KLOE results with kaons

This report presents the recent results on K mesons from the KLOE experiment at the DAFNE e+e− collider working at the ϕ peak. They include Vus determinations, the test of the unitarity of the first row of the CKM matrix and the related experimental measurements. Tests of lepton universality from leptonic and semileptonic decays will be also discussed. Limits on new physics or tests of chiral perturbation theory are also assessed by the study of rarer kaon decays.