Unit Converter

The tool provides fast, offline unit conversions on iOS. It solves the need for reliable cross-unit calculations when network access is restricted or privacy is a concern. Typical users include students, engineers, technicians, researchers, and travelers who encounter measurements in different units and require quick verification or calculations in the field.

Core Logic & Features: Domain capabilities cover multiple measurement categories (length, mass, volume, area, temperature, energy, speed, and more). Required features: an offline unit database, a base-unit conversion model per category, multi-field inputs (value, from_unit, to_unit, category), and precise numerical output with locale-aware formatting. Advanced features: configurable decimal precision, optional custom-unit definitions for highly specialized domains, and straightforward data export for integrations. The tool uses a canonical base unit per category (e.g., meter for length, kilogram for mass) and converts input to base, then from base to target.

Algorithms & Calculations: For non-temperature categories, conversion uses: value_in_base = value * factor_to_base; result = value_in_base / factor_to_base_of_to_unit. For temperature, proper offsets are applied (C ↔ F ↔ K) before standard scaling. All factors are stored offline and updated via periodic data packs to avoid runtime network calls. Edge cases handle zero, negative numbers where allowed, and extremely large values with overflow guards.

Error & Edge Cases: Invalid or unknown units, missing inputs, or mismatched category-unit pairs produce clear domain errors without UI messaging. Extremely large or small values trigger overflow/underflow guards. Locale conflicts (decimal separators) are resolved by enforcing a standard internal representation and formatting at output.

Industry/Region & Localization: Uses SI as default base across categories; supports locale-aware decimal and thousands separators; temperature uses Celsius/Kelvin semantics; no currency conversions are performed.

Assumptions & Exclusions: Assumes use-case is measurement unit conversion only; excludes currency conversions, compound units, or domain-specific properties beyond base units; offline operation is assumed; data is versioned via packs.