Screw Quantity Calculator

Calculate screws, boxes, and cost for any fastening job. Pick your application and let the estimator handle the rest.

SCREWS NEEDED
— pcs
with 10% extra

Usage Tip

Always buy 10% extra. For deck boards, drive screws at a slight angle toward center grain to prevent splitting.

THE MATH
Screws = ⌈ ⌈LinFt ÷ (Spacing÷12) × Rows⌉ × 1.10 ⌉
Where: LinFt = Area ÷ (Board Width ÷ 12)
• Includes 10% extra — screws are cheap, spares beat a second trip
• Boxes come in 100-ct and 250-ct
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.