// multi-utility computation suite · offline · instant · precise
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eng.lean-value-stream-map Calculator
Calculates value stream map metrics including takt time, process cycle efficiency, and total lead time from production data. Process cycle efficiency (value-added time / total lead time) is typically 1–5% in batch manufacturing — lean systems target 25–80%.
Inputs
Value Added Time Min
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Total Lead Time Days
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Inventory Days
Reference formula or conversion factor shown for context.
Defect Rate Pct
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Results
process efficiency
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
value-added ratio
The computed numeric or monetary value.
total lead time
Lead time for changes -- time from code commit to production. A key DORA metric. Elite teams achieve under one hour.
first-pass yield
Reference formula or conversion factor shown for context.