Free Interplanetary Space Travel Calculator for planet transfer time, Hohmann transfer, launch windows, light delay, cruise speed, constant acceleration, delta-v, and propellant estimates.
Free Two-Body Orbit Parameter Calculator for semi-major axis, eccentricity, periapsis, apoapsis, energy, angular momentum, period, anomalies, and orbit classification.
Free Hohmann Transfer Calculator for two-burn orbital transfer delta-v, transfer time, phase angle, bi-elliptic comparison, propellant estimate, and orbit speeds.
Free Specific Orbital Energy Calculator for orbital energy, kinetic and potential energy, semi-major axis, C3, hyperbolic excess speed, total energy, and orbit classification.
Free Orbital Period Calculator for circular and elliptical orbits, Kepler’s third law, radius from period, synchronous orbit altitude, mean motion, and orbital velocity.
Free Orbital Velocity Calculator for circular orbit speed, elliptical orbit speed, orbital period, radius, altitude, escape velocity, synchronous orbit, Hohmann transfer, and body comparison.
Free Delta-V Calculator for rocket equation, mass ratio, propellant fraction, multi-stage rockets, Hohmann transfer, plane change, escape injection, and mission delta-v budgets.
Free Escape Velocity Calculator for escape speed, orbital velocity, surface gravity, planet presets, altitude correction, energy required, reverse solver, and Schwarzschild radius.
Free digital E6B flight computer for wind correction, ground speed, fuel, density altitude, TAS, crosswind, climb, time, distance and conversions.
Free Flight Endurance & Fuel Planner for aircraft fuel required, endurance, reserve fuel, alternate fuel, holding time, fuel unit conversion, fuel cost, and wind-corrected range.