This video provides an introduction to the "Rocket Equations" which are used to estimate the size of an orbital rocket. Concepts such as launch velocity, Delta-V losses, mass fraction, and structural ratio are discussed. An example problem is worked to show how the equations are used and the results are compared to an actual rocket. This video is intended for high school teachers and students and early engineering students. More information on this topic can be found at www.labratscientific.com.