Measurement Uncertainty Calculator

Build your uncertainty budget with JCGM 100:2008 (GUM): Type A repeated readings, Type B sources, sensitivity coefficients and a coverage factor via Welch-Satterthwaite.

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Unit

Coverage factor

Measured value (optional)

Uncertainty budget

Component	Value	Distribution	Divisor	c_i	ν	u_i	\|c_i·u_i\|	Contribution

Combined standard uncertainty u_c—

Effective degrees of freedom ν_eff—

Coverage factor k—

Expanded uncertainty U—

Contribution breakdown

How is it calculated? u_i = value / divisor; the divisor is √3 for rectangular, √6 for triangular, √2 for U-shaped and the certificate k value for normal distribution. u_c = √Σ(c_i·u_i)². ν_eff = u_c⁴ / Σ((c_iu_i)⁴/ν_i) (Welch-Satterthwaite); k, %95,45 kapsam olasılığı için Student-t dağılımından alınır. U, iki anlamlı basamağa yukarı yuvarlanır.

This tool is for information only; uncertainties on accredited certificates are calculated using our laboratory's validated methods and budgets. Accreditation scope · On-site calibration appointment

Measurement Uncertainty Calculator

Uncertainty budget

Contribution breakdown

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