Tristan's Normal Distribution Calculator

This is a calculator for normal distribution related things, just modify one number and all the other numbers will update as you type. Calculations are done with JS double-precision floats, I don't guarantee its accuracy past 7 standard deviations.


Also known as the z-score.


The fraction of things with a value less than the Z-score or X sigma.


The percentage of things with a value less than the Z-score.


One in X things will have a value greater than the threshold.


The Z-score represented as an IQ.

This was hacked together in 2 hours by Tristan Hume, the source is on Github. File an issue or email me with any requests/bugs.