AHP Calculator (Analytic Hierarchy Process)
Free AHP calculator (Analytic Hierarchy Process). Define criteria and alternatives, perform pairwise comparisons using Saaty scale, get weights, consistency ratio (CR), and global priorities. Browser-based, no upload.
Full original guide (expanded)
AHP Calculator (Analytic Hierarchy Process)
Define criteria and alternatives, fill in pairwise comparison matrices using the 1–9 Saaty scale, and the tool will compute: criteria weights, alternative weights per criterion, overall priority of alternatives, and the consistency ratio.
Criteria matrix CR
—
Best alternative
—
Total alternatives
3
How this AHP calculator works
This tool implements the classic Saaty method:
- Create the criteria pairwise comparison matrix \(A\).
- Normalize columns and average rows to get the criteria weight vector.
- Compute \(\lambda_{max}\), Consistency Index \(CI = (\lambda_{max} - n)/(n-1)\) and Consistency Ratio \(CR = CI / RI\).
- For each criterion, build an alternatives matrix and repeat.
- Multiply criteria weights by local alternative weights to get the global priorities.
Saaty scale (1–9)
- 1 = equal importance
- 3 = moderate importance
- 5 = strong importance
- 7 = very strong importance
- 9 = extreme importance
- 2,4,6,8 = intermediate values
- Reciprocals (1/3, 1/5, …) for the opposite judgement
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\\]
','\
Variables and units
- No variables provided in audit spec.
Sources (authoritative):
- NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures - FTC — Consumer advice — consumer.ftc.gov · Accessed 2026-01-19
https://consumer.ftc.gov/
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
- Initial audit spec draft generated from HTML extraction (review required).
- Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
- Confirm sources are authoritative and relevant to the calculator methodology.