Engineering Unit Converter provides deterministic conversion factors across 13 engineering dimensions including force, pressure/stress, torque, length, mass, and energy. All conversion factors are exact NIST SP811 and ISO 80000-1 certified reference values: Value_target = Value_source × (Factor_source / Factor_target).
Convertidor de Unidades de Ingeniería
Convierta entre unidades SI e imperiales de ingeniería para fuerza, presión, par, longitud, masa, temperatura, potencia y energía. Constantes de conversión exactas del NIST. Instant precision unit conversions for mechanical, civil, aerospace, and structural engineering workflows.
Supported Mechanical & Structural Engineering Units
Force Conversion
Newton (N), Kilonewton (kN), Pound-force (lbf), Kilogram-force (kgf), Dyne (dyn), Kip (1,000 lbf).
1 lbf = 4.448222 N
Pressure & Stress Conversion
Pascal (Pa), Megapascal (MPa), Gigapascal (GPa), Bar, Psi (lb/in²), Ksi (1,000 psi), Atmosphere (atm).
1 MPa = 145.0377 psi
Torque & Moment Conversion
Newton-meter (N·m), Pound-foot (lbf·ft), Pound-inch (lbf·in), Ounce-inch (ozf·in), Kilogram-force meter (kgf·m).
1 N·m = 8.850746 lbf·in
Length & Distance
Millimeter (mm), Centimeter (cm), Meter (m), Inch (in), Foot (ft), Yard (yd), Micrometer (µm), Thou/Mil (0.001 in).
1 in = 25.4 mm (exact)
Mass & Weight
Gram (g), Kilogram (kg), Metric Ton (t), Pound-mass (lb), Ounce (oz), Slug, Short Ton (US).
1 lb = 0.45359237 kg (exact)
Power & Energy
Watt (W), Kilowatt (kW), Horsepower (hp mechanical = 745.7 W), Joule (J), Kilojoule (kJ), BTU, Foot-pound (ft·lbf).
1 hp = 745.6999 W
Standards Verification
All conversion factors adhere strictly to NIST Special Publication 811 (Guide for the Use of the International System of Units) and ISO 80000-1:2022 (Quantities and units). Display precision supports up to 10 significant figures with zero floating-point accumulation errors.
Worked Engineering Conversion
Torque Conversion Example: Convert 120 N·m tightening torque to lbf·in.T = 120 N·m × (1 / 0.112984829) ≈ 1,062.09 lbf·in (88.51 lbf·ft)
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Frequently Asked Questions
What conversion standards does this calculator use?
All conversions follow NIST SP811 and ISO 80000-1:2022. Standard conversion constants (such as 1 inch = 25.4 mm, 1 lb = 0.45359237 kg) are exact mathematical definitions.
What engineering dimensions are supported?
13 primary dimensions: Length, Mass, Area, Volume, Force, Pressure / Stress, Torque / Moment, Power, Speed / Velocity, Angular Velocity, Temperature, Energy, and Flow Rate.
Is temperature conversion exact?
Yes. Temperature conversions apply the exact thermodynamic affine transformations: °F = °C × 9/5 + 32, K = °C + 273.15, and °R = °F + 459.67.
Can I convert between SI and Imperial structural units?
Yes. The calculator fully supports structural units including MPa ↔ psi / ksi, kN ↔ lbf / kip, and N·m ↔ lbf·in / lbf·ft.
How many significant figures are displayed?
Calculations are evaluated using IEEE 754 64-bit precision and formatted up to 10 significant digits without premature intermediate rounding.