BOGO margin calculator for buy two get one 50% off

Last updated: 2026-07-31

Written and reviewed by Seller Profit Guard Editorial Team.

A buy-two-get-one-50%-off offer collects two full prices plus half the reward price while fulfilling three retained-order units. At USD 30 and the same 100-order packet, revenue is USD 6,750 and contribution is USD 3,200; covering all placed-order rewards uses 83.33% of inventory.

buy-two-get-one-half-off packet separating paid units, reward units, collected revenue, fulfilled cost, target headroom, and decision — This original diagram explains a three-unit partial-reward contribution decision with synthetic aggregates.

Define 2 + 1 at 50% off

Two units remain full price and one reward unit receives a 50% discount. In the buy-two-get-one-half-off packet, record the value, unit, denominator, source version, evidence date, maturity state, owner, reviewer, and uncertainty. Recalculate from a clean aggregate or synthetic packet before formatting any rate, amount, boundary, or decision.

Do not model the reward as free. Topic 1 keeps one supported case, one defective case, the correction step, and the reason the conclusion belongs to a three-unit partial-reward contribution decision rather than a platform promise, demand forecast, or universal promotion rule.

Keep comparison scope fixed

Use the same 100 placed orders, 90% retained rate, currency, period, unit price, and per-order costs. In the buy-two-get-one-half-off packet, record the value, unit, denominator, source version, evidence date, maturity state, owner, reviewer, and uncertainty. Recalculate from a clean aggregate or synthetic packet before formatting any rate, amount, boundary, or decision.

This is a structural comparison, not a demand forecast. Topic 2 keeps one supported case, one defective case, the correction step, and the reason the conclusion belongs to a three-unit partial-reward contribution decision rather than a platform promise, demand forecast, or universal promotion rule.

Collect USD 75 per retained order

Two paid units contribute USD 60 and the half-price reward contributes USD 15. In the buy-two-get-one-half-off packet, record the value, unit, denominator, source version, evidence date, maturity state, owner, reviewer, and uncertainty. Recalculate from a clean aggregate or synthetic packet before formatting any rate, amount, boundary, or decision.

Regular merchandise value is USD 90. Topic 3 keeps one supported case, one defective case, the correction step, and the reason the conclusion belongs to a three-unit partial-reward contribution decision rather than a platform promise, demand forecast, or universal promotion rule.

Cost three fulfilled units

Multiply 270 retained fulfilled units by USD 9 product cost. In the buy-two-get-one-half-off packet, record the value, unit, denominator, source version, evidence date, maturity state, owner, reviewer, and uncertainty. Recalculate from a clean aggregate or synthetic packet before formatting any rate, amount, boundary, or decision.

The higher basket adds product cost before any conversion claim. Topic 4 keeps one supported case, one defective case, the correction step, and the reason the conclusion belongs to a three-unit partial-reward contribution decision rather than a platform promise, demand forecast, or universal promotion rule.

buy-two-get-one-half-off packet: cost three fulfilled units — This original diagram makes a three-unit partial-reward contribution decision reviewable.

Apply unchanged order costs

Keep packaging, fulfillment, shipping, percentage fees, fixed fees, adverse loss, and setup transparent. In the buy-two-get-one-half-off packet, record the value, unit, denominator, source version, evidence date, maturity state, owner, reviewer, and uncertainty. Recalculate from a clean aggregate or synthetic packet before formatting any rate, amount, boundary, or decision.

Reprice them if the three-unit parcel changes actual evidence. Topic 5 keeps one supported case, one defective case, the correction step, and the reason the conclusion belongs to a three-unit partial-reward contribution decision rather than a platform promise, demand forecast, or universal promotion rule.

Read the effective 16.67% discount

USD 15 reward discount divided by USD 90 regular value produces the whole-order discount. In the buy-two-get-one-half-off packet, record the value, unit, denominator, source version, evidence date, maturity state, owner, reviewer, and uncertainty. Recalculate from a clean aggregate or synthetic packet before formatting any rate, amount, boundary, or decision.

It is not a 50% whole-order discount. Topic 6 keeps one supported case, one defective case, the correction step, and the reason the conclusion belongs to a three-unit partial-reward contribution decision rather than a platform promise, demand forecast, or universal promotion rule.

Read USD 3,200 contribution

Compare the result and target headroom with the free-reward scenario. In the buy-two-get-one-half-off packet, record the value, unit, denominator, source version, evidence date, maturity state, owner, reviewer, and uncertainty. Recalculate from a clean aggregate or synthetic packet before formatting any rate, amount, boundary, or decision.

The result does not prove equal redemption or basket demand. Topic 7 keeps one supported case, one defective case, the correction step, and the reason the conclusion belongs to a three-unit partial-reward contribution decision rather than a platform promise, demand forecast, or universal promotion rule.

