Math Tools

Math tools that compute the answers most often looked up in homework, lab notebooks, and back-of-envelope estimates: percentages, ratios, averages (arithmetic, geometric, harmonic) with the summary statistics that go with them, circle and triangle geometry, volumes for common solids, and fraction-decimal conversion with arbitrary repeating-decimal handling. The tools accept mixed input formats (fractions, decimals, percentages, mixed numbers) so you do not have to normalize before typing. Where multiple definitions exist (which mean to use, how to interpret a percentage change against a zero baseline), the tool surfaces the choice rather than guessing. The common misconception that creates the most wrong answers is confusing percentage-of with percentage-change; the percentage tools separate them into distinct modes for that reason. A second is using the arithmetic mean on data that is multiplicative (interest rates, growth factors, returns), where the geometric mean is the right answer, which is why the averaging tools return all three means side by side. If you are new to the category, start with the averaging tools for any dataset, the percentage tools for any pricing or ratio work, and the geometry tools for any homework involving radii and circumferences. The fraction converters handle the conversions kids run into in middle school and the ones engineers run into in tolerances.

12 tools available