Math & Units

The math and units category collects the conversion tools that come up most often outside a calculator: unit conversion across length, mass, temperature, volume, area, speed, and digital storage; GPA calculation on the standard 4.0 scale; exact fraction arithmetic with reduced results; and Roman numeral conversion.

All four run in your browser using exact factor ratios and the proper formulas (a Celsius-to-Fahrenheit conversion is an offset, not a multiplier; digital storage gets both the decimal 1,000-based and binary 1,024-based readings), so results are precise to the displayed precision. The category is intentionally focused — this is a 'how many feet is 100 meters' or 'what is 7/12 + 5/8' set, not a scientific calculator or a CAS. For algebra and symbolic math you want a dedicated tool; for the everyday questions these answer, a single page that handles the right kind of math is exactly what you want.