Cost and outcome maturity control: bogo margin for buy two get one 50% off

Close product, fulfillment, parcel, fee, refund, return, dispute, and recovery windows. Control 1 names the authority, owner, review frequency, exception code, threshold, expiry, correction trigger, and prior restorable offer packet.

Provisional evidence stays visibly provisional. Apply the control specifically to a three-unit partial-reward contribution decision; distinguish official platform behavior, seller configuration, seller records, calculator formulas, estimates, and scenario assumptions.

Reward-inventory control: bogo margin for buy two get one 50% off

Keep required reward units, available units, committed units, reserve floor, maximum utilization, replenishment, and fulfillment capacity visible. Control 2 names the authority, owner, review frequency, exception code, threshold, expiry, correction trigger, and prior restorable offer packet.

A scenario result never reserves inventory. Apply the control specifically to a three-unit partial-reward contribution decision; distinguish official platform behavior, seller configuration, seller records, calculator formulas, estimates, and scenario assumptions.

Privacy and access control: bogo margin for buy two get one 50% off

Use aggregates, synthetic fixtures, redacted pointers, access limits, retention rules, and deletion rules. Control 3 names the authority, owner, review frequency, exception code, threshold, expiry, correction trigger, and prior restorable offer packet.

Exclude buyer, order, payment, coupon, credential, token, and OAuth data. Apply the control specifically to a three-unit partial-reward contribution decision; distinguish official platform behavior, seller configuration, seller records, calculator formulas, estimates, and scenario assumptions.

buy-two-get-one-half-off packet: privacy and access control: bogo margin for buy two get one 50% off — This original diagram makes a three-unit partial-reward contribution decision reviewable.

Offer-mechanics control: bogo margin for buy two get one 50% off

Keep platform-defined Buy X Get Y behavior, seller configuration, and calculation assumptions in separate evidence columns. Control 4 names the authority, owner, review frequency, exception code, threshold, expiry, correction trigger, and prior restorable offer packet.

A tool result cannot prove that a marketplace supports the offer. Apply the control specifically to a three-unit partial-reward contribution decision; distinguish official platform behavior, seller configuration, seller records, calculator formulas, estimates, and scenario assumptions.

Release and restoration control: bogo margin for buy two get one 50% off

Require calculation, content, similarity, SEO, image, browser, mobile, privacy, live, and rollback evidence. Control 5 names the authority, owner, review frequency, exception code, threshold, expiry, correction trigger, and prior restorable offer packet.

Restore on formula, route, source, privacy, accessibility, or health regression. Apply the control specifically to a three-unit partial-reward contribution decision; distinguish official platform behavior, seller configuration, seller records, calculator formulas, estimates, and scenario assumptions.

Define 2 + 1 at 50% off: BOGO scenario drill

Recreate “Define 2 + 1 at 50% off” from the synthetic 1 + 1 free and 2 + 1 half-off fixtures. Two units remain full price and one reward unit receives a 50% discount. Change one supported input, preserve the original packet, show the collected-revenue and fulfilled-cost bridge, and attach the expected Block, Review, or Ready state to the buy-two-get-one-half-off packet.

Do not model the reward as free. Drill 1 includes a supported offer, below-target case, invalid case, corrected case, product-cost change, parcel-cost change, and reward-discount change. Explain what moved, what remained fixed, which threshold changed, and what evidence permits the next step.

Keep comparison scope fixed: BOGO scenario drill

Recreate “Keep comparison scope fixed” from the synthetic 1 + 1 free and 2 + 1 half-off fixtures. Use the same 100 placed orders, 90% retained rate, currency, period, unit price, and per-order costs. Change one supported input, preserve the original packet, show the collected-revenue and fulfilled-cost bridge, and attach the expected Block, Review, or Ready state to the buy-two-get-one-half-off packet.

This is a structural comparison, not a demand forecast. Drill 2 includes a supported offer, below-target case, invalid case, corrected case, product-cost change, parcel-cost change, and reward-discount change. Explain what moved, what remained fixed, which threshold changed, and what evidence permits the next step.

Collect USD 75 per retained order: BOGO scenario drill

Recreate “Collect USD 75 per retained order” from the synthetic 1 + 1 free and 2 + 1 half-off fixtures. Two paid units contribute USD 60 and the half-price reward contributes USD 15. Change one supported input, preserve the original packet, show the collected-revenue and fulfilled-cost bridge, and attach the expected Block, Review, or Ready state to the buy-two-get-one-half-off packet.

Regular merchandise value is USD 90. Drill 3 includes a supported offer, below-target case, invalid case, corrected case, product-cost change, parcel-cost change, and reward-discount change. Explain what moved, what remained fixed, which threshold changed, and what evidence permits the next step.

Cost three fulfilled units: BOGO scenario drill

Recreate “Cost three fulfilled units” from the synthetic 1 + 1 free and 2 + 1 half-off fixtures. Multiply 270 retained fulfilled units by USD 9 product cost. Change one supported input, preserve the original packet, show the collected-revenue and fulfilled-cost bridge, and attach the expected Block, Review, or Ready state to the buy-two-get-one-half-off packet.

