Engineering Unit Conversion Factors

• •Use the Engineering Unit Conversion Factors when solving homework or exam problems that require quick numerical verification of your hand calculations — instant feedback helps identify arithmetic errors before they propagate.
• •Use it during the early design phase to rapidly iterate on parameters and narrow down feasible configurations before committing time to detailed finite element simulations or full design packages.
• •Use it when reviewing a colleague's calculation or checking a vendor's data sheet for plausibility — a quick sanity check can prevent costly downstream errors.
• •Use it to generate reference data for a technical report or presentation without manual computation, ensuring consistent, reproducible numbers throughout the document.
• •Use it in the field when a quick estimate is needed and a full engineering software package is not available.

The Engineering Unit Conversion Factors is a precision engineering calculation tool designed for students, engineers, and technical professionals. Searchable reference of 60+ unit conversion factors across length, mass, force, pressure, energy, power, temperature, volume, flow rate, and torque. Click to copy. All calculations are performed using established engineering formulas from the relevant scientific literature and standards. Inputs support both metric (SI) and imperial unit systems, with unit conversion handled automatically — simply select your preferred unit from the dropdown next to each field. Results are computed instantly in the browser without sending data to a server, ensuring both speed and privacy. This calculator is intended as a supplementary tool for learning and design exploration; always verify results against authoritative references for safety-critical applications.

Conversion constants reference tables list the exact or highly-accurate numerical factors for converting between common units of measurement across engineering disciplines. Examples include length (1 meter = 3.28084 feet = 39.3701 inches), mass (1 kg = 2.20462 pounds = 35.274 ounces), force (1 newton = 0.224809 pound-force), pressure (1 Pa = 0.000145038 psi = 10⁻⁵ bar), energy (1 joule = 0.238846 calorie = 0.737562 foot-pound), power (1 watt = 0.00134102 horsepower = 3.41214 BTU/hr), temperature (K = °C + 273.15, °F = 1.8 × °C + 32). Fundamental physical constants are also tabulated: speed of light c = 299,792,458 m/s, Planck's constant h = 6.62607015 × 10⁻³⁴ J·s, elementary charge e = 1.602176634 × 10⁻¹⁹ C, Avogadro's number N_A = 6.02214076 × 10²³ /mol, Boltzmann constant k_B = 1.380649 × 10⁻²³ J/K, gas constant R = 8.314462618 J/(mol·K), gravitational acceleration g = 9.80665 m/s² (standard value). These constants are used constantly in engineering calculations, unit conversions, and problem solving.

• •Unit conversion: convert values between SI and imperial or customary systems for multinational engineering projects and standards compliance.
• •Physical chemistry and physics calculations: use fundamental constants in equations like PV = nRT, E = hν, or F = ma where unit consistency matters.
• •Homework and exam problems: students rely on conversion factors and fundamental constants as standard reference data for all engineering and science courses.
• •Design calculations: engineers working in the US customary system must convert to SI for international standards or research literature comparisons.
• •Report preparation: technical reports often include both SI and imperial values for accessibility across different audiences.