General commercial sources of converters
- Advanced electronic calculators A calculator is a device that is used for performing mathematical calculations. It differs from a computer by having a limited problem solving ability and an interface optimized for interactive calculation rather than programming. Calculators can be hardware or software, mechanical or electronic, and are often built into devices such as PDAs or have unit-conversion functionality.
- Spreadsheet A spreadsheet is a computer application that simulates a paper worksheet. It displays multiple cells that together make up a grid consisting of rows and columns, each cell containing either alphanumeric text or numeric values. A spreadsheet cell may alternatively contain a formula that defines how the contents of that cell is to be calculated from programs usually provide conversion functions In computer science, a subroutine or subprogram is a portion of code within a larger program, which performs a specific task and is relatively independent of the remaining code or formulas In mathematics and in the sciences, a formula is a concise way of expressing information symbolically (as in a mathematical or chemical formula), or a general relationship between quantities. One of many famous formulae is Albert Einstein's E = mc2 (see special relativity) or the user can write their own.
- Commercial mathematical, scientific and technical applications often include converters.
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