The higher basket adds product cost before any conversion claim. Drill 4 includes a supported offer, below-target case, invalid case, corrected case, product-cost change, parcel-cost change, and reward-discount change. Explain what moved, what remained fixed, which threshold changed, and what evidence permits the next step.

buy-two-get-one-half-off packet: cost three fulfilled units: bogo scenario drill — This original diagram makes a three-unit partial-reward contribution decision reviewable.

Apply unchanged order costs: BOGO scenario drill

Recreate “Apply unchanged order costs” from the synthetic 1 + 1 free and 2 + 1 half-off fixtures. Keep packaging, fulfillment, shipping, percentage fees, fixed fees, adverse loss, and setup transparent. Change one supported input, preserve the original packet, show the collected-revenue and fulfilled-cost bridge, and attach the expected Block, Review, or Ready state to the buy-two-get-one-half-off packet.

Reprice them if the three-unit parcel changes actual evidence. Drill 5 includes a supported offer, below-target case, invalid case, corrected case, product-cost change, parcel-cost change, and reward-discount change. Explain what moved, what remained fixed, which threshold changed, and what evidence permits the next step.

Read the effective 16.67% discount: BOGO scenario drill

Recreate “Read the effective 16.67% discount” from the synthetic 1 + 1 free and 2 + 1 half-off fixtures. USD 15 reward discount divided by USD 90 regular value produces the whole-order discount. Change one supported input, preserve the original packet, show the collected-revenue and fulfilled-cost bridge, and attach the expected Block, Review, or Ready state to the buy-two-get-one-half-off packet.

It is not a 50% whole-order discount. Drill 6 includes a supported offer, below-target case, invalid case, corrected case, product-cost change, parcel-cost change, and reward-discount change. Explain what moved, what remained fixed, which threshold changed, and what evidence permits the next step.

Read USD 3,200 contribution: BOGO scenario drill

Recreate “Read USD 3,200 contribution” from the synthetic 1 + 1 free and 2 + 1 half-off fixtures. Compare the result and target headroom with the free-reward scenario. Change one supported input, preserve the original packet, show the collected-revenue and fulfilled-cost bridge, and attach the expected Block, Review, or Ready state to the buy-two-get-one-half-off packet.

The result does not prove equal redemption or basket demand. Drill 7 includes a supported offer, below-target case, invalid case, corrected case, product-cost change, parcel-cost change, and reward-discount change. Explain what moved, what remained fixed, which threshold changed, and what evidence permits the next step.

What a three-unit partial-reward contribution decision can and cannot prove

It can prove that entered aggregate assumptions follow the declared dated offer mechanics, distinct paid and reward quantities, order grain, regular-price basis, retained outcomes, fulfilled costs, fee bases, adverse loss, setup cost, reward inventory, thresholds, confirmations, formula version, and evidence scope.

It cannot prove platform eligibility, checkout behavior, lawful price display, live inventory reservation, demand, redemption, conversion, product mix, buyer behavior, incrementality, accounting profit, liquidity, tax treatment, or future campaign results.

Block, review, release, and restore the buy-two-get-one-half-off packet

Block non-finite numbers, duplicate scenarios, invalid dates, missing confirmations, private exposure, missing mechanics, incompatible periods, stale scope, or declared conflicts. Review a valid scenario below target or above its reward-inventory threshold. Ready means both structures preserve the declared contribution and inventory controls.

Release only a reversible public model with synthetic defaults, first-party sources, original diagrams, accessible labels, self-canonical, Article and Breadcrumb schema, contextual links, strict 404 behavior, correction policy, and rollback evidence.

Sources and further reading

Seller Profit Guard methodology: Evidence versions, formulas, privacy, correction, release, and rollback.
Seller Profit Guard data privacy: Local-first boundaries for buyer, order, promotion, payment, credential, and raw-record data.
Shopify Help: Buy X get Y discounts: Official qualifying quantity, reward quantity, discounted value, cart-addition, inventory, channel, uses, combination, and timing rules. Reviewed July 31, 2026.
Shopify Help: Combining discounts: Official application order, best-discount selection, plan-specific same-item rules, and Buy X Get Y combination limits. Reviewed July 31, 2026.
Etsy Help: Set up sales and discounts: Official sales, promo-code, discounted-bundle, highest-discount, and non-stacking context. Reviewed July 31, 2026.
FTC: Unfair or Deceptive Fees FAQ: United States guidance says a BOGO-adjusted total price follows only after the transaction meets promotion requirements. Reviewed July 31, 2026.

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Next step: Open Seller Profit Guard.

This is operational planning help, not tax, accounting, legal, financial, or platform-policy advice. Review the Terms and disclaimer, and verify current platform rules and fee assumptions before changing prices.