Online Horsepower Calculators

Yes I understand what your saying, unfortunately with software its black and white, it will spit out its numbers no matter. All you need for an ET prediction is weight/hp. The gearing tyre size inputs do not affect ET as far as the software goes (although on track it will make all the difference), its not designed to tell you what gears to run, its there to give you the trap rpm that your motor will be turning in 3rd gear which is what it assumes will happen. For those that know how much and where their engine makes its peak power it is a useful tool in determining tyre height/g-ratio to keep the motor at its peak hp throughout the run. The torque your engine makes will give you your converter choice along with the gearing weight tyre hp etc. etc. for optimum 60ft and 1/4 performance.

Basically as I said before, a stock street car cannot use the calculator to any effect as you are not set up for the 1/4 mile. No amount of HP will enable you to run what the calc suggests unless you have the chassis (gears/tyres/converter/suspension) to propel the car to the 60ft times and therefore the ET it will spit out for a given hp/weight combo. I hope that makes things somewhat clearer for you.