Gypsum, Drywall & Interior Panel Manufacturing calculator

Starch/Additive Usage Calculator

Estimate starch or additive consumption by entering boards to produce, additive dosage per board from the current formulation, and metering system efficiency. The result sizes the batch and accounts for metering losses before the run starts.

What this calculator does

  • Estimate starch or additive required for a board production run based on boards to produce, additive dosage per board, and metering efficiency.
  • Use it before a production run to set the additive batch size and avoid a process upset caused by the metering system running dry mid-run.
  • The result estimates the starch or additive quantity in lb needed to complete a board production run at the entered dosage and metering efficiency.

Formula used

  • Theoretical additive = boards to produce x additive dosage per board
  • Required additive = theoretical additive / metering efficiency

Inputs explained

  • Boards to produce: undefined
  • Additive dosage per board: undefined
  • Metering efficiency: undefined

How to use the result

  • Use it when sizing an additive batch, reviewing additive loss against a formulation target, or planning an additive order before a long run.
  • It remains an estimate when additive concentration, slurry temperature, metering pump calibration, or board thickness differs from the values entered.

Common questions

  • What additives are used in gypsum board production? Common additives include starch (for paper bond and sag resistance), retarders (to control set time), accelerators (to speed setting), foaming agents (to reduce core density), and water-resistance additives. Each is metered separately into the slurry.
  • What data should I enter? Use boards to produce from the production schedule, additive dosage per board from the current approved formulation, and metering efficiency from recent pump calibration or dosing records.
  • When is the result only an estimate? It remains an estimate when additive concentration, slurry temperature, metering pump calibration, or board thickness differs from the values used in the formulation.
  • What decision can this support? Use the result to set the batch size or order quantity before a run, then confirm with the formulation engineer that the dosage is current for the board grade being produced.

Last reviewed 2026-05-12.