What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.

At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.

We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.

  • Profile Image

    Poisson Distribution Calculator

    Asked by strugar on September 13, 2014 at 06:19 AM

    Hi. Has anyone tried to build Poisson calculator? I don't see Poisson function in available functions list, so I wonder what is the easiest way to do the calc. Of course I can build it from the scratch, but I also don't see factoriel function, so it would be painfull process to do entire calc manually...


  • Profile Image
    JotForm Support

    Answered by Welvin on September 13, 2014 at 11:02 AM


    I searched for it, but I've found multiple results. I think it has the same formula, but can you please confirm if it's the same here: http://www.endmemo.com/statistics/poisson.php.

    Thank you!

  • Profile Image

    Answered by strugar on September 13, 2014 at 11:24 AM

    Hi. Thanks for reply!

    Yes, it is the calculator.

    Calculation itself is not the problem, there is a formula and one just needs to follow it; though, as I need about 20 fields, I just wondered if there is an easier way.

    But nevermind, in the meantime, I started building the calculator, you can see it here: http://form.jotformeu.com/form/42325043228345 , I have checked, and it gives the same results as the calculator you mentioned, so it means it works correctly.

    I created one field, and then duplicated it and adjusted formulas isnide, so it's not as difficult as I thought - I did not notice "Duplicate" function in the beginning.

    Thanks for looking into this issue anyway! :)

  • Profile Image
    JotForm Support

    Answered by Welvin on September 13, 2014 at 12:30 PM

    You are welcome and that's great to know! Well, the calculation is perfect :) I would like to clone and share it, can I?


  • Profile Image

    Answered by strugar on September 13, 2014 at 12:41 PM

    Yes, of course you can, you're welcome! You just pay attention to the purpose of calculator - I'm building this one to calculate probability of certain number of goals in football match, based on expected number of goals.

  • Profile Image

    Answered by Peter  on January 10, 2015 at 08:34 AM


    just came accross this... I personally really like the following calculator for poisson distributions: https://www.plotgraphs.com/mathtools/poisson-distribution/ It is straight forward. If you later want to translate the obtained probability in significance level you can also check out the significance calculator there..