Calculator Plus

From the developer: "Calculator Plus is a window-based Scientific Calculator PLUS a lot more... all of the standard functions such as Tangient, sine, cosine, arcsine, arccosine, arctangent, etc... Calculator plus is also a conversion utility. Convert lengths and distances, temperature, speed, volume, weight, time, area, power, Density, force... even convert Decimal values into fractions. Calculator plus also has a handy Precision setting so you can automatically round your Equation values to the nearest specified decimal places, or round your fraction values to the nearest fractional value specified."