We present a measurement of the $W$-boson mass, $M_W$, using data
corresponding to 2.2/fb of integrated luminosity collected in ppbar collisions
at $sqrt{s}$ = 1.96 TeV with the CDF II detector at the Fermilab Tevatron. The
selected sample of 470126 $W o e
u$ candidates and 624708 $W omu
u$
candidates yields the measurement $M_W = 80387pm 12$ (stat) $pm 15$ (syst)$ =
80387 pm 19$ MeV$/c^2$ . This is the most precise single measurement of the
$W$-boson mass to date.
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