Mass/Weights Uncertainty Budget — ISO 17025 Excel Template — CPGL-CAL-007

ISO 17025 Uncertainty Budget Excel Template for Mass/Weights Calibration

Professional Excel spreadsheet for calculating measurement uncertainty in mass and weight calibration, fully compliant with ISO/IEC 17025:2017 and ISO GUM (JCGM 100:2008).

Key features:

• Multi-point calibration worksheet with formula-driven calculations
• 10 expanded uncertainty sources per calibration point with sensitivity coefficients (ci)
• YES/NO applicability toggles — activate only the sources relevant to your lab
• Built-in quality checks (combined uncertainty validation, k-factor bounds)
• Student-t VLOOKUP table (1-30 degrees of freedom) — proper k determination, not assumed k=2
• Welch-Satterthwaite formula for effective degrees of freedom
• Assumptions and Guidelines reference tab
• Print-ready A4 layout

Uncertainty sources covered:

• Repeatability, resolution, reference standard, drift, buoyancy correction, eccentricity, magnetism, convection effects, contamination, and rounding

Who is this for?

• Calibration laboratories preparing for or maintaining ISO 17025 accreditation
• Labs upgrading uncertainty budgets to full GUM compliance
• Calibration managers and technical signatories

Developed by an ISO 17025 approved signatory. Saves 20-40 hours vs building from scratch. Instant download.