Convert spindle RPM and tool or workpiece diameter into surface speed in m/min and SFM. Use it to compare cutting data across metric and imperial tooling charts.
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Request a Proposal →Surface speed should be selected by material, tool substrate, coating, operation type, and coolant condition.
Surface speed is the speed of the cutting edge relative to the workpiece surface. It is commonly expressed as m/min or SFM.
No. RPM is spindle speed. SFM changes with diameter, so the same RPM produces different surface speeds on different tool or workpiece diameters.
Lower it for hard materials, poor coolant, long reach tools, unstable setups, interrupted cuts, or rapid edge wear.
Use this calculator to translate between spindle RPM and cutting speed so metric and imperial tooling charts can be compared correctly.
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Use the calculator freely. If the result points to a tooling or process problem, we can source the exact carbide tooling you need from vetted factories in China. Compare factory-direct pricing.