know before using the result

These notes make the assumptions explicit, especially where the same search query can mean slightly different things.

Flexible offerAny multi-buy deal

For buy two get one, enter 3 items received and 2 items paid for.

Coupon stackSubtract fixed coupon

Add a fixed coupon only if it applies to the offer under store rules.

Effective discountSavings / regular total

The effective discount shows the real percent off across all items received.

Source notes

References used for this calculator

OpenStaxCovers percent applications used for effective discount and savings math.

Benchmarks

How to read the result

The calculator is a decision aid, not a fixed rule. Use the output to compare scenarios and document your assumptions.

BOGO 50%25% off total

Buying two items with the second half off is effectively 25% off both items.

BOGO free50% off total

Buying one and getting one free is effectively half off if both items are same price.

Buy 2 get 133.3% off total

Three same-price items for the price of two is one-third off.

Calculator accuracy

Methodology and assumptions

The formula, inputs, example, and limitations are shown so the result is checkable, not just a number in a box.

Formula

Effective unit price = (regular price x items paid for - coupon) / items received

Inputs used

Regular item price, Items received, Items paid for, Coupon

Limitations

Results are estimates for quick planning and should be checked before important financial, legal, tax, health, or business decisions.

Last reviewed

May 25, 2026

Cite this page

Toolkit Shelf. BOGO Calculator. Retrieved May 25, 2026, from https://toolkitshelf.com/tools/bogo-calculator

FAQ

Common questions

How do I calculate a BOGO deal?

Multiply regular price by items paid for, subtract coupons, then divide by items received.

What is the effective discount for buy one get one free?

If both items have the same price, buy one get one free is effectively 50% off the pair.

Can I use this for buy two get one free?

Yes. Enter 3 items received and 2 items paid for.