Supplier Performance Calculator
Score your suppliers on quality, delivery, cost, and service using weighted metrics. Use it during vendor reviews or sourcing decisions to compare suppliers objectively.
About this calculator
A supplier performance score aggregates four key metrics — Quality Score, On-Time Delivery Rate, Cost Competitiveness, and Service Level Rating — into a single composite index. The weight applied to each metric depends on the chosen weighting scheme. Under equal weighting: Score = (Q + D + C + S) / 4. Under quality-focused weighting: Score = Q×0.4 + D×0.2 + C×0.2 + S×0.2. Under delivery-focused weighting: Score = Q×0.25 + D×0.4 + C×0.2 + S×0.15. Under cost-focused weighting: Score = Q×0.2 + D×0.25 + C×0.4 + S×0.15. All inputs are expressed as percentages (0–100). The resulting score gives procurement teams a reproducible, auditable way to rank and compare vendors.
How to use
A supplier has: Quality = 92%, Delivery = 85%, Cost Competitiveness = 78%, Service Level = 88%. Using quality-focused weighting: Score = 92×0.4 + 85×0.2 + 78×0.2 + 88×0.2 = 36.8 + 17.0 + 15.6 + 17.6 = 87.0%. This score of 87% indicates a strong overall performer with particular strength in quality. Compare this against a second supplier to decide which to preferred-vendor status.
Frequently asked questions
What weighting scheme should I use for supplier performance scoring?
Choose the weighting scheme that reflects your business priorities. If product defects are costly or carry safety risks, select quality-focused weights (40% quality). If stockouts are your biggest pain point, use delivery-focused weights (40% delivery). If margin pressure is the primary concern, cost-focused weights (40% cost competitiveness) are appropriate. Many companies start with equal weights during initial vendor evaluation and then shift to a priority-based scheme once their supply chain risks are better understood.
How often should supplier performance scores be calculated?
Most organizations calculate supplier performance scores monthly or quarterly, aligning reviews with procurement cycles or contract renewal windows. High-volume or critical suppliers may warrant monthly scorecards, while lower-tier suppliers can be assessed quarterly or annually. Regular scoring creates a performance trend history, making it easier to spot deteriorating suppliers early and initiate corrective action before service failures occur.
What is a good supplier performance score and what should I do if a supplier scores low?
A score above 85% generally indicates a reliable, high-performing supplier. Scores between 70–85% suggest acceptable performance with room for improvement. Scores below 70% are a warning sign and typically trigger a formal corrective action plan or sourcing review. When a supplier scores low, share the detailed breakdown with them — identifying whether the weakness is in quality, delivery, cost, or service helps focus improvement efforts and opens a productive dialogue rather than simply penalizing the vendor.