How to test a formula online? I have an equation I have devised, it is:
$$\frac{H+O}{25}+\frac{D}{12970}+\frac{E}{363}+110 = X$$
The equation doesn't matter, I just posted it as an example. I need to be able to plug in values for $H$, $D$, $E$, and then receive what $X$ is. I don't have a graphing calculator, and I was wondering if anyone knew any websites or any way for me to do this?
I have to test it a couple hundred times, and I can't continually input this into my phone's calculator and record on paper my results. I have looked all over the web, but I'm not quite sure the wording that would accurately describe my issue, and therefore I have had no luck finding any information.

As have been suggested already you could use a spreadsheet for example, Google Docs is free and requires less than .5 hour to learn. You could also get into a programming language like JavaScript and do the task it would take you about 2 hours or so. Alternatively you could use this site: Groovy Console that allows you to run Groovy code and execute it for free - Here is the code for your application (I assumed the variables to be decimal type, but you could change the data type to int, float,...etc. based on your requirements). 
Note: The language is case sensitive, so x is not the same as X.

    // My First Groovy Program
    def (double X)=[0.0]

    def (double H)=[2.0]
    def (double O)=[23.0] 
    def (double D)=[0.0] 
    def (double E)=[0.0] 

    X=((H+O)/25)+(D/12970)+(E/363)+110

    printf("X=%f"    ,[X])
    printf(" H=%f"   ,[H])
    ​printf(" O=%f"   ,[O])
    printf(" D=%f"   ,[D])
    printf(" E=%f"   ,[E])

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