➗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 Calculator separates 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 Average Calculator returns all three means side by side. If you are new to the category, start with the Average Calculator for any dataset, the Percentage Calculator for any pricing or ratio work, and the Circle Calculator for any geometry homework involving radii and circumferences. The Fractions Decimals Calculator handles the conversions kids run into in middle school and the ones engineers run into in tolerances.

10 tools available