Make supplier decisions with visible assumptions instead of gut feel.
Calculate on-time delivery, lead-time averages and variation, supplier concentration, weighted scorecards, alternative-source coverage, order buffers and incoming defect rates.
Useful numbers, visible assumptions
These tools are built for early-stage planning and operational review. You supply the rates, quantities, periods and performance assumptions that belong to your situation; the site shows the arithmetic and explains what can change the result.
Popular calculators
On-Time Delivery Calculator
Calculate the percentage of supplier deliveries that arrived on or before the agreed date.
Open →Average Lead Time Calculator
Calculate average supplier lead time from a comma-separated series of observations.
Open →Lead-Time Variability Calculator
Estimate standard deviation from a comma-separated set of supplier lead-time observations.
Open →Supplier Concentration Calculator
Calculate a simple HHI-style concentration indicator from supplier share percentages.
Open →Weighted Supplier Scorecard
Combine quality, delivery, cost and service ratings into a simple weighted planning score.
Open →Alternative Source Coverage
Calculate the share of critical supplied items that have a viable alternative source.
Open →Practical guides
Supplier Segmentation for Practical Management
A practical framework for supplier segmentation for practical management, including the data to collect, assumptions to document, comparisons to make and limits to recognize.
Open →Understand Supplier Lead Time
A practical framework for understand supplier lead time, including the data to collect, assumptions to document, comparisons to make and limits to recognize.
Open →Why Lead-Time Variability Matters
A practical framework for why lead-time variability matters, including the data to collect, assumptions to document, comparisons to make and limits to recognize.
Open →Dual and Alternative Sourcing
A practical framework for dual and alternative sourcing, including the data to collect, assumptions to document, comparisons to make and limits to recognize.
Open →Supplier Concentration and Dependency
A practical framework for supplier concentration and dependency, including the data to collect, assumptions to document, comparisons to make and limits to recognize.
Open →Building a Useful Supplier Scorecard
A practical framework for building a useful supplier scorecard, including the data to collect, assumptions to document, comparisons to make and limits to recognize.
Open →Built for international use
Most tools avoid hard-coding currency, utility rates, labour rates, legal thresholds or regional benchmarks. Use consistent units and the rates that apply where you operate.
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