De eksameter (symboal Em) is in lingte-ienheid, gelyk oan 1.000.000.000.000.000.000 meter. De namme is gearstald út de SI-ienheid foar langte, "meter", en it SI-foarheaksel eksa, ynternasjonaal exa. In eksameter is 1000 petameter of 0,001 settameter.
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