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Kermit, you already have an extended precision calculator. The Windows
scientific calculator has 32 significant digits. I think this is not
true of the default simple calculator. You must click View and select
the scientific calculator.

For example, here's what it gives for e^1

2.7182818284590452353602874713527

In Windows 8.1 the calculator has a unit conversion function, but that
seems to work in double (not extended) precision. When I convert 57
degrees to radians, it says 0.9948376736367678, which is "only" 16
digits. I copied that and pasted it into the calculator (you can copy
from the calculator and paste into it), divided by pi, multiplied by
180, and got 56.999999999999996628343696709571. So I guess you have to
do the radian conversions via pi and 180 for full accuracy.

   

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