Example:
15 EW = 2.011533e+16 horsepower (550 ft·lbf/s)
1 EW = 1.341022e+15 horsepower (550 ft·lbf/s) | 1 horsepower (550 ft·lbf/s) = 7.456999e-16 EW
Conversion Steps:
15 × (1e+18 / 745.699871582) = 2.011533e+16