FrugalCalc

You decide the price - its Pay-What-You-Want.Features a multi-line text-editor type of interface450+ unit conversions built-in with an easy to use interface.Hundreds of functions built-in and ready for use.Save and open your calculation pages with ease.Evaluate built-in and user definable functions, units, constants, and matrices.accurate calculations every time.Calculation Engine:Supports evaluation of complex in-line mathematical expressions;Line referencing (can perform mathematical operations based on previous lines);Evaluation of the Inverse, Prime Factors, and Decimal to Fraction automatically;Ability to solve built-in and user defined functions;Ability to use built-in or user defined constants in mathematical expressions;Standard, Engineering, Scientific, and Financial modes;Tape mode supported for referring to the previous line when performing mathematical operations;All types of Trigonometric functions built-in with Radian and Degree modes;Supports calculating and working with imaginary numbers in Rectangular, Polar, or Rectangular Sum modes;Evaluation of mathematical expressions in number bases 2 - 16 (decimal: 10 is the default);Evaluation of mathematical expressions in different numbers bases (2 - 16) at the same time;Ability to dynamically change the number of Significant Figures used for displayMathematical Operations supported: +, -, *, /, ^, !, , i.

File I/O:Ability to Save CalcPages;Ability to Open CalcPages;Ability to Print Calc Pages (includes Print Preview).Unit Conversions:450+ commonly used built-in unit conversions;Ability to create user-defined units for use in unit conversions;Base Number conversions (any number base 2 - 16).Additional Features:Matrix Math, Periodic Table, Spreadsheets, Statistics.