Are you running A/B split tests on your website and need a simple calculator for the results? Unlike some of the other apps out there this app gives the p value to give you more power on which to make decisions, rather than a simple yes or no. If you don't know anything about P values don't worry its really simple if the number is less than 0.05 its significant!

Choose between a one and two-tailed test. Again if you don't know what this means then stick with two-tailed, its very unlikely that you will need one-tailed.

Not only will this calculator help you make better decisions but quoting the P value of a test is far more informative than a simple yes or no.