# Calculate Delta-V for a Hohmann transfer to a higher orbit

I am wondering if anybody can help me with calculating Delta-V in Kerbal Space program?

I have a ship in circularized 100 km orbit around planet Kerbin. Planet's radius is 600 km (standard gravitational parameter μ = 3.5316000×1012 m3s-2). I want to perform a Hohmann transfer to a target orbit of 400 km above surface, i.e. 1000 km radius to planet's center of gravity (orbit's focus).

Can anybody please explain how can I calculate Delta-V cost of a Hohmann transfer orbit raising maneuver?

• Is the fact that you need this for a game relevant at all to your question? KSP uses instantaneous impulse, right? So $\Delta v = \sqrt{\frac{\mu}{r_1}} \left( \sqrt{\frac{2 r_2}{r_1+r_2}} - 1 \right) + \sqrt{\frac{\mu}{r_2}} \left( 1 - \sqrt{\frac{2 r_1}{r_1+r_2}}\,\,\right)$ as explained in Hohmann transfer Wiki. – TildalWave Jun 2 '14 at 19:38