How the calculation works

RPM = 3.82 × SFM ÷ diameter. Feed = RPM × flutes × chip load.

Example

100 SFM with a 0.5-inch four-flute tool at 0.002 IPT gives 764 RPM and 6.11 IPM.

When to use this calculator

Use it for milling, drilling, routing metals, and establishing conservative starting parameters.

Results are planning estimates. Verify critical dimensions, machine settings, material specifications, and local code requirements before work begins.