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Drill & Tap Speed Calculator
Calculate spindle speed and feed for drilling and rigid tapping.
Parameters
Results
RPM
10,696rev/minFeed
85.57IPMSurface speed
700SFMFeed/rev
0.0080in/revFormulas
RPM = SFM × 3.82 ÷ diameter
Drill feed = RPM × chip load × flutes
Tap feed = RPM ÷ TPI
About this tool
Gives starting RPM and feed for drilling and tapping in common materials from a drill size and material choice.
- Inputs
- Material
- Drill diameter
- Tool material (HSS or carbide) where listed
- Assumptions
- Standard-length twist drills with coolant
- Tapping speed estimated at roughly 40% of the HSS drilling speed
- Through-hole or shallow blind holes (depth under ~3× diameter)
- Sources
- Drill and tap manufacturer catalogs
- Machinery's Handbook drilling data
- Valid range
- Drill sizes 1/16–1 in (1.5–25 mm) in the listed materials.
- Limitations
- Deep holes, gundrilling, and peck strategies need reduced parameters
- No consideration of machine rigidity or thin-wall workpieces
- Rigid vs. floating tap holders change usable tapping speed
Values are starting points for planning — verify against your tooling and machine documentation before cutting. Report an issue with this tool →