Drill Bit Size Converter

Enter the measurements or known size information below. Calcori compares them with a bounded reference set and returns the closest practical match.

Measured diameterUnit

Metric6.4 mm

Nearest 1/64 in1/4"

Nearest drillE · 6.35 mm

Reference conversion only; verify manufacturer or project specifications where tolerances matter.

METHOD

How it works

Result = closest supported reference from the entered measurements; verify the final product or engineering specification.

Note

Reference values for sizing. Manufacturer ranges, tolerances and standard variants can differ; verify the product datasheet before ordering.