meter per minute

Cutting speed is the one number that governs tool life, and it is quoted in metres per minute across most of the world and surface feet per minute in North America. The conversion is $1\ \mathrm{m/min} = 3.28084\ \mathrm{ft/min}$.

The distinction that matters is between cutting speed and spindle speed. Cutting speed is how fast the material passes the cutting edge; spindle speed is how fast the chuck turns. They differ by the workpiece circumference, so $N = V/(\pi D)$, and a tool catalogue that recommends 200 m/min is telling you about the edge, not the machine.

Tool life is brutally sensitive to it. Taylor's relation $VT^n = C$ has an exponent $n$ around 0.2 for high-speed steel, which means a twenty percent increase in cutting speed cuts tool life by more than half. That sensitivity is why speeds and feeds are worth calculating rather than guessing.