Reporting discrepancy calculator
Compare two reports with an explicit reference and a signed percentage difference.
Align the metric, dates, time zone, filters and export timing first. Report A is the reference throughout this calculation.
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The formula
Signed difference = Report B − Report A
Percentage difference = (Report B − Report A) ÷ Report A × 100
B as a share of A = Report B ÷ Report A × 100
Worked example · sample data
A reports 100,000 and B reports 92,000. B is 8,000 lower, or 8% below A.
Before you use the result
A negative difference means B is lower than A; a positive difference means it is higher. Swapping the reports changes the percentage because the reference changes.
This is a reconciliation convention, not a universal billing formula or an acceptable-discrepancy threshold. Use the campaign agreement for those decisions.
Do not treat a click-versus-session comparison as proof of a tracking error. Those metrics count different events.