Calculate free space path loss (FSPL), Friis transmission received power, EIRP, link margin, Fresnel zone clearance, and link budget across RF frequencies.

Calculate static friction Fs, sliding kinetic friction Fk, normal contact force, and angle of repose.

Free free fall calculator. Calculate fall time, impact speed (m/s, mph), drop distance, and acceleration across Earth, Moon, Mars, and Jupiter.

Calculate compressible Fanno flow in constant-area adiabatic ducts with wall friction. Determine choking length L*, downstream Mach number, pressure drops, and T-s Fanno lines.

Calculate observed frequency and wavelength shifts for moving sound sources and relativistic light redshift.

Calculate density (ρ = m/V), mass, and volume online. Free physics calculator with 30+ material presets (gold, water, steel, air) and unit conversions.

Calculate sound pressure level (dB SPL), inverse square distance falloff, power gain, and source sums.

Calculate de Broglie matter wavelength for electrons, protons, and particles. Compare non-relativistic vs. relativistic wavelengths, TEM resolution, and thermal de Broglie wavelength.

Calculate Compton scattering wavelength shift, scattered photon energy, recoil electron kinetic energy, Compton edge, and Klein-Nishina differential cross-section.

Calculate centripetal force Fc, centripetal acceleration ac, angular velocity, period, and RPM.