Screw Count Calculator (Kg to Pieces)
Calculate the number of screws in a box by weight. Specialized for Drywall, Wood, and Self-tapping screws with box estimation.
Drywall
Wood
Self-Tap
Estimated Total
0
screws
□ Can fill 0 full boxes of 0
About
In construction and woodworking, screws are purchased by the box or by weight (kg/lbs), but usage is calculated by count (e.g., 40 screws per drywall sheet). This calculator bridges the gap, allowing contractors to estimate the total piece count from a bulk weight.
The tool includes specific data for Drywall screws (Phosphated steel, Bugle head), Wood screws (Yellow zinc, Countersunk), and Self-tapping screws. It also calculates how many standard boxes you can fill from a bulk shipment, aiding in repackaging or distribution logistics.
construction calculator
screw counter
drywall screws
woodworking tools
fastener estimation
Formulas
Piece Count N:
N = Mbulkmscrew
Box Estimation:
Boxes = floorNBoxSize
Reference Data
| Screw Type | Size | Avg Weight (g) | Count per kg |
|---|---|---|---|
| Drywall (Fine) | 3.5 x 25mm | 1.40 | 714 |
| Drywall (Fine) | 3.5 x 35mm | 1.85 | 540 |
| Drywall (Coarse) | 3.9 x 55mm | 3.10 | 322 |
| Wood (Zinc) | 4.0 x 40mm | 2.60 | 384 |
| Wood (Zinc) | 5.0 x 80mm | 7.20 | 138 |
| Self-Tapping | 4.2 x 19mm | 1.60 | 625 |
Frequently Asked Questions
Yes. Drywall screws typically have a thinner shank and a bugle head designed to sit flush in gypsum, making them lighter than standard wood screws of the same length.
Zinc plating or phosphate coatings add negligible weight. However, ceramic coatings (for decking screws) can add measurable thickness and weight, potentially reducing the count per kg by 1-2%.
We calculate a ±2% margin. A "1000 count" box from a factory often contains between 990 and 1010 screws because they are also packaged by weight, not counted individually.
No. Nails have a different head-to-shank mass ratio and density profile. Please use a specific nail counter.