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Promotion Contribution Lift Calculator

Compare the contribution from a discounted campaign with a no-promotion baseline and calculate the volume needed to recover the difference.

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

Contribution lift = promoted orders × [price × (1 − discount) − variable cost] − baseline orders × (price − variable cost) − campaign cost

Both order counts must be whole numbers. The regular price must exceed the specified variable cost so the baseline has positive unit contribution. Every promoted order receives the discount in this model. Baseline orders describe what would have happened without the campaign, not merely last week's count. Recovery volume rounds up to a whole order. If promoted contribution is zero or negative, the tool reports that no positive contribution per promoted order exists instead of inventing a volume threshold. A threshold beyond the exact whole-order numeric range is labeled explicitly. Discounts do not predict demand lift.

Worked example: More orders but lower contribution

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
Orders expected without promotion 100 orders
Orders with promotion 150 orders
Regular price per order $50
Variable cost per order $30
Discount on regular price 20%
Additional campaign cost $100
Outputs from the displayed inputs
ResultCalculated value
Contribution change versus baseline −$600
Promotion contribution after campaign cost $1,400
Whole promotion orders to match baseline 210 orders

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: Break-Even Points in Units and Dollars. Checked October 22, 2026. Contribution and cost-volume-profit relationships; examples are independently constructed.

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