  We employ a top-quark mass measurement technique in the dilepton channel with
{\it in situ} jet energy scale calibration. Three variables having different
jet energy scale dependences are used simultaneously to extract not only the
top-quark mass but also the energy scale of the jet from a single likelihood
fit. Monte Carlo studies with events corresponding to an integrated luminosity
of 5 fb$^{-1}$ proton-proton collisions at the Large Hadron Collider $\sqrt{s}
= 7$ TeV are performed. Our analysis suggests that the overall jet energy scale
uncertainty can be significantly reduced and the top-quark mass can be
determined with a precision of less than 1 GeV/c$^2$, including jet energy
scale uncertainty, at the Large Hadron Collider.
