The quantity stays exact; the cost uses pack counts
The result card shows the calculator's fastener quantity. Its cost calculation separately rounds that quantity up to a whole number of 100-fastener packs. The value entered in the fastener price field therefore represents a pack price in this formula, not an individual-fastener price.
Let N be the displayed quantity and P the price you enter for one pack:
packs used in cost = ceil(N ÷ 100)
fastener cost term = ceil(N ÷ 100) × P
What happens near a pack boundary
| Displayed fastener count | Whole packs used | Fastener cost term |
|---|---|---|
| 96 | 1 | P |
| 100 | 1 | P |
| 102 | 2 | 2P |
| 200 | 2 | 2P |
| 202 | 3 | 3P |
P is a symbol for the price you enter; it is not a supplied market price. At a boundary, adding one fastener can increase the modeled pack count even though the displayed quantity only rises by one.
Keep pack pricing separate from item pricing
If a quote lists a price per individual fastener, that is a different unit from the pack-price input used here. Compare like units before entering a value. The calculator does not ask how many fasteners are in the package you selected; its cost expression uses 100 as the pack size.
This arithmetic is a cost-estimate rule, not a recommendation to buy a particular package. Confirm the chosen product's actual package quantity and price. The fastener count itself follows a separate fence-type formula; read how this tool calculates the fastener quantity before comparing the result with another takeoff.
Check what else is included in the total
The pack term is only one part of the entered-price total. The displayed estimate also uses the calculator's other supported quantities and price fields; it does not turn the total into a supplier quote or a complete hardware schedule.
- Record the exact fastener quantity and the pack size assumed by this calculation.
- Use the price for the same unit as the input field: one modeled pack.
- Keep other hardware or gate components outside this term unless they have their own supported input.
- After changing an input, submit the calculator again to refresh the displayed result.
See which inputs are needed before a cost total appears and which run length the cost-per-foot result uses.
Method and source
This page documents the fastener price input and the Math.ceil(fasteners / 100) × price-fasteners term in this site's calculation code. The boundary table is direct arithmetic from that expression. No fastener product, package label, supplier or market price is asserted.