Warp is a logarithm of the speed of light; 10/warp=log speed/e?, so warp 10= 10/10 =log e/speed = 1; warp 1 = 10=log e/speed; speed=.0000000001*e
e is the speed of light,
speed is the speed of the subject, expressed as a fraction of the speed of light.
The only thing I'm not sure of is whether this is base 10, but I presume it is, since they select warp 10 to be e.
I thought the cube of the warp number was the light-speed-multiple - Warp 2 is eight times the speed of light, Warp 3 is 27 times, etc.