S&OP, Demand Planning & Forecasting worked example

Demand Variability at 99% plannable demand availability: a worked example in s&op, demand planning & forecasting

What does the result look like when plannable demand availability reaches 99%? The full calculation is worked below with real intermediate numbers. Use it when demand variability in s and op, demand planning and forecasting is being asked to take on more work and you need to know if there is room.

The inputs for this scenario

  • Demand units per planning period: 4 units / cycle (unchanged)
  • Planning periods in the horizon: 480 cycles (unchanged)
  • Plannable demand availability: 99 % (raised for this scenario; the documented default is 90)
  • Clean-signal demand yield: 97 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross demand variability capacity = demand variability output per cycle × available demand variability cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 1,844 units for good demand variability capacity, the number this scenario is built around.
  • At this operating point the engine returns 1,920 units for gross demand variability capacity.
  • At this operating point the engine returns 19.2 units for demand variability downtime loss.
  • At this operating point the engine returns 57.02 units for demand variability yield loss.

How this compares with the baseline

  • Against the tool's baseline example, where plannable demand availability sits at 90% and the headline result is 1,676 units, this scenario comes in 10% above the baseline at 1,844 units.
  • A figure at this level is achievable when plannable demand availability is genuinely sustained, not just peaked for a shift. It scales volume with flat factors and does not compute a true statistical variance, so pair it with a coefficient-of-variation measure for buffer sizing.

Results at a glance

  • Good demand variability capacity: 1,844 units (headline result)
  • Gross demand variability capacity: 1,920 units
  • Demand variability downtime loss: 19.2 units
  • Demand variability yield loss: 57.02 units

Run it with your numbers

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

Last reviewed 2026-05-12.