How our calculators work

Each tool implements a stated mathematical formula in JavaScript. Calculations run on your device. Inputs are checked for missing values, supported ranges, and invalid operations before a result is displayed.

Precision

We use standard JavaScript double-precision arithmetic. Display formatting may round results; money commonly displays to two decimal places. Do not treat displayed digits as a guarantee of measurement accuracy. Very large values may lose precision.

Verification

The release includes automated reference cases for every calculator, plus checks for common invalid inputs, zero-interest loans, and calendar boundaries. Automated checks do not establish suitability for every real-world use.

Interpretation

Financial tools model the assumptions you enter. They do not retrieve live rates. The adult BMI tool is an educational screening calculation, not a medical diagnosis. Construction and electrical estimates do not replace professional specifications.

References

• NIST: SI units and conversion guidance
• CDC: adult BMI

Corrections

Found a problem? Use the calculation report and include a reproducible example.