Unit Converter

Purpose & User Intent: The tool provides precise, immediate unit conversions across standard measurement domains. It serves engineers, scientists, technicians, educators, students, and analysts who need to translate a numeric value from one unit to another for design calculations, data interpretation, or classroom demonstrations. Use cases include selecting a category (length, mass, volume, temperature) and converting between compatible units to verify dimensional consistency or prepare inputs for simulations.
Core Logic & Features: Supported categories include length, mass, volume, temperature, area, speed, energy, and force. Required inputs are a numeric value, a source unit, and a target unit; an optional category narrows unit sets. Advanced features may include custom unit definitions, high-precision output, and batch conversions. The system enforces dimensional consistency and uses correct handling of offsets for temperature conversions (C↔F, C↔K).
Inputs & Outputs: Inputs: value (number), from_unit (string), to_unit (string), category (string, optional), precision (integer, optional, default 2). Outputs: converted_value (number), unit (string). Validation ensures numeric input; units must be recognized; errors are reported to avoid silent miscalculations.
Algorithms & Calculations: For linear and non-temperature categories, the flow is to convert input to a base unit using a factor (value_in_base = value × factor_from_unit_to_base); then convert from base to target (result = value_in_base ÷ factor_to_unit). Temperature uses offsets: Fahrenheit = Celsius × 9/5 + 32; Celsius = Kelvin − 273.15. Rounding respects the specified precision.
Error & Edge Cases: Unknown unit, missing inputs, or category conflicts trigger explicit errors. Very large or tiny values may require scientific notation; conversion between incompatible categories is disallowed. If an input unit is not supported in the selected category, the tool returns an error rather than attempting a guess. External data sources are not used.
Industry/Region & Localization: Follows SI-first conventions where applicable; standard decimal point; supports common imperial units. Output uses the chosen precision and plain numeric formatting. No currency or time-zone context is applied unless explicitly defined by category.
Assumptions & Exclusions: Assumes standard, well-defined unit definitions; excludes currency, data size units, or nonstandard/custom units unless defined; does not perform compound unit operations like speed×time without explicit category support; not a calculator for complex dimensional analysis beyond predefined categories.