Free CRO-Content Tool
Free Statistical Significance Calculator — Run the numbers in seconds with clear, plain-English results. No signup, no spreadsheets.
Someone hands you a statistical significance figure and you're not sure it's right. Drop the inputs into the Statistical Significance Calculator to confirm before you act on it.
Capture today's statistical significance so you have an honest comparison point when you measure results later.
Try optimistic and conservative inputs to see the range of statistical significance you could realistically land in, not just the headline number.
Show the inputs and the math so the statistical significance you're proposing isn't taking on faith. Stakeholders can poke at it before they sign off.
A statistical significance calculator tells you whether the difference between two A/B test variants is real or could be noise, using a z-test or chi-square test. Enter visitors and conversions for control and variant to see the p-value and confidence level.
The numbers stay on this page. Screenshot the result, or copy the inputs and answer into a doc to share it with a teammate or client.
Just the values shown in the form above. Each field is labeled in plain English so you don't need to look up what to enter.
Yes. The Statistical Significance Calculator output is suitable for proposals, QBRs, and forecasts. We recommend always showing the inputs alongside the number so the client can see how it was built.
Yes. No signup, no limits, no email gate. Use the Statistical Significance Calculator as often as you need.
No. This tool runs entirely in your browser. Nothing you enter is sent to a server, saved, or shared with anyone.
Please do. We're happy for marketers, agencies, and educators to link to this page so their readers can use the Statistical Significance Calculator here.
Want an agency that hits the numbers this tool helps you measure? Suff Digital Conversion Rate Optimization