Let Constance be your constant calculation companion. It puts the most important physical constants at your fingertips. You can access the information that you need in only three touches through the thematically organized hierarchy. You don't even need to know the constant's name to find what you need.

Constance includes the SI, CGS, Geometrized, Planck and natural units for high-energy physics and both physical and astrophysical quantities.

Keywords: physical constants, astronomical constants, physics, astronomy, calculations, homework