Flow Rate – Velocity for HVAC Calculator
CFM → Velocity (HVAC)
Compute air velocity from airflow and duct size. Includes unit converters. Formula: V = Q / A.
tCFD-Pre (STL editor for OpenFOAM pre-processing)
Click selects a connected flat face patch
Density Unit Converter Calculator
Density Unit Converter
Convert between kg/m³, g/cm³, g/mL, kg/L, g/L, mg/m³, kg/dm³, t/m³, lb/ft³, lb/in³, slug/ft³, lb/gal (US), and lb/gal (UK). Base: kg/m³.
Diffusivity (Mass / Thermal) Unit Converter Calculator
Diffusivity Converter
Choose a basis (Mass diffusivity D or Thermal diffusivity α) and convert between common units. Base: m²/s.
Mass diffusivity (D)
Thermal diffusivity (α)
Thermal Conductivity Unit Converter Calculator
Thermal Conductivity Unit Converter
Convert between W/(m·K), W/(m·°C), kW/(m·K), W/(cm·K), W/(mm·K), Btu/(h·ft·°F), Btu/(h·in·°F), kcal/(h·m·°C), and cal/(s·cm·°C). Base: W/(m·K).
Conductivity (Electrical) Unit Converter Calculator
Electrical Conductivity Unit Converter
Convert between S/m, mS/m, µS/m, S/cm, mS/cm, µS/cm, and S/mm. Base: S/m.
Conductance Unit Converter Calculator
Conductance Unit Converter
Convert between S, mS, µS, nS, pS, kS, MS, and GS. Base: siemens (S).
Concentration (Mass, Molar, Volume Fraction) Unit Converter Calculator
Concentration Converter
Choose a basis (Mass, Mole, or Volume fraction) and convert between fraction (0–1), %, ‰, ppm, ppb, and ppt.
Mass fraction (w)
Mole fraction (x)
Volume fraction (φ)
Compressibility Unit Converter Calculator
Compressibility Unit Converter
Convert between Pa⁻¹, kPa⁻¹, MPa⁻¹, GPa⁻¹, bar⁻¹, atm⁻¹, psi⁻¹, and m²/N (≡ Pa⁻¹). Base: Pa⁻¹.
Capacitance Unit Converter Calculator
Capacitance Unit Converter
Convert between F, mF, µF, nF, pF, kF, and GF. Base: Farad (F).