Uncertainty Calculator

GUM-based Type A and Type B uncertainty evaluation

Type A — Statistical Analysis

Type B — Other Sources

k=2 ≈ 95%, k=3 ≈ 99%

Enter readings and uncertainty sources, then click Calculate.

Based on GUM (Guide to the Expression of Uncertainty in Measurement)

About this calculator

  • Type A: Statistical analysis of repeated observations (s/√n)
  • Type B: Evaluation from specifications, certificates, or other information
  • Combined uncertainty: Root sum of squares (RSS)
  • Expanded uncertainty: U = k × uc