Reference
Clear, printable reference material. Each page explains its topic, links to the matching calculator and keeps tables readable on small screens.
Sections
- FormulasFormula sheets for percentages, averages, ratios, probability, geometry and speed.
- Conversion TablesPrintable conversion tables for length, weight, temperature, area, volume, speed, time and data.
- Math ReferenceMultiplication table, prime list, fraction and percent charts, roots and symbols.
- MeasurementsMetric prefixes, SI and everyday units, and US vs imperial differences.
Frequently used
- Percentage Formulapart = percent × whole, and its two rearrangements.
- Area FormulasArea formulas for squares, rectangles, triangles, circles, trapezoids and more.
- Length Conversion TablePrintable length conversion tables and factors.
- Temperature Conversion TablePrintable temperature conversion tables and factors.
- Multiplication TableA 12 × 12 times-table grid with patterns that make it easier to learn.
- Roman Numerals ConverterConvert numbers to Roman numerals and back, with rules and a chart.