KJ kcal Converter

About This Tool

Purpose & User Intent: The tool provides precise unit conversion between kilojoules (kJ) and kilocalories (kcal) to support nutrition planning, energy expenditure estimation, and academic work. Primary users include dietitians, fitness professionals, students, researchers, and anyone needing quick energy-unit translations. When a numeric energy value is input, the tool returns the equivalent value in the chosen target unit with a standard conversion factor.
Core Logic & Features: The tool relies on a fixed, physical conversion: 1 kcal = 4.184 kJ. Required features include accepting a numeric value, selecting source and target units (kJ or kcal), and returning the converted amount with controlled precision. Optional/advanced features include configurable decimal places, handling of both directions in a single input, and robust input validation to reject non-numeric or negative values.
Inputs & Outputs: Inputs include value (number, units: kJ or kcal, sample: 2000) and target unit (kJ or kcal). Outputs include converted_value (number, same numeric type) and units (string). Validation ensures numeric inputs, non-negativity, and finite results.
Algorithms & Calculations: The calculation follows kcal = kJ / 4.184 and kJ = kcal * 4.184. Rounding rules follow a defined precision; results are presented to the requested decimal places when provided. No external data sources are required.
Error & Edge Cases: Non-numeric inputs, missing values, or negative energies are rejected with a clear error state. Very large values use standard floating-point arithmetic with overflow checks as needed. If input is not provided, the tool remains idle and produces no result.
Industry/Region & Localization: Uses SI energy units; supports English-speaking contexts; locale may affect decimal separators if enabled. Currency and regional settings are not relevant; ensure numeric formatting aligns with expected locale.
Assumptions & Exclusions: Assumes standard energy conversion factors; excludes non-energy units or compound-unit conversions; no dietary recommendations are provided.

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