ERP & MRP Planning worked example

Available to Promise with available supply before new order of 4,500 units: a worked example

This scenario runs the available to promise calculation on the strong side: available supply before new order of 4,500 units, with every other input held at its documented default. a planner needs to know how many units can still be promised to new demand

The inputs for this scenario

  • Available supply before new order: 4,500 units (raised for this scenario; the documented default is 1,800)
  • Firm sales order allocations: 940 units (unchanged)
  • Protected safety stock: 250 units (unchanged)
  • Quality hold or blocked stock: 80 units (unchanged)

Working through the calculation

  • Applying the documented formula (Available to promise = available supply - firm allocations - protected safety stock - quality hold or blocked stock) to the inputs above produces each figure below.
  • At this operating point the engine returns 3,230 units for available-to-promise quantity, the number this scenario is built around.
  • At this operating point the engine returns 1,270 units for committed, protected, and blocked inventory.
  • At this operating point the engine returns 4,500 units for available supply before new order.
  • At this operating point the engine returns 71.78 % for committed/protected share of available supply.

How this compares with the baseline

  • Against the tool's baseline example, where available supply before new order sits at 1,800 units and the headline result is 530 units, this scenario comes in 509% above the baseline at 3,230 units.
  • Use it at the order-promising step, every time receipts, allocations, or quality status change, before you confirm a ship date to a customer. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Available-to-promise quantity: 3,230 units (headline result)
  • Committed, protected, and blocked inventory: 1,270 units
  • Available supply before new order: 4,500 units
  • Committed/protected share of available supply: 71.78 %

Run it with your numbers

  • Every input above is editable in the live Available to Promise calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.