Torque Unit Converter

Purpose & User Intent: This tool solves the problem of converting torque values between Newton-meters (N-m) and foot-pounds (ft-lb) in engineering workflows. It targets mechanical engineers, technicians, designers, quality staff, and students who encounter torque specifications in datasheets, manuals, or validation reports and need quick, accurate cross-unit results. It supports two-way conversion and rapid validation during design reviews or field work.
Core Logic & Features: Core capability is precise torque unit translation using fixed conversion factors. Required features: two-way conversion between N-m and ft-lb, real-time results, numeric validation, and configurable decimal precision. Optional/advanced features: input sign handling for direction, tolerance-aware display, and optional batch-style usage in scripts. The tool enforces the standard 1 N-m = 0.737562149 ft-lb and 1 ft-lb = 1.355817948 N-m. Examples: 100 N-m → 73.7562149 ft-lb; 50 ft-lb → 67.7908974 N-m.
Inputs & Outputs: Inputs include value (number, unit: N-m or ft-lb, allowed signs) and a decimal precision (integer 0–6, default 3). Outputs produce the converted value in the opposite unit, with the requested precision, and a small report of the conversion direction. Validation ensures numeric input and a supported unit; out-of-range magnitudes may trigger precision clamping.
Algorithms & Calculations: The calculation uses exact factors: N-m to ft-lb multiply by 0.737562149; ft-lb to N-m multiply by 1.355817948. Rounding uses standard half-up to the requested decimal places. No unit stacking beyond the two defined units; no power or energy conversions.
Error & Edge Cases: Missing or non-numeric inputs produce a data error and prevent computation. Negative values are allowed to denote direction. Very large values or NaN inputs are rejected or capped to defined precision; identical results occur for symmetric inputs across the two directions. Potential floating precision artifacts are mitigated by fixed rounding.
Industry/Region & Localization: The tool uses SI base units (N-m) and US customary (ft-lb) where appropriate. Default display uses a dot as decimal separator; locale-aware formatting can be added later. Assumes standard engineering notation and torque reporting practices.
Assumptions & Exclusions: Assumes inputs refer to torque, not energy or power. Excludes conversions to non-torque units and unit systems beyond N-m and ft-lb. Does not model material properties or torque safety margins.