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BOGO Calculator

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

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.

Shopping results are planning estimates. Check package size, usable quantity, taxes, coupons, shipping, and subscription terms before choosing the better buy.

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

  • Comparing real checkout cost, package value, unit price, rewards, coupons, or recurring spend before buying.
  • Checking whether a lower sticker price still wins after taxes, discounts, waste, storage limits, or usable servings.

Before relying on it

Check first

  • Comparing items with different quality, usable quantity, expiration risk, package units, or tax treatment.
  • Forgetting shipping, deposits, coupons that apply before tax, reward exclusions, or recurring charges.
  • Treating the lowest unit cost as best when storage space, spoilage, brand fit, or actual usage changes value.

Details

What to know before using the result

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

BOGO 50%: 25% off total.

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

BOGO free: 50% off total.

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

Buy 2 get 1: 33.3% off total.

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

Calculator accuracy

Methodology and assumptions

Formula, inputs, limitations and review record
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

Shopping calculators compare visible price assumptions, but real value can change with quality, spoilage, package size, rewards, taxes, shipping, and recurring charges.

Review record

Catalog QA baseline on June 6, 2026. This date marks the catalog-wide automated and editorial QA baseline, not a tool-specific expert review.

Cite this page

Toolkit Shelf. BOGO Calculator. 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.