Volume 102, Number 6, November–December 1997 Journal of Research of the National Institute of Standards and Technology [J. Res. Natl. Inst. Stand. Technol. 102, 647 (1997)] Uncertainty and Dimensional Calibrations Volume 102 Ted Doiron and John Stoup National Institute of Standards and Technology, Gaithersburg, MD 20899-0001 Number 6 The calculation of uncertainty for a measurement is an effort to set reasonable bounds for the measurement result according to standardized rules. Since every measurement produces only an estimate of the answer, the primary requisite of an uncertainty statement is to inform the reader of how sure the writer is that the answer is in a certain range