Spindle Speed Calculator

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Calculates the spindle speed (RPM) and feed rate for machining operations based on cutting speed, tool diameter, and desired feed per tooth.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Cutting Speed, Tool Diameter, Feed Per Tooth, and Number of Teeth in the units shown.

Step 2

Read Spindle Speed (RPM) and Feed Rate in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Cutting Speed: 300 feet/minute; Tool Diameter: 0.25 inches; Feed Per Tooth: 0.002 inches/tooth; Number of Teeth: 2

Spindle Speed (RPM): 4,584 RPM; Feed Rate: 18.34 inches/minute

Cutting Speed: 100 feet/minute; Tool Diameter: 0.75 inches; Feed Per Tooth: 0.004 inches/tooth; Number of Teeth: 4

Spindle Speed (RPM): 509 RPM; Feed Rate: 8.14 inches/minute

Cutting Speed: 500 feet/minute; Tool Diameter: 1 inches; Feed Per Tooth: 0.003 inches/tooth; Number of Teeth: 3

Spindle Speed (RPM): 1,910 RPM; Feed Rate: 17.19 inches/minute

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