📏 Screw Length Calculator
Calculate the correct screw length for your project
Material & Application Details
💡 General Guidelines:
• Wood: Screw should penetrate 2/3 to 3/4 of base material thickness
• Metal: Penetrate at least 2x the screw diameter
• Drywall: Penetrate at least 5/8" into stud
• Countersunk heads: Add depth for countersink (typically diameter of screw)
Recommended Screw Length
Visual Breakdown
Common Screw Length Guidelines
| Application | Material Thickness | Typical Screw Length | Notes |
|---|---|---|---|
| 3/4" Wood to Wood | 3/4" | 1-1/2" to 2" | Standard cabinet work |
| 1/2" Drywall to Stud | 1/2" | 1-1/4" | Minimum 5/8" into stud |
| 5/8" Drywall to Stud | 5/8" | 1-5/8" | For thicker drywall |
| 2x4 to 2x4 | 1-1/2" | 3" | Framing applications |
| Deck Boards | 1" to 2x6 | 2-1/2" to 3" | Outdoor deck screws |
| Plywood to Stud | 3/4" | 1-5/8" to 2" | Subfloor or sheathing |
Countersink Depth Reference
| Screw Size | Countersink Depth |
|---|---|
| #6 | 0.138" (approx. 9/64") |
| #8 | 0.164" (approx. 11/64") |
| #10 | 0.190" (approx. 3/16") |
| #12 | 0.216" (approx. 7/32") |
| 1/4" | 0.250" (1/4") |