S&OP, Demand Planning & Forecasting calculator

Supply Demand Gap Calculator

Estimate supply demand gap for sandop, demand planning and forecasting using production-ready inputs so teams can plan replenishment and safety stock using actual usage and lead time. On-hand divided by daily usage, then divided by safety multiplier, gives a protected days of supply.

What this calculator does

  • Estimate supply demand gap for sandop, demand planning and forecasting using production-ready inputs so teams can plan replenishment and safety stock using actual usage and lead time.
  • Use it when supply demand gap in s and op, demand planning and forecasting is being sized for a buffer or safety stock review.
  • Turns supply demand gap daily usage, supply demand gap lead time, supply demand gap safety stock into a protected days of supply for supply demand gap in s and op, demand planning and forecasting.

Formula used

  • Supply demand gap cycle stock = supply demand gap daily usage × supply demand gap lead time
  • Required supply demand gap inventory = cycle stock + supply demand gap safety stock

Inputs explained

  • Supply demand gap daily usage: Use recent consumption, demand history, service usage, production schedule, or MRP issue rate.
  • Supply demand gap lead time: Enter supplier, internal replenishment, repair, transit, or planning lead time.
  • Supply demand gap safety stock: Add buffer for demand variation, supplier risk, quality holds, downtime, or service-level requirements.

How to use the result

  • Use it when supply demand gap in s and op, demand planning and forecasting is being reviewed for stockout risk.
  • Lead time variability and supplier reliability are not in the formula. Adjust safety multiplier to compensate.

Common questions

  • Why use this supply demand gap tool for s and op, demand planning and forecasting? Estimate supply demand gap for sandop, demand planning and forecasting using production-ready inputs so teams can plan replenishment and safety stock using actual usage and lead time. You get a protected days of supply you can defend before quoting, scheduling, or sign-off.
  • What numbers should I focus on first? supply demand gap daily usage, supply demand gap lead time, supply demand gap safety stock usually move the protected days of supply most. Pull from measured s and op, demand planning and forecasting runs, supplier data, and recent quotes rather than memory.
  • How should I act on the output? Use protected days to set the next reorder point or buffer level for s and op, demand planning and forecasting.
  • What can throw the result off? Confirm daily usage is a real recent average, not a quarterly mean that hides a spike.

Last reviewed 2026-05-12.