Screw Quantity Calculator
Enter the run length, screw spacing, rows and waste to estimate the screws you need.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
Fastening a run of material — a deck board, a stud wall, cabinet backing, or a sheet of drywall — needs a predictable number of screws to hold securely without over-fastening or running short mid-job. The count follows straightforward run-length math: screws per row = (run length ÷ spacing) + 1, multiplied by the number of parallel rows, then increased by a waste percentage to cover stripped heads, dropped screws, and mistakes.
This calculator takes the total run length, the spacing you want between fasteners, the number of rows, and a waste allowance, and returns how many screws to buy. Carpenters, deck builders, drywall installers, and DIY renovators use it before a materials run to a hardware store, since buying the wrong quantity of screws either wastes a trip or leaves a job half-finished.
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