Converting WHP to Crank HP

[Speed_RaSiR]

What is an accurate way of converting this? Is there a calculation?

[GTS Jeff]

its different for every car cuz every car has different drivetrain losses

[VWhooligan]

some places/cars are 10%, others are 20% from waht I've heard, I just assume 15%.

so take your whp (200) and times it by 15% =

200*1.15= 230 hp

[Ben]

There is also alot more driveline loss in Automatics Versus Manuals.

Some Autos I have seen loose upwards of 30%

[hjr]

FWD generally seems to loose less than a RWD as well (no pesky drive shaft, only CV's)