Engineering Calculators

Engineering calculators are only as trustworthy as their formulas are visible, so every tool here shows its equation and cites its source: Hammerstad's microstrip equations as printed in Pozar, the Colebrook-White friction factor behind the Moody chart, coax attenuation constants from manufacturer datasheets, unit conversion factors cross-checked against NIST SP 811. You can trace any number back to its source and rerun the worked example by hand.

The RF set covers the everyday feedline questions: converting dBm to watts, translating a VSWR reading into return loss and real delivered power, and finding how many of your watts survive a coax run. The board-level and fluids tools handle microstrip trace impedance, pipe pressure drop from flow rate with fitting losses, and the Reynolds number check that tells you which friction model is even valid. The unit converter ties the whole category together: 24 quantities from torque to kinematic viscosity, every factor exact and derived from defining constants. Each tool also states the range its equations are valid for.

• dBm to Watts Calculator

  Convert between dBm and watts or milliwatts in either direction, with a common-values table.

• VSWR Calculator

  Enter any one of VSWR, return loss, reflection coefficient, or mismatch loss to get the rest.

• Coax Cable Loss Calculator

  Cable type, length, and frequency to dB loss and power delivered, RG and LMR presets included.

• Microstrip Impedance Calculator

  Trace width, substrate height, and εr to Z₀, or solve for the width that hits a target impedance.

• Pipe Pressure Drop Calculator

  Pressure drop from flow rate and pipe size: Darcy-Weisbach with fitting losses, elevation, and temperature-dependent liquid and gas properties.

• Heat Transfer Calculator

  Conduction, convection and radiation for HVAC: wall and roof U-values with air films and framing, pipe insulation, and surface heat flow.

• Heat Sink Calculator

  Size a heat sink from the junction-to-ambient thermal resistance network, or find the junction temperature a sink you already have will allow.

• Sensible & Latent Heat Calculator

  Split an HVAC load into sensible and latent parts: airflow, temperature rise and humidity change to Btu/h, with the 1.08 and 0.68 constants derived from air properties.

• Reynolds Number Calculator

  Velocity, pipe diameter, and fluid viscosity to Reynolds number with a laminar/turbulent verdict.

• Engineering Unit Converter

  Convert across 24 quantities: every factor exact, derived from defining constants, and sourced.

• Multiphase Flow Analyzer

  Gas–liquid pressure drop, void fraction, flow regime, and boiling or condensing heat transfer along the pipe.