Workshop Reference calculators & charts
General shop references: a four-way drill size converter for fractional, number, letter and metric drills, the drill point length for blind holes, and the Interactive Studio that puts every instrument on one screen. Use these when you need to translate between drill systems or check how deep a drilled point really goes.
All 3 Workshop Reference tools
4-Way Drill Bit Size Converter4-way drill bit size converter and comparative chart.Open Drill Point Length CalculatorCalculate twist drill and solid carbide drill point cone length) for 90°, 118°, 130°, 135°, and 140° angles, plus blind and through-hole Z-depths.Open Interactive Studio (all instruments)DRO studio with every instrument on one screen: 60 FPS CNC simulation, G-code and blueprint export.Open
Other drawers
Every result on these pages comes with its formula and the standard behind it. How the numbers are computed and checked is described in the calculation methodology.