This paper is devoted to the measurement of the fully inclusive absolute branching ratios of the charged kaon semileptonic decays, $K^{pm}topi^0e^pm u(gamma)$ and $K^pm to pi^0mu^pm u(gamma)$. The measurements have been done using a tag technique, employing the two-body decays, $K^pm to mu^pm u$ and $K^pm to pi^pmpi^0$, and using a sample of about 410 pb$^{-1}$ collected during the 2001 and 2002 data taking of the KLOE experiment at Daphne, the Frascati $phi$-factory. The results obtained are BR(K$^pm_{e3}$) = $0.04965 (38)_{Stat} (37)_{Syst}$ and BR(K$^pm_{mu3}$) = $0.03233 (29)_{Stat} (26)_{Syst}$.
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