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Coupon Campaign Incrementality Calculator

Separate genuinely additional coupon orders from customers who would have bought anyway, then calculate the incremental share needed for recovery.

By PriceAndProfit Editorial Updated

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Fill in the fields: the result appears under the form, with the formula below it.

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Formula and cost boundary

Incremental contribution = redeemed orders × incremental share × original unit contribution − redeemed orders × coupon − campaign cost

The incremental percentage applies to redeemed orders. All redemptions receive the coupon, including purchases that would have happened at full price. Coupon dollars cannot exceed the original price. The cost boundary excludes unchanged overhead. Expected incremental orders can be fractional, while redeemed order count must be whole. A required incremental share above 100% is mathematically unattainable within this model. No-redemption and nonpositive-original-contribution cases have no usable recovery percentage. Enter your own counterfactual estimate; the tool does not infer causality from coupon use.

Worked example: Some redemptions would happen anyway

The following inputs are hypothetical values for checking the calculation. They are not recommended prices, wages, margins or platform charges. Keep the units and period shown in each label when replacing them with your own records.

Inputs for this worked example
InputExample value
Redeemed orders 200 orders
Redeemed orders that are genuinely additional 25%
Original order price $80
Variable cost per order $40
Coupon dollars per redemption $10
Additional campaign cost $500
Outputs from the displayed inputs
ResultCalculated value
Incremental contribution −$500
Total coupon reduction $2,000
Expected additional orders 50 orders
Incremental share needed for recovery 31.25%

Using the result

Save the input set alongside the source date of each quote or cost record. Review the cost boundary before comparing this result with another report: a contribution measure may exclude overhead, and a cash measure follows payment dates. Display rounding does not change the underlying assumptions. Recalculate when an input changes; the tool does not predict future sales or collections.

Are any rates supplied automatically?

No. Numeric fields are your inputs. Example values demonstrate arithmetic only. Check your contracts and records for the amounts that apply to your business.

Why might a result be unavailable or negative?

A missing denominator or inconsistent inputs can make the calculation undefined. Those combinations are rejected or labeled explicitly. A valid negative result remains visible because it may identify a loss or cash shortfall.

Method reference: OpenStax: Relevant Information for Decisions. Checked October 22, 2026. Relevant future cost and counterfactual comparisons; all commercial assumptions are supplied by the user.

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