FREE · CALCULATORS & CONVERTERS
Drill Speed Calculator.
Convert a cutting speed and a drill diameter into spindle speed in revolutions per minute.
Metric speed is metres per minute and diameter is millimetres. Inch speed is feet per minute. Presets are typical high-speed-steel starts. Local arithmetic only. This is a quantity or geometry estimate, not a code check and not a substitute for a licensed professional.
- Spindle speed
- 636.619772 rpm
RPM = surface speed in metres per minute × 1,000 / (π × diameter in millimetres). Presets are typical high-speed-steel starting speeds, not a chart for one cutter.
How to use Drill Speed Calculator
Choose metric or inch units, pick a starting speed or type your own, then enter the drill diameter.
How it works
Convert a cutting speed and a drill diameter into spindle speed in revolutions per minute. Metric speed is metres per minute and diameter is millimetres. Inch speed is feet per minute. Presets are typical high-speed-steel starts. Local arithmetic only. This is a quantity or geometry estimate, not a code check and not a substitute for a licensed professional.
Example
A 10 mm drill at 20 metres per minute.
Questions about Drill Speed Calculator
Is Drill Speed Calculator free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Metric speed is metres per minute and diameter is millimetres. Inch speed is feet per minute. Presets are typical high-speed-steel starts. Local arithmetic only. This is a quantity or geometry estimate, not a code check and not a substitute for a licensed professional. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.