As far as I know, the Vbe junction is a diode, so the formula would be:
Ie = Is * exp(Vbe / n*Vt)
Ie - emitter current (approximately equal to collector current)
Is - in the order of 10^-14
Vbe - the Vbe voltage
n - can be between 1 and 2
Vt - approximately equal to 0.024 Volts
That the info from an electronics class, I didn't actually look for Is or n in the datasheet.
Usually, you would look at the Vbe vs Ic graph in the datasheet to know the operating point (aka Q point) of the transistor.
You should rely much on those values though, as it was said earlier, coz you'll get huge changes due to temperature, and the actual transistor (same part number, from the same manufacturer and the same batch will give totally different results).
If you're using it as an amplifier, make the feedback define the gain and the bias...