i think the convertor program we use here would be far more accurate then a calculator in someones head based on the fact we use it to messure the GAS we suck up in different math mathods
wopps
307.6907HP = 412.62KW
btw, your calculator is wrong...
i have a converter program here that converts kw to hp, hp to kw, temperature, time, torque, volume, etc etc.