Drill Bit Size Converter (mm ↔ inch)
Instantly convert between metric (mm) and imperial (inch) drill bit sizes. This drill bit conversion tool also shows you the closest standard fractional bits from a complete drill bit size chart, making it easy to find the right bit for the job.
Closest Standard Bit Sizes
Your value is shown in bold. The table shows the nearest smaller, closest overall, and nearest larger standard drill bits.
Fractional (inch) |
Decimal (inch) |
Metric (mm) |
Type |
Find the Right Drill Bit Set
A complete set ensures you always have the exact size you need. Check out these top-rated sets. (As an Amazon Associate, we earn from qualifying purchases.)