Feeds and Speeds Calculator

Spindle speed comes from cutting speed and tool diameter; feed rate comes from spindle speed, flutes and chip load. Three formulas, safer cuts, longer tool life.

Surface speed — see tool & material charts.
Material removed per flute per rev.

⚙️ Spindle RPM

Cutting speed ÷ tool circumference.

🛠 Feed rate

RPM × flutes × chip load.

📦 Metric / Imperial

m/min+mm or SFM+inches.

📈 MRR

Material removal rate for cycle time.

More manufacturing tools

Dial in every cut.

Conduit Size → Duct Size Amps to kW

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