"units" [ http://en.wikipedia.org/wiki/Units_(Unix) ] is your friend
$ units 2445 units, 71 prefixes, 33 nonlinear units You have: 1 rydberg/bohrradius^3 You want: gigapascal * 14710.505 / 6.7978632e-05 With the Ubuntu version, at least, using "au" instead of "bohrradius" produces interesting results. It helps to read the documentation. Mansoureh Pashangpour wrote: > Dear all > I"m calculating bulk modulus for a system with PWscf. As you know Etot > unit is Ry and V unit is a,u.^3. > how can I find (K0 and K'0) bulk modulus in Gpa unit. > Thanks > > > ------------------------------------------------------------------------ > > _______________________________________________ > Pw_forum mailing list > Pw_forum at pwscf.org > http://www.democritos.it/mailman/listinfo/pw_forum -- Michael J. Mehl Naval Research Laboratory Washington DC Currently at Duke University (This is not my work email)