Call me lazy, but I'm getting a bit tired of having to think about 
things that a smart calculator should be able to deal with for me.

My peeve today?  Multiplying 2.2M(ohm) and 47p(F).  Then having to count 
the zeros in the result to figure out what decade the result is in.  Add 
this to the fact that the windows calculator seems to be the easiest for 
me to find usually and it won't do exponents in nice 3,6,9,12 
increments, or even comma delimit right of the decimal point.  There's 
been more than once that I've got the wrong component value just because 
of being off a decade after calculating a capacitor value which was in 
the pF range and either miscounting one of the 12 digits or interpreting 
22e-11 as 2.2pF instead of 220pF.

Ohms law is another peeve.  Sure, for things I normally do it's pretty 
easy since I have the formula in my head (excluding any unit issues).  
But when I use a pair of values that I don't normally use it gets to be 
a pain.   IE Voltage from Watts and resistance.  (Use algebra to derive 
a real fomula from E=IR and P=EI or look up the formula, then play the 
entire units game again). 

And then theres the whole untit conversion thing.  mm to inches.  C to 
F. dBm to mW, etc.

I know there are a lot of electronic calculators out there.  It seems 
that most of which are oriented towards knowing all of the funky 
formulas to do things like filter design and  network analysis.  Most of 
these get caught up in the formulas and don't deal with what I am 
complaining about.  I really just want something which understands SI 
units in both entry and displays, and has a few common formulas (ohms 
law, C/F and In/CM conversions, etc) and possibly the ability to enter 
my own formulas.

So, before I get really irritated and just write one myself, I figured 
I'd ask if there was a tool which already exists that is a) simple to 
use and b) works for the most common math tasks that an EE does.

Ideas?

-forrest
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