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Feeds and speeds calculator for CNC milling, metric and imperial

Featured October 9, 2026Facts checked October 9, 2026Independently reviewed

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Feeds and speeds calculator for CNC milling, metric and imperial presents itself as Feeds and speeds calculator for CNC milling, metric and imperial. UpPeek surfaced it for people exploring tools.

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Speeds and feeds formulas

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What you can do

Speeds and feeds formulas
The calculator above uses the standard milling formulas. You can also work them by hand.
Spindle speed: RPM = SFM × 3.82 ÷ D , where SFM is surface feet per minute and D is the tool diameter in inches. (3.82 is 12 ÷ π, rounded.)

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What stands out

Feed rate: IPM = RPM × chip load × flutes , where chip load is inches per tooth (IPT).
Surface speed from RPM: SFM = RPM × D ÷ 3.82 .
Spindle speed: RPM = Vc × 1000 ÷ (π × D) , where Vc is the cutting speed in metres per minute and D is the tool diameter in mm.

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Available on: Web

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Source: Official website ↗. Product details can change; verify them on the official source before purchasing.

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