Hardware stores use a mix of gauge numbers, fractions, and metric millimeters that can be confusing for DIYers and pros alike. Our Screw Size Converter translates standard wood and machine screw gauges into their physical decimal and fractional equivalents. Match your screws to the correct drill bit size and ensure a secure fit for your next woodworking or mechanical assembly project.
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International Screw Size Converter
Convert between screw gauges, fractional inches, and metric (mm) dimensions for wood and machine screws. Fast, free, and 100% private browser tool.
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1
Enter Gauge
Select a standard screw gauge number.
2
See Metric
Check the equivalent decimal inches and millimeter diameter.
3
Review Results
Verify the output looks correct before using or downloading it.
4
Save Your Output
Click the download or copy button to export your results to your device or clipboard.
Key Features
Gauge to Diameter
Translates #2 through #24 screw gauges into their precise fractional inch measurements.
Metric Mapping
Instantly see the equivalent diameter in millimeters for use with international hardware.
Drill Bit Guide
Provides recommendations for pilot hole sizes to prevent wood splitting.
Frequently Asked Questions
The diameter in inches is roughly (Gauge x 0.013) + 0.060.
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