Two-Input Measurement Uncertainty

Enter standard uncertainties, not tolerance limits or percentages. Use consistent units. The coverage factor scales uncertainty; it does not establish a confidence level by itself.

Worked guide: standard uncertainty, correlation and measured power

Inputs

Measurement equation

Estimate A (A unit)

Estimate B (B unit)

Standard uncertainty of A (A unit)

Standard uncertainty of B (B unit)

Correlation coefficient (−1 to 1)

Coverage factor k

Results

Enter inputs and click calculate to see the result.

References

NIST TN 1297 Appendix A: Law of Propagation of UncertaintySource accessed 2026-09-08
NIST TN 1297 Section 6: Expanded UncertaintySource accessed 2026-09-08

Two-Input Measurement Uncertainty

Calculation Steps

References