Know what you calculate.

Nemorvexa is a free English-language collection of 30 calculators for general mathematics. No account is required.

Definitions and scope

Tools cover percentages, exact bounded fraction arithmetic, ratios, whole-number counting, descriptive statistics and small equation systems. Fraction inputs are bounded so intermediate integer products stay below JavaScript’s safe-integer limit. General numeric results use floating-point arithmetic, so large combinatorial counts are approximate. The number-base converter uses BigInt and is exact for accepted integer digit strings. Population standard deviation uses n; sample standard deviation uses n−1. Weighted means require matching nonnegative weights with a positive total. Quadratics report real roots only; near-singular two-variable systems are flagged instead of reporting an unstable unique answer. No arbitrary expressions or code are executed.

Input and precision limits

Each input has a supported range. Inputs are checked by the calculation engine as well as browser controls. General numeric computations use JavaScript floating-point arithmetic, typically displayed to 12 significant digits. Very large, nonfinite and invalid-domain results are rejected. Display rounding is not a claim of measurement accuracy. The interface identifies undefined results or non-unique solutions instead of inventing a finite answer.

Formulas and examples

Choose any calculator to see its formula, assumptions and an example. Numeric lists accept comma, semicolon or space separation, up to 2,000 entries; additional tool-specific bounds can apply. Use a period as the decimal separator, without thousands separators.

Open source and validation

The implementation and automated checks are included in the source package. Created for this project with AI assistance. No external calculation service, executable expression parser or third-party numeric library is bundled. See the source guide and MIT License.

Appropriate use

These are educational and general-purpose tools. Independently verify any result needed for a safety-critical, regulatory, contractual or scientific measurement decision. The tools do not model uncertainty, propagate measurement error or certify calculations.