Information at the foundation of modern science and technology from the Physical Measurement Laboratory of NIST

Constants, Units & Uncertainty home page

Essentials of expressing measurement uncertainty     Basic definitions     Evaluating uncertainty components     Combining uncertainty components     Expanded uncertainty and coverage factor     Examples of uncertainty statements Evaluation of measurement uncertainty     NIST Uncertainty Machine - An online calculator to perform uncertainty evaluations according to the Guide to the Expression of Uncertainty Measurement (GUM), the GUM Supplement 1, and the NIST Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results. Background     International and U.S. perspectives on measurement uncertainty Bibliography     Online publications and purchasing information

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