Formulas: NPL - Upper Normal Prediction limit

MIL-STD-810H, Environmental Engineering Considerations and Laboratory Tests

Last Updated 29 Oct 2026

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Formula 1

\mathrm{NPL}(\mathrm{N}, \gamma)=10

Formula 2

where $\alpha=1-\gamma$ .

\alpha=1-\gamma

Formula 3

$t_{\mathrm{N}-1 ; \alpha}$ is the student $t$ distribution variable with N-1 degrees of freedom at the $100 \alpha=100(1-\gamma)$ percentage point of the distribution.

100 \alpha=100(1-\gamma)