Calculating BPM with inputs
MATLAB/Octave, 58 56 55  bytes
Thanks @LuisMendo for -1 byte!
input('');tic;for k=1:7;input('');end;fix(48e3/toc)/100

You have to press enter 9 times. (Also works in Octave.)
Here you see it in action, left MATLAB, right Octave: