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.
Let our engineers find the right factory for your specs. 100% Quality Guaranteed.
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.
Continue with closely related tools from the machining calculator library.
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.
Before you commit to a spec, it helps to know what the market pays for it. These are real, publicly listed factory prices — not a quotation, and not a guess.
We source the tool families below direct from vetted Chinese factories, matched to the material and tolerance you just worked out. Every batch ships with its material certificate and dimensional record.
WORKED OUT YOUR SFM? SFM is where high-end and low-end carbide diverge, and the difference is not the price tag — it is the rod and coating inside.
Tell us the part material, lot size, and target price. We’ll match a verified China factory and return a quotation within 48 hours.