The Special Publication 250-72 presents the detailed descriptions of the Liquid Volume Calibration Services offered by NIST. Information provided in this document includes: 1) specifications for the services; 2) design philosophy and theory; 3) NIST measurement system; 4) NIST operational procedures; 5) assessment of the measurement uncertainty including random and systematic errors and an error budge; and 6) internal quality control procedures used by NIST.