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The future of high-precision electroweak physics lies in e+e- collidermeasurements of properties of the Z boson, the W boson, the Higgs boson, andthe top quark. We estimate the expected performance of three possible futurecolliders: the ILC, FCC-ee (formerly known as TLEP), and CEPC. In particular,we present the first estimates of the possible reach of CEPC, China's proposedCircular Electron-Positron Collider, for the oblique parameters S and T and forseven-parameter fits of Higgs couplings. These results allow the physicspotential for CEPC to be compared with that of the ILC and FCC-ee. We also showhow the constraints on S and T would evolve as the uncertainties on each of themost important input measurements change separately. This clarifies the basicphysics goals for future colliders. To improve on the current precision, thehighest priorities are improving the uncertainties on the W mass and effectiveweak mixing angle. At the same time, improved measurements of the top mass, theZ mass, the running of alpha, and the Z width will offer further improvementwhich will determine the ultimate reach. Each of the possible future colliderswe consider has strong prospects for probing TeV-scale electroweak physics.

Possible Futures of Electroweak Precision: ILC, FCC-ee, and CEPC