Coatings, Inks & Specialty Chemical Production calculator

Raw Material Expiry Exposure Calculator

Estimate how much of a raw material lot will remain at expiry. Enter current inventory, planned daily consumption, remaining calendar days and purchase cost.

What this calculator does

  • Estimate the raw material mass and purchase value left when a lot reaches its current expiry.

Formula used

  • Planned use before expiry = min(inventory, daily use × remaining days)
  • Inventory at expiry = max(inventory − daily use × remaining days, 0)
  • Purchase value exposed = inventory at expiry × cost per kilogram
  • Inventory exposed = inventory at expiry ÷ current inventory × 100

Inputs explained

  • Current Lot Inventory: Usable quantity in the lot being reviewed.
  • Planned Daily Lot Consumption: Planned calendar-day average consumption allocated to this lot.
  • Days Until Current Expiry: Calendar days remaining to the lot’s current approved expiry.
  • Material Purchase Cost: Invoice cost per kilogram for this lot.

How to use the result

  • Best suited to resin lot expiry Review, additive inventory rotation.
  • Does not predict degradation, contamination or probability of failure. An expiry extension requires separate supplier or quality authorization.

Current U.S. benchmarks

  • Industrial electricity averages 9.77 cents per kWh across the U.S. (EIA, Jul 2026), up 4.7% from a year earlier. Energy-intensive steps carry this directly into unit cost.
  • The producer price index for industrial chemicals stands at 336.006 (BLS, Aug 2026), up 13.3% from a year earlier. Quotes priced off last quarter's material cost miss this move.
  • The U.S. has 14,543 chemical manufacturing establishments employing about 911,245 workers (Census County Business Patterns, 2023).

Common questions

  • What if the material expires today? Enter zero remaining days. The model treats the current stock as exposed because no future consumption window remains.
  • Can I use working-day consumption? Convert it to a calendar-day average over the remaining window. For irregular schedules, divide planned total lot consumption by remaining calendar days.
  • Does exposure mean the material has failed? No. Exposure means inventory remains at the current expiry. Material condition and any permitted retest or extension require separate review.
  • Can I combine lots with different expiry dates? Calculate each lot separately and allocate consumption in expiry order. One average expiry can conceal an earlier lot’s exposure.

Last reviewed 2026-10-01.