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We present a measurement of the average multiplicity of phi mesons in B^0,
B^0-bar, and B^+- meson decays. Using 17.6 fb^-1 of data taken at the
Upsilon(4S) resonance by the BaBar
detector at the PEP-II e^+e^- storage ring at the Stanford
Linear Accelerator Center, we reconstruct phi mesons in the K^+K^- decay mode
and measure B(B->phi X) = (3.41+-0.06+-0.12)%.
This is significantly more precise than any previous measurement.
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