CNC Feeds & Speeds Calculator

Operation Type & Units

Select machining operation

🔄 MillingEndmill / Facemill

⚙️ TurningOD / ID / Facing

Units:

Milling Parameters

Enter cutting data

Cutting Speed (Vc) m/min

Tool Diameter (D) mm

Chip Load per Tooth (fz) mm/tooth

Number of Flutes (Z)

Axial Depth (ap) mm

Radial Depth (ae) mm

Material Factor (k)

CNC Machining Analysis Result

Milling · Metric

LIVE

Spindle Speed (n)
0
RPM

Feed Rate (Vf)

mm/min

Material Removal Rate

cm³/min

Cutting Power (Pc)

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Milling Formulas: n = (Vc × 1000) / (π × D) · Vf = n × fz × Z · MRR = (ap × ae × Vf) / 1000
Turning Formulas: n = (Vc × 1000) / (π × D) · Vf = n × fr · MRR = (doc × fr × Vc × 1000) / (π × D)
Power: Pc = (MRR × kc) / (60 × 1000) with efficiency factor

Proper cutting speeds and feed rates are critical for tool life, surface finish, and machining efficiency. This calculator helps machinists and CNC programmers quickly determine optimal RPM, feed rate, material removal rate (MRR), and required cutting power for both milling and turning operations.

Key Formulas: Spindle Speed (RPM), Feed Rate (IPM/mm/min), MRR (cubic inches/min or cm³/min), and Power (HP/kW).

— Vaibhav Dhokpande, Developer · TaskJunction