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sci.measurement-uncertainty-GUM Calculator
Calculates combined measurement uncertainty using the GUM (Guide to the Expression of Uncertainty in Measurement) propagation formula: u_c² = Σ(∂f/∂xᵢ × uᵢ)². Expanded uncertainty U = k×u_c with k=2 gives 95% confidence interval — all published scientific measurements should report uncertainty to GUM standard.
Inputs
U1
Reference formula or conversion factor shown for context.
U2
Reference formula or conversion factor shown for context.
U3
Reference formula or conversion factor shown for context.
K Coverage
A multiplier applied in the calculation.
Results
combined standard uncertainty uc
Sample size or count used in the calculation.
expanded uncertainty U = k·uc
Sample size or count used in the calculation.
coverage factor k
The fraction of the total that is protected, tested, or accounted for. Higher coverage reduces risk of gaps.
uc = √(u₁²+u₂²+u₃²)
Reference formula or conversion factor shown for context.
type A (statistical)
The classification or type assigned based on the inputs.