Coffee, Tea, Roasting & Dry Goods Processing worked example

Roast Curve Capacity at 62% roaster uptime during profile runs: a worked example

This worked example runs the roast curve capacity numbers for a tougher week than the baseline: 62% roaster uptime during profile runs instead of the typical 86%. Estimate usable roasted output from roast batch size, batches per shift, roaster uptime, and roast-yield factor.

The inputs for this scenario

  • Roasted output per batch: 84 lb / batch (held at the documented default)
  • Planned roast batches: 22 batches (held at the documented default)
  • Roaster uptime during profile runs: 62 % (the input this scenario stresses; the baseline uses 86)
  • First-pass roasted release yield: 98 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross roast curve capacity = roasted output per batch × planned roast batches.
  • usable roast curve capacity works out to 1,123 lb at these inputs, and this is the headline figure for the scenario.
  • gross roast curve capacity works out to 1,848 lb at these inputs.
  • roast curve capacity lost to downtime works out to 702 lb at these inputs.
  • roast curve capacity lost to shrink or rejects works out to 22.92 lb at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where roaster uptime during profile runs sits at 86% and the headline result is 1,557 lb, this scenario comes in 27.91% below the baseline at 1,123 lb.
  • Use it when planning weekly production, accepting a large wholesale commitment, or evaluating whether to add a shift or a second roaster. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • usable roast curve capacity: 1,123 lb (headline result)
  • gross roast curve capacity: 1,848 lb
  • roast curve capacity lost to downtime: 702 lb
  • roast curve capacity lost to shrink or rejects: 22.92 lb

Run it with your numbers

  • To rerun this with your own numbers, open the live Roast Curve Capacity calculator, set roaster uptime during profile runs to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.