How do you calculate days of powder supply?

Stock over burn rate: 1,200 lb at 85 lb a day is 14.1 days. Dividing by a 1.1 safety factor gives 12.8 protected days, the figure to compare against lead time.

What does the safety factor do?

It divides coverage down to a conservative figure: 14.1 days over 1.1 is 12.8. Factors below one inflate coverage instead, and the page warns on them. Volatile demand earns 1.2 to 1.3.

When should I reorder powder?

When protected days approach the lead time, or when stock hits the reorder point of usage × factor × lead, 935 lb at the defaults. A 2.8-day margin means order this week.

How much powder inventory is too much?

Past the shelf-life window, any of it. Powder absorbs moisture and can sinter in storage, so months of coverage is degradation risk. Keep protected days above lead time and below shelf life.

Finishing calculator

Powder Inventory Days Calculator: Coverage Against Lead Time

Convert powder on hand into protected days of supply and compare it with the supplier's lead time. The page ends at the reorder point in pounds.

What this calculator does

Protected powder coverage against supplier lead time, ending at the reorder point in pounds.

Formula used

Unprotected days = powder on hand ÷ average daily usage
Protected days = unprotected days ÷ safety factor
Margin over lead time = protected days − supplier lead time
Reorder point = daily usage × safety factor × lead time

Inputs explained

Powder on Hand: Usable stock of this color from a physical count.
Average Powder Usage: Consumption per production day, net of reclaim returns.
Safety Factor: Divisor discounting coverage for spikes and count error.
Supplier Lead Time: Order-to-dock days for this product and color.

How to use the result

Best suited to setting per-color reorder points, checking whether a big order outruns the bin, managing long-lead custom colors.
A known spike inside the window breaks the average; subtract it from coverage directly. Shelf life caps useful coverage; months of protected days signal over-stocking. Reclaim outages raise the burn rate mid-window; the usage entry must reflect net draw.

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

How do you calculate days of powder supply? Stock over burn rate: 1,200 lb at 85 lb a day is 14.1 days. Dividing by a 1.1 safety factor gives 12.8 protected days, the figure to compare against lead time.
What does the safety factor do? It divides coverage down to a conservative figure: 14.1 days over 1.1 is 12.8. Factors below one inflate coverage instead, and the page warns on them. Volatile demand earns 1.2 to 1.3.
When should I reorder powder? When protected days approach the lead time, or when stock hits the reorder point of usage × factor × lead, 935 lb at the defaults. A 2.8-day margin means order this week.
How much powder inventory is too much? Past the shelf-life window, any of it. Powder absorbs moisture and can sinter in storage, so months of coverage is degradation risk. Keep protected days above lead time and below shelf life.

Last reviewed 2026-10-01.