How to Use the Woodworking Screw Spacing Calculator
If screw spacing is too wide, the joint weakens; if too tight, the wood can split or material gets wasted. Choose your board length and use type (structural, general woodworking, or decorative), enter your edge margin, and the calculator evenly distributes screws across the usable span and reports how many you need and the actual spacing between them.
Recommended Screw Spacing by Use Type
| Use Type | Recommended Spacing | Notes |
|---|---|---|
| Structural (load-bearing) | 150mm | Shelves, frames, load-bearing joints |
| General woodworking | 200mm | Common furniture, boxes |
| Decorative/trim | 300mm | Molding, low-load trim pieces |
Frequently Asked Questions
Why does screw spacing change by use type?
Load-bearing structural joints need tighter screw spacing to distribute weight and prevent splitting. Decorative or trim work carries little load, so wider spacing stays safe.
What happens if a screw is placed too close to the edge?
Placing a screw too close to the board edge greatly increases the risk of splitting. A margin of at least 3-5 times the board thickness is generally considered safe.