Calculate a promotion’s incremental contribution
Compare campaign and holdout economics using a consistent population.
Make groups comparable
A 1,000-person campaign group produces $2,200 contribution. A comparable 1,000-person holdout produces $1,900. The difference is $300 before extra promotion costs.
Subtract the incremental cost once
If the campaign adds $180 in placement fees, net estimated lift is $120. If discounts are already reflected in the group contribution, do not subtract them again.
Account for timing
Wait for returns and compare the period after the offer. A promotion can shift purchases earlier without increasing total contribution over a longer window.
Try a related tool
Find how many promotional orders you need to match normal-period contribution.
