This simulator will calculate a "power 78kg-standard" value, based on F. Portoleau's calculation method (©2013), and a performance threshold (© A. Vayer, the performance expert).
More details about these methods in the watt the fuck ? section.

 

Calculation parameters
Height (cm)
Cyclist weight (kg, dressed !)
Bike weight (kg)
Road condition
Wind (average, en km/h)
Exemple : No wind => 0. Low head wind => -1km/h. Strong head wind => -4km/h. Tail wind => 2km/h
Temperature (°C)
Posture on the bike
Aerodynamic equipment (aerobar, lenticular wheel, ...)
Drafting (%age)
Exemple : no drafting => 0. "usual" drafting => 2
 

Performance

Time h  m  s
Stage type
Total stage duration higher than 4 hours
Show me the calulcation details 
 

  Details on performance thresholds

The threshold depends on several information : the stage and last climb duration (no threshold if effort < 20 min), its difficulty, etc.
Here is the method used on this website:

Mountain stages > 4 hours:
> 450 W (78kg-standard) : MUTANT
> 430 W : MIRACULOUS
> 410 W : SUSPICIOUS
< 410 W : HUMAN
Single-col stages > 4 hours or time-trials:
> 465 W (78kg-standard) : MUTANT
> 445 W : MIRACULOUS
> 425 W : SUSPICIOUS
< 425 W : HUMAN

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