Use our free drill bit size converter to instantly convert any bit size between millimetres, decimal inches and fractions — and find the nearest standard drill size.
Drill Bit Size Converter
Convert any drill bit size between millimetres, decimal inches and fractions — and find the nearest standard drill.
Tip: type a fraction like 5/16, a metric size like 8 mm, or a decimal like 0.201.
Looking for the full reference table? See our complete drill bit size chart, or learn what size drill bit to use.