Spindle Speed Calculator

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Spindle Speed Calculator

Calculate the required spindle speed (RPM) for machining operations. Uses the standard formula RPM = (SFM × 12) / (π × Diameter).

Operation Type *

Material *

Tool / Workpiece Diameter *

Cutter diameter for milling/drilling, or workpiece diameter for turning

Surface Speed (SFM) *

SFM

Surface feet per minute

Chip Load per Tooth (optional)

in/tooth

For milling operations

Number of Teeth / Flutes

teeth

Show Steps

⚠️

Spindle Speed

—

⚙️

Spindle Speed

—

RPM

📏

Surface Speed

—

SFM

📐

Diameter

—

📊

Feed Rate

—

in/min

📋

Calculation Breakdown

Step-by-step speed analysis

📖

Machining Formulas

Key speed and feed equations

⚙️ Machining Disclaimer: This calculator provides estimates for spindle speed and feed rate. Actual speeds depend on machine rigidity, tooling, coolant, and specific material conditions. Always consult tooling manufacturers' recommendations.