The general-purpose arithmetic, number theory and descriptive statistics tools. The largest topic in the library.
2 tools · all free, all computed in your browser
Arithmetic runs in double-precision floating point, so results beyond about fifteen significant figures are not exact. Where a question wants an exact fraction or surd, keep the exact form rather than a decimal.
Where your institution’s rule differs from the convention a tool uses, your institution is right and the tool is not. These compute; they do not rule.
Calculators are provided for study and planning. Results are not official records, professional advice, or a substitute for your institution's own figures.