Enter altitude for initial orbit in LEO kilometers.
Enter altitude for final orbit above GEO: kilometers.
Based on Bryan Weber's Hohmann transfer script
This calculator doesn't take account of any requirements to change inclination. It also doesn't take account of any use of the gravity of the Moon (or the sun) to assist in the transfer, which may be especially useful for high orbits (as for the lunar gravity assist used to rescue Asia-Sat-3 / HGS‐1 )