Incremental Lift
The percentage increase in a target outcome (sales, conversions, prescriptions) caused by a campaign, isolated from what would have happened anyway via a test/control design.
“How much of this outcome did our marketing actually cause, versus organic demand?”
The true causal contribution of marketing to an outcome, correcting for the fact that some customers would have converted anyway.
Which specific creative, channel, or touchpoint within the campaign drove the lift — incrementality tests measure the campaign as a whole unless designed with sub-arms.
Numerator
Incremental outcomes attributable to exposure
Denominator
Control group baseline outcome rate
Example
Exposed group converts at 4.2%; matched control (public service ad / PSA holdout) converts at 3.5%. Incremental Lift = (4.2% − 3.5%) / 3.5% = 20%.
Recommended visualization: Bar chart: exposed vs. control conversion rate, with confidence interval
Requires a randomized holdout (PSA/ghost ads) or geo-based test design with sufficient statistical power. Underpowered tests will show noisy, non-significant lift — always report confidence intervals alongside the point estimate.
- Confirm the holdout group was truly randomized and not systematically different
- Check sample size against the pre-registered minimum detectable effect
- Verify no cross-contamination between exposed and control groups
- Running an incrementality test with too small a sample to detect realistic effect sizes, then reporting 'no lift' as if that were conclusive
- Confusing last-touch attributed conversions with true incremental conversions — they are not the same number
Get a conversational, stakeholder-friendly explanation of this KPI, generated on demand.