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Did the change help?

Compare clicks, enquiries, or another count before and after a website change. Keep the evidence alongside the number.

Read the measurement guide

Define the comparison.

Use the same metric, source, and audience in both windows. Enter counts, such as qualified enquiries, rather than percentages.

Before the change
After the change

This calculator processes these fields in your browser. The calculation does not send them to our server. Both start and end dates count as full days.

Evidence first

A result you can revisit.

Your comparison will appear here, including the dates, data source, audience, and calculation. Start with real totals from your own reports.

Choose windows that represent the same audience and business cycle. Per-day averages adjust for different lengths; they do not remove weekday or seasonal effects.