  We have measured the ratio R=Gamma(Ks -> pi+pi-gamma)/Gamma(Ks -> pi0pi0)
with the KLOE detector at the DAFNE e+e- collider. This measurement is fully
inclusive with respect to the pi+pi-gamma final state. The sample of over 10^6
two-pion decays of tagged Ks mesons allows a statistical error as low as 0.1%
to be obtained. The accuracy is limited by systematic uncertainties, which are
estimated primarily from data. We find R=2.236 +/- 0.003(stat) +/- 0.015(syst).
