Know what you calculate.
Velunqra is a free English-language collection of 30 calculators for physical unit conversions. No account is required.
Definitions and scope
Convert through a declared base unit using multiplicative factors. Absolute temperature uses scale offsets and rejects values below absolute zero. US and Imperial liquid measures are explicitly separate; feet and miles are international, pounds and ounces are avoirdupois. The calorie is thermochemical unless labelled otherwise; Btu means International Table (IT). Time years are labelled as fixed 365-day or 365.25-day intervals, not calendar-year computations. Standard gravity is 9.80665 m/s². Specific-heat and conductivity conversions use temperature-interval ratios, not absolute scale offsets. Factors are listed in catalog.json; displayed values are limited to 12 significant digits.
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.
Reference definitions
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.