unit-converter

name	unit-converter
description	Mechanical engineering unit conversion — stress, force, pressure, length, area, moment of inertia, torque, power, temperature, thermal properties, flow rate, viscosity. Imperial ↔ SI ↔ metric.
metadata	{"priority":6,"promptSignals":{"phrases":["convert","unit conversion","imperial to SI","ksi to MPa","psi to","inches to","hp to kW"],"minScore":3}}

Unit Converter — Mechanical Engineering

Always show: original value → converted value with full precision. Show formula used.

Stress / Pressure

1 psi = 6.895 kPa = 0.006895 MPa 1 ksi = 6.895 MPa 1 MPa = 145.0 psi = 0.1450 ksi 1 bar = 0.1 MPa = 14.50 psi 1 atm = 101.325 kPa = 14.696 psi 1 kgf/cm² = 98.07 kPa = 14.22 psi

Force

1 lbf = 4.448 N 1 N = 0.2248 lbf 1 kip = 1000 lbf = 4448 N = 4.448 kN 1 kgf = 9.807 N

Length

1 in = 25.40 mm 1 ft = 0.3048 m = 304.8 mm 1 mm = 0.03937 in 1 m = 39.37 in = 3.281 ft 1 mil = 0.001 in = 0.0254 mm

Area

1 in² = 645.2 mm² = 6.452 cm² 1 ft² = 0.0929 m² 1 mm² = 0.001550 in²

Moment of Inertia (Second Moment of Area)

1 in⁴ = 416,231 mm⁴ = 41.623 cm⁴ 1 mm⁴ = 2.403×10⁻⁶ in⁴ 1 cm⁴ = 0.02403 in⁴

Section Modulus

1 in³ = 16,387 mm³ 1 mm³ = 6.102×10⁻⁵ in³

Moment / Torque / Bending Moment

1 lbf·in = 0.1130 N·m = 113.0 N·mm 1 lbf·ft = 1.356 N·m 1 kip·in = 112.98 N·m = 0.11298 kN·m 1 N·m = 8.851 lbf·in = 0.7376 lbf·ft 1 kN·m = 8851 lbf·in = 737.6 lbf·ft

Power

1 hp = 746 W = 0.746 kW = 550 ft·lbf/s = 33,000 ft·lbf/min 1 kW = 1.341 hp 1 W = 1 N·m/s = 1 J/s

Speed / Angular Velocity

1 rpm = 2π/60 rad/s = 0.10472 rad/s 1 rad/s = 9.549 rpm 1 Hz = 1 cycle/s = 2π rad/s (angular freq ω = 2πf)

Velocity

1 ft/s = 0.3048 m/s = 0.6818 mph 1 m/s = 3.281 ft/s = 3.600 km/h 1 mph = 1.467 ft/s = 0.4470 m/s 1 km/h = 0.2778 m/s

Temperature

°C = (°F - 32) × 5/9 °F = °C × 9/5 + 32 K = °C + 273.15 °R = °F + 459.67

Mass / Weight

1 lbm = 0.4536 kg (mass) 1 lbf = 4.448 N (force; 1 lbm weighs 1 lbf at g=32.174 ft/s²) 1 slug = 14.59 kg (F=ma with lbf and ft/s²) 1 kg = 2.205 lbm 1 tonne (metric) = 1000 kg = 2205 lbm

Thermal Conductivity

1 BTU/(hr·ft·°F) = 1.731 W/(m·K) 1 W/(m·K) = 0.5779 BTU/(hr·ft·°F)

Heat Transfer Coefficient h

1 BTU/(hr·ft²·°F) = 5.678 W/(m²·K) 1 W/(m²·K) = 0.1761 BTU/(hr·ft²·°F)

Heat Flux

1 BTU/(hr·ft²) = 3.155 W/m² 1 W/m² = 0.3170 BTU/(hr·ft²)

Specific Heat

1 BTU/(lbm·°F) = 4187 J/(kg·K) = 4.187 kJ/(kg·K) 1 J/(kg·K) = 2.389×10⁻⁴ BTU/(lbm·°F)

Thermal Resistance

1 °F·hr/BTU = 1.895 K/W 1 K/W = 0.5275 °F·hr/BTU

Viscosity (Dynamic μ)

1 cP (centipoise) = 0.001 Pa·s = 0.001 N·s/m² 1 Pa·s = 1000 cP = 0.6720 lbm/(ft·s) 1 lbm/(ft·s) = 1.488 Pa·s Water at 20°C: μ = 1.002 cP = 0.001002 Pa·s Air at 20°C: μ = 0.0182 cP = 1.82×10⁻⁵ Pa·s

Kinematic Viscosity ν = μ/ρ

1 cSt = 1 mm²/s = 10⁻⁶ m²/s 1 ft²/s = 0.0929 m²/s Water at 20°C: ν = 1.004 cSt = 1.004×10⁻⁶ m²/s Air at 20°C: ν = 15.11 cSt = 15.11×10⁻⁶ m²/s

Flow Rate

1 gpm (US gallon/min) = 6.309×10⁻⁵ m³/s = 0.06309 L/s = 3.785 L/min 1 L/s = 15.85 gpm 1 m³/s = 15,850 gpm = 1000 L/s 1 cfm (ft³/min) = 0.02832 m³/min = 0.4719 L/s

Density

1 lbm/ft³ = 16.018 kg/m³ 1 kg/m³ = 0.06243 lbm/ft³ Water: 1000 kg/m³ = 62.43 lbm/ft³ Steel: 7850 kg/m³ = 490 lbm/ft³ Aluminum: 2700 kg/m³ = 169 lbm/ft³