Live calculator...help pls

[karukatiaru]

Sorry, I am a total beginner & hope someone can help me or guide me what to read.
My live calculator should look like this. Av Daily Kw, Sun Hours, Cost per W & Rebates will be input manually & the calculater will give the Total Including Installation.
Lets say with example with InPut should look [(InP1/InP2)*1000]*InP3-InP4= my needed output.
Thanks for advance!

[BLiZZaRD]

Just need to make a form, add some JavaScript math functions ( basic math can be found here (http://www.scriptingmaster.com/javascript/performing-basic-math.asp) ) and off you go.

Alternately you can decompile a working calculator like the one found here (http://www.gerd-tentler.de/tools/calculator/) and build your own.

[karukatiaru]

Thx for tips, I did it!