This Excel sheet is a try to calculate the required delta-v to bring a rocket into space. It is designed for the game Kerbal Space Program (KSP) but it basics are for real world rockets as well. Be advised it is not free of mathematical inconsistency, this was created just for fun and to understand a bit more what the mathematical background of creating rockets is.
More information:
KSP Wiki Orbital and physics terms
KSP Wiki Advanced Rocket Design
KSP Wiki Thrust-to-weight ratio (TWR)
Additional information (which partly influences the math in this sheet):
KSP Wiki Atmosphere (and drag)
KSP Wiki Basic Orbiting (Math)
KSP Wiki Geosynchronous Orbit (Math)