Plus-Minus - the uncertainty budget behind the number you are about to report

Paste the measured inputs with their uncertainties and units, and the formula for the result. The browser checks the dimensions, propagates the uncertainty per the GUM (JCGM 100) with exact sensitivity coefficients, computes Welch-Satterthwaite effective degrees of freedom and the coverage factor, cross-checks by Monte Carlo (JCGM 101) and rounds the result properly - free, before you sign in. Then a metrologist reviews the budget: every stated uncertainty judged, the contributions a competent evaluation would also carry as ready-to-paste sheet lines, the improvements ranked by share of variance, the correct statement and a verdict. Then the uncertainty section for a lab report, paper, calibration certificate or internal record, with the budget table and a thirteen-point reporting checklist. Derived from the agent skill @k-dense-ai/uncertainty-and-units (k-dense-ai/scientific-agent-skills, MIT); not affiliated with the authors, the BIPM or the JCGM.

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