Calculate photon energy (E = hf = hc/λ) online. Convert between wavelength (nm), frequency (THz), Joules, and electron-volts (eV) with quantum physics presets.

Calculate maximum photoelectron kinetic energy, stopping potential V0, cutoff threshold frequency, and work functions using Einstein

Calculate orbital speed, Keplerian period, escape velocity, Vis-Viva equation, and Hohmann transfer orbit delta-v across LEO, GEO, Moon, Mars, and custom celestial bodies.

Calculate orbital Hohmann transfer delta-v requirements, transfer orbit semi-major axis, time of flight, propellant mass consumption, and bi-elliptic transfer comparisons.

Calculate satellite orbital decay rate, atmospheric thermospheric drag, ballistic coefficient, and remaining on-orbit lifetime across solar cycle activity levels.

Calculate optical fiber numerical aperture (NA), acceptance cone angle, normalized frequency (V-number), single-mode cutoff wavelength, and guided mode count.

Calculate supersonic oblique shock wave angles, downstream Mach number, pressure ratio, temperature jump, stagnation pressure loss, and detachment limits via the theta-beta-Mach equation.

Calculate normal shock downstream Mach number M2, pressure ratio p2/p1, temperature ratio T2/T1, stagnation pressure loss p02/p01, and entropy jump using Rankine-Hugoniot relations.

Calculate spectral line Zeeman splitting, Landé g-factors, sublevel energy shifts, and polarization transition wavelengths in magnetic fields for atomic physics.

Calculate force, mass, or acceleration using Newton