Weighted Decision Matrix Calculator
Convert three scored criteria and their relative weights into one transparent score. Repeat the calculation for each option using the same criteria and weights; do not change weights just to favour an option.
How to use this calculator
- Enter criterion a score (0–10), criterion a weight (%), criterion b score (0–10) and the remaining stated inputs; keep their units consistent.
- Review the result and intermediate values; change one input at a time when comparing scenarios.
- Keep the stated formula and assumptions with any result you share.
Formula and method
Weighted score = Σ(score × weight) ÷ Σ(weight). Scores are on a 0–10 scale; weights are relative and need not sum to exactly 100.
- Weighted score is 7.85 out of 10 (78.5 out of 100).
- This model does not prove an option is best. Scores are subjective, criteria may be correlated, and missing criteria can change the conclusion.
Worked examples
Worked example
An option scores 8, 7 and 9 with weights 40%, 35% and 25%.
Weighted score is 7.85 out of 10 (78.5 out of 100).
Weighted score is 7.85 out of 10 (78.5 out of 100).
Understanding the result
Weighted score is 7.85 out of 10 (78.5 out of 100).
This model does not prove an option is best. Scores are subjective, criteria may be correlated, and missing criteria can change the conclusion.
Important notes
This model does not prove an option is best. Scores are subjective, criteria may be correlated, and missing criteria can change the conclusion.
Use measured inputs and verify that the model matches the situation before making an operational, financial or technical decision.
Frequently asked questions
Why do the weights not have to total 100%?
The calculator normalizes by the entered weight sum, so any positive relative weights work.
Should I use it to make high-stakes decisions alone?
No. Include relevant criteria, uncertainty, evidence and stakeholder review.
What should I check before relying on this result?
Verify units, input definitions and assumptions against your real data or the relevant product, service or professional guidance.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
- How to Calculate a Z-Score — Learn how a z-score shows how far a value is from the mean in standard-deviation units.
- Percentage Change vs Percentage Difference — Understand the difference between percentage change and percentage difference, including when each formula is appropriate.
- Z-Score — Learn what a z-score measures and how it describes a value relative to a mean and standard deviation.
This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.