A new release of RationalCalc is coming soon.
The major change in this update will be Feet / Inch mode and the ability to enter compound measurments, such as 3.5 ft 6 1/2 in.
The functionality is about 90% complete and should be released by January 1st.
Currently, we are working on implementing additional tests to the "Self Test" to ensure that the calculations are correct.
After the Feet / Inch release, the plan is add support for area, i.e. 3 ft x 2 ft = 0.55741824 m2.